ORIGINAL_ARTICLE
Multi layered finite element analysis of graded coatings in frictional rolling contact
A plain strain analysis of frictional rolling contact on an elastic graded coating is presented in this paper. Finite element method is applied to gain an understanding of the stresses and contact zone properties caused during rolling contact. The effects of friction, material stiffness ratio and coating thickness on stresses in contact zone and coating/substrate interface are studied. Shear modulus of softening and stiffening graded coatings change with exponential, power law and linear functions. The substrate is homogenous and the rigid cylindrical roller moves in a steady state condition with constant velocity. The coating is modeled in multi layers and a 2-D hard contact of rolling surfaces is considered. The analytical results verify the present method and show a good agreement. It is shown that thinner thicknesses have more effects on stresses and energy density, but these effects are not seen for thicknesses larger than a specific limit.
http://admt.iaumajlesi.ac.ir/article_534911_177b7b10b52059e8cad3ba34c5f1f414.pdf
2015-03-01T11:23:20
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1
12
Frictional Rolling Contact
Finite Element Method
Graded Coating
Geometrical Effects
R.
Jahedi
re.jahedi@gmail.com
true
1
Department of Mechanical and Aerospace Engineering,
Science and Research Branch,
Islamic Azad University, Tehran, Iran
Department of Mechanical and Aerospace Engineering,
Science and Research Branch,
Islamic Azad University, Tehran, Iran
Department of Mechanical and Aerospace Engineering,
Science and Research Branch,
Islamic Azad University, Tehran, Iran
AUTHOR
S.
Adibnazari
adibnazar.s@gmail.com
true
2
Department of Mechanical and Aerospace Engineering,
Science and Research Branch,
Islamic Azad University, Tehran, Iran
Department of Mechanical and Aerospace Engineering,
Science and Research Branch,
Islamic Azad University, Tehran, Iran
Department of Mechanical and Aerospace Engineering,
Science and Research Branch,
Islamic Azad University, Tehran, Iran
LEAD_AUTHOR
[1] Dahm, K. L., “Thin coatings with graded elastic properties”, Proc IMechE Part J: J. Engineering Tribology, Vol. 222, No. 3, 2008, pp. 249-259.
1
[2] Dag, S., Erdogan, F., “A surface crack in a graded medium loaded by a sliding rigid stamp”, Eng. Fract. Mech., Vol. 69, No. 14-16, 2002, pp. 1729-1751.
2
[3] Guler, M. A., Erdogan, F., “Contact mechanics of graded coatings”, Int. J. Solids Struct., Vol. 41, No. 14, 2004, pp. 3865-3889.
3
[4] Ding, S. H., Li, X., “Anti-plane problem of periodic interface cracks in a functionally graded coating-substrate structure”, Int. J. Fract., Vol. 153, No. 1, 2008, pp. 53-62.
4
[5] Jin, Z. H., “Effect of thermal property gradients on the edge cracking in a functionally graded coating”, Surf. Coat. Technol., Vol. 179, No. 2, 2004, pp. 210-214.
5
[6] Nami, M. R., Eskandari, H., “Three-dimensional investigation of stress intensity factors in a cracked cylinder made of functionally graded materials”, Mech. Based Des. Struct. Mach., Vol. 40, No. 2, 2012, pp. 206-217.
6
[7] Alwahdi, F., Franklin, F. J. and Kapoor, A., “The effect of partial slip on the wear rate of rails”, Wear, Vol. 258, No. 7, 2005, pp. 1031-1037.
7
[8] Vasica, G., Franklin, F. J. and Fletcher, D. I., “Influence of partial slip and direction of traction on wear rate in wheel-rail contact”, Wear, Vol. 270, No. 3, 2011, pp. 163-171.
8
[9] Suresh, S., Olsson, M. and Giannakopoulos, A. E., “Engineering the resistance to sliding contact damage through controlled gradients in elastic properties at contact surfaces”, Acta Mater, Vol. 47, No. 14, 1999, pp. 3915-3926.
9
[10] Ke, L., Wang, Y., “Two dimensional contact mechanics of functionally graded materials with arbitrary spatial variations of material properties”, Int. J. Solids Struct., Vol. 43, No. 18, 2006, pp. 5779-5798.
10
[11] Ke, L., Wang, Y., “Two dimensional sliding frictional contact of functionally graded materials”, Eur. J. Mech., Vol. 26, No. 1, 2007, pp. 171-188.
11
[12] Liu, T., Xing, Y., “Analysis of graded coatings for resistance to contact deformation and damage based on a new multi-layer model,” Int. J. Mech. Sci., Vol. 81, 2014, pp. 158-164.
12
[13] Banichuk, N. V., Ivanova, S. and Makeev, E. V., “Finding of rigid punch shape and optimal contact pressure distribution”, Mech Based Des. Struct. Mach., Vol. 38, 2010, pp. 417-429.
13
[14] Guler, M. A., Erdogan, F., “Contact mechanics of two deformable elastic solids with graded coatings”, Mech. Mater., Vol. 38, No. 7, 2006, pp. 633-647.
14
[15] Singha, M. K., Prakash, T., “Finite element analysis of functionally graded plates under transverse load”, Finite Elem. Anal. Des., Vol. 47, No. 4, 2011, pp. 453-460.
15
[16] Rohwer, K., Rolfes, R., “Calculating 3D stresses in layered composite plates and shells”, Mech. Compos. Mater., Vol. 34, No. 4, 1998, pp. 355-362.
16
[17] Birman, V., Byrd, L. W., “Modeling and analysis of functionally graded materials and structures”, Appl. Mech. Rev., Vol. 60, No. 5, 2007, pp. 197-216.
17
[18] Cho, R., Ha, D. Y., “Averaging and finite element discretization approaches in the numerical analysis of functionally graded materials”, J. Mater. Sci. Technol., Vol. 302, No. 2, 2000, pp. 287-296.
18
[19] Ray, M. C., Sachade, H. M., “Finite element analysis of smart functionally graded plates”, Int. J. Solids Struct., Vol. 43, No. 18, 2006, pp. 5468-5484.
19
[20] Rabczuk, T., Areias, PMA., “A mesh free thin shell for arbitrary evolving cracks based on an external enrichment”, Computer Modeling Eng. Sci., Vol. 16, No. 1, 2006, pp. 115-130.
20
[21] Diao, D., Kandori, A., “Finite element analysis of the effect of interfacial roughness and adhesion strength on the local delamination of hard coating under sliding contact”, Tribol. Int., Vol. 39, No. 9, 2006, pp. 849-855.
21
[22] Dag, S., Guler, M. A., “Sliding frictional contact between a rigid punch and a laterally graded elastic medium”, Int. J. Solids Struct., Vol. 46, No. 22, 2009, pp. 4038-4053.
22
[23] Adibnazari, S., Khajehtourian, R. and Tashi, S., “The sliding frictional contact problem in two dimensional graded materials loaded by a flat stamp”, Adv. Mat. Res., Vol. 463-464, 2012, pp. 336-342.
23
[24] Guler, M. A., Adibnazari, S. and Alinia, Y., “Tractive rolling contact mechanics of graded coatings”, Int. J. Solids Struct., Vol. 49, No. 6, 2012, pp. 929-945.
24
[25] Alinia, Y., Guler, M. A. and Adibnazari, S., “On the contact mechanics of a rolling cylinder on a graded coating. Part 1: analytical formulation”, Mech. Mater., Vol. 68, 2014, pp. 207-216.
25
[26] Guler, M. A., Alinia, Y. and Adibnazari, S., “On the contact mechanics of a rolling cylinder on a graded coating. Part 2: numerical results”, Mech. Mater., Vol. 66, 2013, pp. 134-159.
26
[27] Guler, M. A., Alinia, Y. and Adibnazari, S., “On the rolling contact problem of two elastic solids with graded coatings”, Int. J. Mech. Sci., Vol. 64, No. 1, 2012, pp. 62-81.
27
[28] Alinia, Y., Guler, M. A. and Adibnazari, S., “The effect of material property grading on the rolling contact stress field”, Mech. Res. Commun., Vol. 55, 2014, pp. 45-52.
28
[29] Hills, D. A., Nowell, D. and Sackfield, A., “Mechanics of Elastic Contact”, 1st ed., Oxford Press, Butterworth-Heinemann, 1993, chap. 2.
29
[30] Peixoto, D. F. C., Castro, P. M. de., “Nonlinear analysis of the wheel/rail contact”, Ph.D. Dissertation, Mechanical Eng. Dept., University of Porto, Portugal, 2011.
30
[31] Yang, J., Ke, L., “Two-dimensional contact problem for a coating– graded layer– substrate structure under a rigid cylindrical punch”, Int. J. Mech. Sci., Vol. 50, No. 6, 2008, pp. 985-994.
31
[32] Halme, J., Andersson, P., “Rolling contact fatigue and wear fundamentals for rolling bearing diagnostics - state of the art”, Proc IMechE Part J: J Engineering Tribology, Vol. 224, 2010, pp. 377-393.
32
ORIGINAL_ARTICLE
Statistical Analysis and Optimization of Factors Affecting the Spring-back Phenomenon in UVaSPIF Process Using Response Surface Methodology
Ultrasonic Vibration assisted Single Point Incremental Forming (UVaSPIF) process is an attractive and adaptive method in which a sheet metal is gradually and locally formed by a vibrating hemispherical-head tool. The ultrasonic excitation of forming tool reduces the average of vertical component of forming force and spring-back rate of the formed sample. The spring-back phenomenon is one of the most important geometrical errors in SPIF process, which appear in the formed sample after the process execution. In the present article, a statistical analysis and optimization of effective factors on this phenomenon is performed in the UVaSPIF process based on DOE (Design of Experiments) principles. For this purpose, RSM (Response Surface Methodology) is selected as the experiment design technique. The controllable factors such as vertical step size, sheet thickness, tool diameter, wall inclination angle, and feed rate is specified as input variables of the process. The obtained results from ANOVA (Analysis of Variance) and regression analysis of experimental data, confirm the accuracy of mathematical model. Furthermore, it is shown that the linear, quadratic, and interactional terms of the variables are effective on the spring-back phenomenon. To optimize the spring-back phenomenon, the finest conditions of the experiment are determined using desirability method, and statistical optimization is subsequently verified by conducting the confirmation test.
http://admt.iaumajlesi.ac.ir/article_534912_362af0ff857de99c4e36ec0ec8ca1459.pdf
2015-03-01T11:23:20
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13
23
RSM
Single Point Incremental Forming
Spring-back
Ultrasonic Vibration
M.
Vahdati
m_vahdaty@yahoo.com
true
1
Department of Mechanical Engineering,
University of Tehran, Iran
Department of Mechanical Engineering,
University of Tehran, Iran
Department of Mechanical Engineering,
University of Tehran, Iran
LEAD_AUTHOR
R. A.
Mahdavinejad
mahdavin@ut.ac.ir
true
2
Department of Mechanical Engineering,
University of Tehran, Iran
Department of Mechanical Engineering,
University of Tehran, Iran
Department of Mechanical Engineering,
University of Tehran, Iran
AUTHOR
S.
Amini
amini.s@kashanu.ac.ir
true
3
Department of Mechanical Engineering,
University of Kashan, Iran
Department of Mechanical Engineering,
University of Kashan, Iran
Department of Mechanical Engineering,
University of Kashan, Iran
AUTHOR
[1] Leszak, E., U.S. Patent Application for a “Apparatus and process for incremental dieless forming”, Docket No. 3342051A, filed 1967.
1
[2] Kitazawa, K., Wakabayashi, A., Murata, K., and Yaejima, K., “Metal-flow phenomena in computerized numerically controlled incremental stretch-expanding of aluminium sheets”, Journal of Japan Institute of Light Metals, Vol. 46, 1996, pp. 65-70.
2
[3] Petek, A., Jurisevic, B., Kuzman, K., and Junkar, M., “Comparison of alternative approaches of single point incremental forming processes”, Journal of Materials Processing Technology, Vol. 209, 2009, pp. 1810-1815.
3
[4] Duflou, J., Tunckol, Y., Szekeres, A., and Vanherck, P., “Experimental study on force measurements for single point incremental forming”, Journal of Materials Processing Technology, Vol. 189, 2007, pp. 65-72.
4
[5] Jeswiet, J., Micari, F., Hirt, G., Bramley, A., Duflou, J., and Allwood, J., “Asymmetric single point incremental forming of sheet metal”, CIRP Annals - Manufacturing Technology, Vol. 54, No. 2, 2005, pp. 623-649.
5
[6] Thibaud, S., BenHmida, R., Richard, F., and Malécot, P., “A fully parametric toolbox for the simulation of single point incremental sheet forming process: Numerical feasibility and experimental validation”, Simulation Modelling Practice and Theory, Vol. 29, 2012, pp. 32-43.
6
[7] Micari, F., Ambrogio, G., and Filice, L., “Shape and dimensional accuracy in Single Point Incremental Forming: State of the art and future trends”, Journal of Materials Processing Technology, Vol. 191, 2007, pp. 390-395.
7
[8] Ambrogio, G., Costantino, I., De Napoli, L., Filice, L., and Muzzupappa, M., “Influence of some relevant process parameters on the dimensional accuracy in incremental forming: a numerical and experimental investigation”, Journal of Materials Processing Technology, Vol. 153C/154C, 2004, pp. 501-507.
8
[9] Allwood, J. M., King, G. P. F., and Duflou, J., “A structured search for applications of the incremental sheet-forming process by product segmentation”, Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, Vol. 219, No. 2, 2005, pp. 239-244.
9
[10] Ambrogio, G., Cozza, V., Filice, L., and Micari, F., “An analytical model for improving precision in single point incremental forming”, Journal of Materials Processing Technology, Vol. 191, 2007, pp. 92-95.
10
[11] Meier, H., Buff, B., Laurischkat, R., and Smukala, V., “Increasing the part accuracy in dieless robot-based incremental sheet metal forming”, CIRP Annals - Manufacturing Technology, Vol. 58, 2009, pp. 233-238.
11
[12] Allwood, J. M., Braun, D., and Music, O., “The effect of partially cut-out blanks on geometric accuracy in incremental sheet Forming”, Journal of Materials Processing Technology, Vol. 210, 2010, pp. 1501-1510.
12
[13] Siegert, K., Ulmer, J., “Superimposing ultrasonic waves on the dies in tube and wire drawing”, Journal of Engineering Materials and Technology, Vol. 123, 2001, pp. 517-523.
13
[14] Hung, J.-C., Hung, C., “The influence of ultrasonic-vibration on hot upsetting of aluminum alloy”, Ultrasonics, No. 43, 2005, pp. 692-698.
14
[15] Tolga Bozdana, A., Gindy, N. N. Z., and Li, H., “Deep cold rolling with ultrasonic vibrations – a new mechanical surface enhancement technique”, International Journal of Machine Tools and Manufacture, No. 45, 2005, pp. 713-718.
15
[16] Vahdati, M., Mahdavinejad, R.A., Amini, S., Abdullah, A., and Abrinia, K., “Design and manufacture of vibratory forming tool to develop “ultrasonic vibration assisted incremental sheet metal forming” process”, Modares Mechanical Engineering, Vol. 14, No. 11, 2014, pp. 68-76 (In Persian).
16
[17] Vahdati, M., Mahdavinejad, R.A., and Amini, S., “Investigation of the Ultrasonic Vibration Effect in Incremental Sheet Metal Forming (ISMF) Process”, Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture, (to be published).
17
[18] Vahdati, M., Sedighi, M., and Khoshkish, H., “An analytical model to reduce spring back in Incremental Sheet Metal Forming (ISMF) process”, International Journal of Advanced Materials Research (AMR), Vols. 83-86, 2010, pp. 1113-1120.
18
[19] Montgomery, D. C., “Design and Analysis of Experiments”, 3rd ed., New York, John Wiley & Sons, 1991.
19
[20] Khuri, A. I., Cornell, J.A., “Response Surfaces Design and Analysis”, 2nd ed., New York, MarcelDekker, 1996.
20
[21] Myers, R. H., Montgomery, D. C., “Response Surface Methodology: Process and Product Optimization Using Designed Experiments”, 2nd ed., New York, John Wiley & Sons, 2002.
21
[22] Minitab Software Package, Ver. 16, http://www.minitab.com.
22
[23] DIN 51524, Part 2.
23
[24] CIMCO Software Package, Ver. 5, http://www.cimco.com.
24
[25] Myers, R. H., Montgomery, D. C., and Anderson-Cook, C. M., “Response Surface Methodology: Process and Product Optimization Using Designed Experiments”, 3rd ed., New York, John Wiley & Sons, 2009.
25
ORIGINAL_ARTICLE
Vibration Analysis of a Multi-disk, Bearing and Mass Unbalance Rotor Using Assumed Modes Method
In this paper, a simple and efficient method for modeling and solving the equations of a rotor with any number of disks, bearings and mass unbalances is presented using the assumed modes method. This model consists of a continuous shaft, arbitrary number of mass unbalances in any axial location and phase angle, and any number of rigid disks and bearings. This arrangement is extensively used in diverse applications. In this study, final governing differential equations are not derived because the assumed modes method is directly inserted to solving process. Some examples in both cases of free and forced vibration are performed. The results show the accuracy of this modeling and the ability of it to predicting the vibration behavior of the rotor in a complex combination of shaft, disk and bearing. This study also shows that the present approach can give the results as accurate as the most popular approach, i.e. the Finite Element Method.
http://admt.iaumajlesi.ac.ir/article_534913_aa0c5d9fb24ccfd7c68a7bfa290915ee.pdf
2015-03-01T11:23:20
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25
33
Assumed Modes Method
Rotor-Bearing
Vibration analysis
R.
Norouzi
norouzi.rouhallah@yahoo.com
true
1
Department of Mechanical Engineering,
University of Yazd, Yazd, Iran
Department of Mechanical Engineering,
University of Yazd, Yazd, Iran
Department of Mechanical Engineering,
University of Yazd, Yazd, Iran
LEAD_AUTHOR
M.
Rafeeyan
rafeeyan@yazd.ac.ir
true
2
Department of Mechanical Engineering,
University of Yazd, Yazd, Iran
Department of Mechanical Engineering,
University of Yazd, Yazd, Iran
Department of Mechanical Engineering,
University of Yazd, Yazd, Iran
AUTHOR
H.
Dalayeli
dal.hos.2011@gmail.com
true
3
Department of Mechanical Engineering,
Malek Ashtar University of Technology, Esfahan, Iran
Department of Mechanical Engineering,
Malek Ashtar University of Technology, Esfahan, Iran
Department of Mechanical Engineering,
Malek Ashtar University of Technology, Esfahan, Iran
AUTHOR
[1] Musznynska, M., “Rotordynamics”, CRC Press, Taylor & Francis Group, LLC, 2005, pp. 1-30.
1
[2] Katz, R., “The Dynamic Response of a Rotating Shaft Subject to an Axially Moving and Rotating Load”, Journal of Sound and Vibration, Vol. 246, No. 5, 2001, pp. 757-775.
2
[3] Chasalevris, A. C., “Vibration Analysis of Nonlinear-Dynamic Rotor-Bearing Systems and Defect Detection”. PhD Dissertation, University of Patras, 2009.
3
[4] Jun, O. S., Kim, J. O., “Free Bending Vibration of a Multi-Step Rotor”, Journal of Sound and Vibration, Vol. 224, No. 4, 1999, pp. 625-642.
4
[5] Shabaneh, N. H., Jean, W. Zu., “Dynamic Analysis of Rotor-Shaft Systems with Viscoelastically Supported Bearings”, Mechanism and Machine Theory, Vol. 35, 2000, pp. 1313-1330.
5
[6] Kalita, M., Kakoty, S. K., “Analysis of Whirl Speeds for Rotor-Bearing Systems Supported on Fluid Film Bearing”, Mechanical Systems and Signal Processing, Vol. 18, 2004, pp. 1369-1380.
6
[7] Khanlo, H. M., Ghayour, M., and Ziaei-Rad, S., “Chaotic Vibration Analysis of Rotating, Flexible, Continuous Shaft-Disc System with a Rub-Impact Between the Disc and the Stator”, Commun Nonlinear Sci Numer Simulat, Vol. 16, 2011, pp. 566-582.
7
[8] Tiwari, R., “A Brief History and State of the Art of Rotordynamics”, Department of Mechanical Engineering, Indian Institute of Technology Guwahati, 2008, pp. 7-30.
8
[9] Lee, W., Jei, Y. G., “Modal Analysis of Continuous Rotor-Bearing Systems”, Journal of Sound and Vibration, Vol. 126, No. 2, 1988, pp. 345-361.
9
[10] Oncescu, F., Lakis, A. A., and Ostiguy, G., “Investigation of the Stability and Steady State Response of Asymmetric Rotors, Using Finite Element Formulation”, Journal of Sound and Vibration, Vol. 245, No. 2, 2001, pp. 303-328.
10
[11] Xiang, J., Chen, D., Chen, X., and He, Zh., “A Novel Wavelet-Based Finite Element Method for the Analysis of Rotor-Bearing Systems”, Finite Elements in Analysis and Design, Vol. 45, 2009, pp. 908-916.
11
[12] Shad, M. R., “Modelling and Analysis of Nonlinear Dynamic Behavior of Rotors”, PhD Dissertation, University of Toulouse, 2011.
12
[13] Atepor, L., “Vibration Analysis and Intelligent Control of Flexible Rotor Systems Using Smart Materials”, PhD Dissertation, University of Glasgow, 2008.
13
[14] Choi, L., Park, J. M., “Finite Element Analysis of Rotor Bearing Systems Using a Modal Transformation Matrix”, Journal of Sound and Vibration, Vol. 111, No. 3, 1986, pp. 441-456.
14
[15] Rao, S., “Vibration of Continuous Systems”, John Wiley & Sons, 2007, pp. 661-673.
15
[16] Srikrishnanivas, S., “Rotor Dynamic Analysis of RM12 Jet Engine Rotor Using Ansys”, Master’s Degree Thesis, Blekinge Institute of Technology, Karlskrona, Sweden, 2012.
16
[17] Das, A. S., and Dutt, J. K., “Reduced Model of a Rotor-Shaft System Using Modified SEREP”, Mechanics Re-search Communications, Vol. 35, 2008, pp. 398-407.
17
ORIGINAL_ARTICLE
Optimization of the Forging Process of a Gas Turbine Blade using the Finite Element Analysis and Response Surface Method
Forging of gas turbine blades needs a close control of the process parameters. These parameters require a suitable optimization method to achieve the best process conditions. This paper presents a hybrid method for the optimization of the forging process of an aerofoil blade. Forging process of the aerofoil blade was simulated using 3-dimentional finite element method. Preform shape and die parting-line angle are optimized in order to minimize the volume of the unfilled die cavity, material waste, and forging forces. The overall optimization scheme used in this research work includes a multi-objective approach that is a combination of response surface and finite element methods. The results show that the proposed optimization approach accrued to decrease the flash volume and the forging force of the aerofoil forging process. Therefore the proposed algorithm is a suitable method for the optimization of the gas turbine blade forging processes.
http://admt.iaumajlesi.ac.ir/article_534914_378b9396f5f612f27479c13f580815e8.pdf
2015-03-01T11:23:20
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35
44
Blade
Finite Element
forging
Optimization
Response Surface
V.
Alimirzaloo
v.alimirzaloo@urmia.ac.ir
true
1
Department of Engineering,
University of Urmia, Iran
Department of Engineering,
University of Urmia, Iran
Department of Engineering,
University of Urmia, Iran
LEAD_AUTHOR
F. R.
Biglari
biglari@aut.ac.ir
true
2
Department of mechanical Engineering,
Amirkabir University of Technology, Iran
Department of mechanical Engineering,
Amirkabir University of Technology, Iran
Department of mechanical Engineering,
Amirkabir University of Technology, Iran
AUTHOR
[1] Hu, Z.M. Dean, T. A., “Aspects of forging of titanium alloys and the production of blade forms”, J. Mat. Proc. tech. Vol. 111, 2001, pp. 10-19.
1
[2] Zhao, G., Wang, G. and Grandhi, R. V., “Die cavity design of near flashless forging process using FEM-based backward simulation”, Journal of Materials Processing Technology, Vol. 121, 2002, pp. 173-181.
2
[3] Zhao, G., Ma, X., Zhao, X. and Grandhi, R.V., () “Studies on optimization of metal forming processes using sensitivity analysis methods”, J. Mat. Proc. tech. Vol. 147, 2004, pp. 217-228.
3
[4] Castro, C. F., António, C. A. C. and Sousa, L. C., “Optimisation of shape and process parameters in metal forging using genetic algorithms”, J. Mat. Proc. Tech. Vol. 146, 2004, pp. 356-364.
4
[5] Lu, X. Balendra, R., “Tempreture related errors on aerofoil section of turbine blade”, J. Mat. Proc. Tech. Vol. 115, 2001, pp. 240-244.
5
[6] Lu, B., Ou, H., Armstrong, C. G. and Rennie, A., “3D die Shape optimisation for net-shape forging of aerofoil blades”, Materials and Design, doi: 10.1016/j.matdes.2008.10.007.
6
[7] Kang, B. S., Kim, N. and Kobayashi, S., “Computer-aided preform design in forging of an airfoil section blade”, Int. J. Mach. Tools Manufact. Vol. 30, No. 1. 1990, pp. 43-52.
7
[8] Tao, G., He, Y. and Yuli, L., “Influence of dynamic boundary conditions on perform design for deformation uniformity in backward simulation”, Journal of materials processing technology, Vol. 197, 2008, pp. 255-260.
8
[9] Tao, G., He, Y. and Le, L. Y., “Backward tracing simulation of precision forging process for blade based on 3D FEM”, trans. nonferrous met. Soc. China, Vol. 16, 2006, pp. 639-644.
9
[10] Deform3D. V5, manual help, 2004.
10
[11] Montgomery, D.C., “Design and analysis of experiments”, J. Wiley & Sons, New York, 2005.
11
[12] Myers, R. H. Montgomery, D. C., “Response Surface Methodology,” J. Wiley & Sons Interscience Publication, New York, 2002.
12
[13] Shokuhfar, A., Khalili, S. M. R., Ashenai, Ghasemi, Malekzadeh, F., K. and Raissi, S., “Analysis and optimization of smart hybrid composite plates subjected to low-velocity impact using the response surface methodology”, Thin-Walled Structures , Vol. 46, 2008, pp. 1204-1212.
13
[14] Amini, H., Younesi, M. and Bahramifar, N., “statistical modeling and optimization of the cadmium biosorption process in an aqueous solution using Aspergillus niger”, Colloids and Surfaces A: Physicochem. Eng. Aspects, Vol. 337, 2009, pp. 67-73.
14
[15] Yalcinkaya, Ö. Mirac Bayhan, G., “Modelling and optimization of average travel time for a metro line by simulation and response surface methodology”, European Journal of Operational Research, Vol. 196 2009, pp. 225-233.
15
[16] Kolahdoozan, M., Azimifar, F., and Rismani Yazdi, S., “Finite Element Investigation and Optimization of Tool Wear in Drilling Process of Difficult to-Cut Nickel-Based Superalloy using Response Surface Methodology”, Int J Advanced Design and Manufacturing Technology, Vol. 7, No. 2, 2014, pp. 67-76.
16
[17] Lin, J. F. Chou, C. C., “The response surface method and the analysis of mild oxidational wear”, Tribology International, Vol. 35, 2002, pp. 771-785.
17
[18] Alimirzaloo, V., Biglari, F. R., and Sadeghi, M. H., “Numerical and Experimental Investigation of Preform Design for Hot Forging of Aerofoil Blade”, J. Engineering Manufacture, Vol. 225, No. 7, 2011, pp. 1129-1139.
18
[19] Minitab software, V15, user’s guide, technical manual, 2008.
19
ORIGINAL_ARTICLE
Modal and Aeroelastic Analysis of A High-Aspect-Ratio Wing with Large Deflection Capability
This paper describes a modified structural dynamics model for aeroelastic analysis of high-aspect-ratio wings undergoing large deformation behavior. To gain this aim, a moderate deflection beam model is modified with some important large deflection terms and then coupled with a state space unsteady aerodynamics model. Finite element method is used to discretize the equations of motion. A dynamic perturbation equation about a nonlinear static equilibrium is applied to determine the flutter boundary. The obtained results show good agreement in comparison with the other existing data such as high-altitude long-endurance (HALE) wing and Goland wing. It is found that the present aeroelastic tool have a good agreement in comparison with valid researches and also considering the effect of the geometric structural nonlinearity and higher order nonlinear terms on the flutter boundary determination is very significant.
http://admt.iaumajlesi.ac.ir/article_534915_1b27d7674d1a0bf8429c62ae18632df5.pdf
2015-03-01T11:23:20
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45
54
FEM
Jone's Approximate Unsteady Aerodynamics
Large Deflection
Wing Aeroelastic Stability
R.
Koohi
koohi@iaukhsh.ac.ir
true
1
Department of, Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Department of, Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
Department of, Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
LEAD_AUTHOR
H.
Shahverdi
h_shahverdi@aut.ac.ir
true
2
Department of Aerospace Engineering and Center of Excellence in Computational Aerospace, Amirkabir University of Technology, Tehran, Iran
Department of Aerospace Engineering and Center of Excellence in Computational Aerospace, Amirkabir University of Technology, Tehran, Iran
Department of Aerospace Engineering and Center of Excellence in Computational Aerospace, Amirkabir University of Technology, Tehran, Iran
AUTHOR
H.
Haddadpour
haddadpour@sharif.edu
true
3
Department of Aerospace Engineering,
Sharif University of Technology, Tehran, Iran
Department of Aerospace Engineering,
Sharif University of Technology, Tehran, Iran
Department of Aerospace Engineering,
Sharif University of Technology, Tehran, Iran
AUTHOR
[1] Hodges, D. H., Dowell, E., “Nonlinear Equations of Motion for the Elastic Bending and Torsion of Twisted Non uniform Rotor Blades”, NASA TN D-7818, 1974.
1
[2] Dowell, E., Traybar, J., and Hodges, D. H., “An Experimental-Theoretical Correlation Study of Nonlinear Bending and Torsion Deformations of a Cantilever beam”, Journal of Sound and Vibration, Vol. 50, 1977, pp. 533-544.
2
[3] Hodges, D. H., Crespo da Silva, M., and Peters, D., “Nonlinear Effects in the Static and Dynamic Behavior of Beams and Rotor Blades”, Vertica, Vol. 12, No. 3, 1988, pp. 243-256.
3
[4] Rosen, A., Freidmann, P. P., “The Nonlinear Behavior of Elastic Slender Straight Beams Undergoing Small Strains and Moderate Rotations”, Journal of Applied Mechanics, Vol. 46, 1979, pp. 161-168.
4
[5] Crespo da Silva, M., Glynn, C., “Nonlinear Flexural-Flexural-Torsional Dynamics of Inextensional Beams-I. Equations of Motions”, Journal of Structural Mechanics, Vol. 6, No. 4, 1978, pp. 437-448.
5
[6] Crespo da Silva, M., Glynn, C., “Nonlinear Flexural-Flexural-Torsional Dynamics of Inextensional Beams-I. Forced Motions”, Journal of Structural Mechanics, Vol. 6, No. 4, 1978, pp. 449-461.
6
[7] Pai, P., Nayfeh, A., “Three-Dimensional Nonlinear Vibrations of Composite Beams-I. Equations of Motion”, Nonlinear Dynamics, Vol. 1, 1990, pp. 477-502.
7
[8] Hodges, D. H., “A Mixed Variational Formulation Based on Exact Intrinsic Equations for Dynamics of Moving Beams”, International Journal of Solids and Structures, Vol. 26, No. 11, 1990, pp. 1253-1273.
8
[9] Tang, D., Dowell, E., “Experimental and Theoretical Study on Aeroelastic Response of High-Aspect-Ratio Wings”, AIAA Journal, Vol. 39, No. 8, 2001, pp. 1430-1441.
9
[10] Tang, D., Dowell, E., “Effects of Geometric Structural Nonlinearity on Flutter and Limit Cycle Oscillations of High-Aspect-Ratio Wings”, J Fluid Structure, Vol. 19, 2004, pp. 291-306.
10
[11] Patil, M. J., Hodges D. H., and Cesnik, C. E. S., “Nonlinear Aeroelasticity and Flight Dynamics of High-Altitude, Long-Endurance Aircraft”, Journal of Aircraft, Vol. 38, No. 1, 2001, pp. 88-94.
11
[12] Patil, M. J., Hodges, D. H., and Cesnik, C. E. S., “Nonlinear Aeroelastic Analysis of Complete Aircraft in Subsonic Flow”, Journal of Aircraft, Vol. 37, No. 5, 2000, pp. 753-760.
12
[13] Patil, M. J., Hodges, D. H., “Limit-Cycle Oscillations in High-Aspect-Ratio Wings”, J Fluids Structure, Vol. 15, 2001, pp. 107-132.
13
[14] Yuan, K. A., Friedmann, P. P., “Aeroelasticity and Structural Optimization of Composite Helicopter Rotor Blades with Swept Tips”, NASA CR 4665, 1995.
14
[15] Yuan, K. A., Friedmann, P. P., “Structural Optimization for Vibratory Loads Reduction of Composite Helicopter Rotor Blades with Advanced Geometry Tips”, Journal of the American Helicopter Society, Vol. 43, No. 3, 1998, pp. 246-256.
15
[16] Friedmann, P. P., Glaz, B., and Palacios, R., “A Moderate Deflection Composite Helicopter Rotor Blade Model with an Improved Cross-Sectional Analysis”, International Journal of Solids and Structures, Vol. 46, 2009, pp. 2186-2200.
16
[17] Hodges, D. H., “Nonlinear Composite Beam Theory”, AIAA, Reston, VA, 2006.
17
[18] Hodges, D. H., Yu, W., “A Rigorous, Engineer-Friendly Approach for Modeling Realistic, Composite Rotor Blades”, Wind Energy, Vol. 10, 2007, pp. 179-193.
18
[19] Murugan, S., Ganguli, R., and Harursampath, D., “Effects of Structural Uncertainty on Aeroelastic Response of Composite Helicopter Rotor”, 48th AIAA/ASME/ASCE/AHS/ACS Structures, Structural Dynamics and Materials Conference, Honolulu, HI, AIAA Paper 2298, 2007, pp. 1-18.
19
[20] Patil, M. J, Hodges, D. H., “On the Importance of Aerodynamic and Structural Geometrical Nonlinearities in Aeroelastic Behavior of High-Aspect-Ratio Wings”, Journal of Fluids and Structures, Vol. 19, 2004, pp. 905-915.
20
[21] Librescu, L., Chiocchia, G., and Marzocca, P., “Implications of Cubic Physical/Aerodynamic Non-linearities on the Character of the Flutter Instability Boundary”, International Journal of Non-linear Mechanics, Vol. 38, 2003, pp. 173-199.
21
[22] Ghadiri, B., Razi, M., “Limite Cycle Oscillations of Rectangular Cantilever Wings Containing Cubic Nonlinearity in an Incompressible Flow”, Journal of solid and structures, Vol. 23, 2007, pp. 665-680.
22
[23] Hodges, D. H., “Nonlinear Equations for Dynamics of Pretwisted Beams Undergoing Small Strains and Large Rotations”, NASA TP 2470, 1985.
23
[24] Razavi Kermanshahi, M., Lotfi Neyestanak, A. A., “Exact Vibration and Buckling Solution of Levy Type Initially Stressed Rectangular Thin Plates”, Int J Advanced Design and Manufacturing Technology, Vol. 6, No. 4, 2013, pp. 65-73.
24
[25] Karbaschi, K., Hasanzadeh, H., “Numerical Analysis of Plate’s Vibration Behavior with Non-linear Edge under Various Boundary Conditions”, Int J Advanced Design and Manufacturing Technology, Vol. 1, No. 2, 2008, pp. 52-65.
25
[26] Kargarnovin, M. H., Karbaschi, K., and Hasanzadeh, H., “Numerical Study of Increasing Error Order in Finite Difference Method Used for Analyzing the Rectangular Isotropic Plate's Vibration Behavior”, Int J Advanced Design and Manufacturing Technology, Vol. 1, No. 2, 2008, pp. 1-9.
26
[27] Greenberg, J. M., “Airfoil in Sinusoidal Motion in a Pulsating Stream”, NACA TN 1326, 1947.
27
[28] Peters, D. A., Cao, W. M., “Finite State Induced Flow Models Part I: Two Dimensional Thin Airfoil”, Journal of Aircraft, Vol. 32, No. 2, 1995, pp. 313-322.
28
[29] Patil, M. J. “Aeroelastic Tailoring of Composite Box Beams”, In Proceedings of the 35th Aerospace Sciences Meeting and Exhibit, Reno, Nevada, 1997.
29
ORIGINAL_ARTICLE
Experimental study of the characteristics of the wake and drag coefficient changes of a car model in unsteady flow
In this study, changes in velocity, turbulence intensity and drag coefficient in the wake of a notch-back car modelling steady and unsteady flow is measured and evaluated. The blow open circuit wind tunnel is used to simulate fluid flow. Turbulence intensity and nominal maximum speed of the device is measured to be 0.01% and 30m/s, respectively. The speed has been continuously increased by an inverter causing changes in rotational speed of the electromotor. In the near location to the model, the results showed three different regimes in the velocity profile of the model’s wake. With increasing distance from the model and with increasing the speed, three regimes in the wake are close to each other. Drag coefficient for several velocities is measured, where the result shows that decreasing in drag coefficient is proportional with increasing velocity. In addition, the changing trends of higher order velocity of parameters like flatness and skewedness are depicted.
http://admt.iaumajlesi.ac.ir/article_534916_d2f8f6ab3e2080ba83e2374cb4a9e334.pdf
2015-03-01T11:23:20
2020-01-27T11:23:20
55
65
Unsteady Flow
Car model
Drag coefficient
Hot wire anemometry
V.
Barzanooni
mrvahid4154@yahoo.com
true
1
Department of Mechanical Engineering,
Hakim Sabzevari University
Department of Mechanical Engineering,
Hakim Sabzevari University
Department of Mechanical Engineering,
Hakim Sabzevari University
LEAD_AUTHOR
A.B.
Khoshnevis
khosh1966@yahoo.com
true
2
Department of Mechanical Engineering,
Hakim Sabzevari University
Department of Mechanical Engineering,
Hakim Sabzevari University
Department of Mechanical Engineering,
Hakim Sabzevari University
AUTHOR
[1] Barlow, J. B., Rae, W. H., and Pope, A., “Low-Speed Wind Tunnel Testing”, John Wiley & Sons, 1999. Kumagai, S., and Isoda, H., Proc. Combust, Inst. 5, 1984, pp. 129-137.
1
[2] Ahmed‚ S. R.‚ Ramm‚ R. and Faltin‚ G., “Some Salient Features of the Time Averaged Ground Vehicle Wake”, SAE Technical Paper Series 840300‚ Detroit, 1998.
2
[3] Gilli, P., Chometon, F., “Modelling of Stationary Three-Dimentional Separated Air Flows around an Ahmed Reference Model”, Third International Workshop on Vortex, ESAIM Proceedings, Vol. 7, No.10, 1999, pp. 124.
3
[4] Hanaoka, Y., Kiyohira A., “Vehicle Aerodynamic Development using PAMFLOW”, 2003.
4
[5] Gillieron, P., Spohn, A., “Flow Separations Generated by a Simplified Geometry of an Automotive Vehicle”, 2007.
5
[6] Lienhart, H., Stoocks, C., “Flow and Turbulence Structures in the Wake of a Simplified Car Model (Ahmed Model)”, DGLR FachSymp. Der AG STAB, Stuttgart UNIV., 15-17 Nov, 2010.
6
[7] Khalighi, B., Zang, S., Koromilas, C., Balkanyi, S., Bernal, L. P., laccarino, G. and Moin, P., “Experimental and Computational Study of Unsteady Wake Flow behind a Body with a Drag Reduction Device”, SAE PPR. 2006-01-1042.
7
[8] Javareshkiyan, M. H., Shayesteh Sadafiyan, R., and Azarkhish, A., “Numerical and Experimental investigation of Aerodynamics forces on the base model of vehicle”, SID, Vol. 18, No. 1, pp. 49-64, (1385 in Persian).
8
[9] Javareshkiyan, M. H, Zehsaz, M., and Azarkhish, A., “ExprimentalOptimazation of Aerodynamcs forces on the base model of vehicle”, 9th Fluid Dynamics Conference, Shiraz University, (Esfand 1383 in Persian).
9
[10] Watkins, S., Vino, G., “The Effect of Vehicle Spacing on the Aerodynamics of Representative Car Shape”, J. of Wind Engineering and Industrial Aerodynamics 96 1232-12393ED., Vol. 96, No. 3, 2011, pp. 1232-1239.
10
[11] Watkins, S., Vino, G., “The Effect of Vehicle Spacing on the Aerodynamics of Representative Car Shape”, J. of Wind Engineering and Industrial Aerodynamics 96 1232-12393ED., Vol. 96, No. 3, 2011, pp. 1232-1239.
11
[12] Salari. M., Ardakani. M. A., and Taghavi Zonnor. R., “Experimental Study for Effect of Free Flow Temperature Changes and Hot Wire Anemometer on sensors calibration and Velocity measurement”, Journal of Mechanics and AeroSpace, Vol. 1, No. 3, 1384, pp. 49-59 (in Persian).
12
[13] Ardakani, M. A., “Hot Wire Anemometer”, Vol. 1, KhajeNasiroddinTosi University, 1385(in Persian).
13
[14] Morelli, A., “General Layout Characteristic and Performance of a new wind Tunnel for Aerodynamics”, SAE Paper No. 710214, Society of Automotive Engineers, Warrendale, Pa., 1971.
14
[15] Wolf-Heinrich Hucho., “Aerodynamics of Road Vehicles”, 4th Edition, SAE, Society of Automotive Engineers Inc Warrendale, Pa, 1998.
15
[16] Saha, A. K., Muralidhar, K., and Biswas, G. “Experimental Study of Flow Past a Square Cylinder at High Reynolds Numbers”, Experiments in Fluids, Vol. 29, No. 4, 2008, pp. 553-563.
16
[17] Shadaram, A., Azimifrad, M., and Rostami, N., “Study of characteristic flow at the near wake of square cylinder”, J. of Mechanical- aerospace Vol. 3, No. 4 1386 in persain.
17
[18] Goldstein, S., “A Note on the Measurement of Total Head and Static Pressure on a Turbulent Stream”, Proceedings of the Royal Society of London, Series A, Vol. 155, No. 32, 1936, pp. 570-575.
18
[19] LU, B., Bragg, M. B., “Experimental Investigation of the Wake-Survey Method for a Bluff Body with Highly Turbulent Wake”, AIAA-3060, 2002.
19
[20] LU, B., Bragg, M. B., “Experimental Investigation of Airfoil Drag Measurements with Simulated Leading-Edge Ice Using the Wake-Survey Method”, AIAA3919, 2000.
20
[21] LU, B., Bragg, M. B., “Airfoil Drag Measurement with Simulated Leading Edge Ice Using the Wake-Survey Method”, AIAA1094, 2003.
21
[22] Van Dam, C. P., “Recent Experience with Different Methods of Drag Prediction”, Progress in aerospace. Science, Vol. 35, No.8, 1999, pp. 751-798.
22
[23] Chowdhury, H., Moria, H., Iftekhar Khan, A., Alam, F., Watkins, S., “A study on aerodynamic drag of a semi-trailer truck”, Procedia Engineering 56, 2013, pp. 201-205.
23
ORIGINAL_ARTICLE
Predicting Strip Tearing in Cold Rolling Tandem Mill using Neural Network
Strip tearing during cold rolling process has always been considered among the main concerns for steel companies. Several works have been done so far regarding the examination of the issue. In this paper, experimental data from cold rolling tandem mill is used for detecting strip tearing. Sensors are placed across the cold rolling tandem mill. They receive information on parameters (such as angular velocity of the rolls, voltage and the electrical current of electrical motors driving rolls, roll gap, and strip tension force between rolls) directly from the cold rolling tandem mill and save as files. The information included two modes: perfect rolling and ruptured rolling. A neural network was designed by means of MATLAB software and, then, trained using the information from files. Finally, the neural network was examined by new data. It was concluded that neural network has high accuracy in distinguishing between perfect and defected rolling.
http://admt.iaumajlesi.ac.ir/article_534917_e507837ad8d7892c7af7b65efff5ce6f.pdf
2015-03-01T11:23:20
2020-01-27T11:23:20
67
75
Cold Rolling Tandem Mill
Strip Tearing
Neural Network
Multi-Layer Perceptron
A.
Haghani
a.haghani@srbiau.ac.ir
true
1
Department of Mechanics, Faculty of Engineering,
Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
Department of Mechanics, Faculty of Engineering,
Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
Department of Mechanics, Faculty of Engineering,
Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
LEAD_AUTHOR
A. R.
Khoogar
khoogar@yahoo.com
true
2
Department of Mechanical Engineering,
Maleke-Ashtar University of Technology, Lavizan, Tehran, Iran
Department of Mechanical Engineering,
Maleke-Ashtar University of Technology, Lavizan, Tehran, Iran
Department of Mechanical Engineering,
Maleke-Ashtar University of Technology, Lavizan, Tehran, Iran
AUTHOR
F.
Kumarci
kumarci_farshad@yahoo.com
true
3
Department of Computers, Faculty of Engineering,
Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
Department of Computers, Faculty of Engineering,
Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
Department of Computers, Faculty of Engineering,
Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
AUTHOR
[1] Roberts, W., “Cold Rolling of Steel”, 1st ed., Marcel Dekker, New York, 1978, Chap. 2.
1
[2] Bagheripoor, M., Bisadi, H., “Application of artificial neural networks for the prediction of roll force and roll torque in hot strip rolling process”, Journal of Applied Mathematical Modelling, Vol. 37, 2013, pp. 4593-4607.
2
[3] Ghaisari, J., Jannesari, H., and Vatani, M., “Artificial neural network predictors for mechanical properties of cold rolling products”, Journal of Advances in Engineering Software, Vol. 45, 2012, pp. 91-99.
3
[4] Chen, J., Chandrashekhara, K., Mahimkar, C., Lekakh, S. N., and Richards, V., “Void closure prediction in cold rolling using finite element analysis and neural network”, Journal of Materials Processing Technology, Vol. 211, 2011, pp. 245-255.
4
[5] Rath, S., Singh, A., Bhaskar, U., Krishna, B., Santra, B., Rai, D., and Neogi, N., “Artificial neural network modeling for prediction of roll force during plate rolling process”, Journal of Materials and Manufacturing Processes, Vol. 25, 2010, pp. 149-153.
5
[6] Mohanty, I., Datta, S., and Bhattacharjee, D., “Composition–processing–property correlation of cold-rolled IF steel sheets using neural network”, Journal of Materials and Manufacturing Processes, Vol. 24, 2008, pp. 100-105.
6
[7] Shahani, A., Setayeshi, S., Nodamaie, S., Asadi, M., and Rezaie, S., “Prediction of influence parameters on the hot rolling process using finite element method and neural network”, Journal of Materials Processing Technology, Vol. 209, 2009, pp. 1920-1935.
7
[8] Peng, Y., Liu, H., and Du, R., “A neural network-based shape control system for cold rolling operations”, Journal of Materials Processing Technology, Vol. 202, 2008, pp. 54-60.
8
[9] Gudur, P., Dixit, U., “A neural network-assisted finite element analysis of cold flat rolling”, Journal of Engineering Applications of Artificial Intelligence, Vol. 21, 2008, pp. 43-52.
9
[10] Kim, H., Mahfouf, M., and Yang, Y., “Modelling of hot strip rolling process using a hybrid neural network approach”, Journal of Materials Processing Technology, Vol. 201, 2008, pp. 101-105.
10
[11] Xie, H., Jiang, Z., Tieu, A., Liu, X., and Wang, G., “Prediction of rolling force using an adaptive neural network model during cold rolling of thin strip”, International Journal of Modern Physics B, Vol. 22, 2008, pp. 5723-5727.
11
[12] Liang, X.-G., Jia, T., Jiao, Z.-J., Wang, G.-D., and Liu, X.-H, “Application of Neural Network Based on Bayesian Method to Rolling Force Prediction in Cold Rolling Process”, Journal of Iron and Steel Research, Vol. 10, 2008, pp. 1-16.
12
[13] Zhang, L., Zhang, L., y., Wang, J., and Ma, F., T., “Prediction of rolling load in hot strip mill by innovations feedback neural networks”, Journal of Iron and Steel Research, Vol. 14, 2007, pp. 42-51.
13
[14] Yang, J., Che, H., Xu, Y., and Dou, F., “Application of adaptable neural networks for rolling force set-up in optimization of rolling schedules”, Journal of Advances in Neural Networks, Vol. 3973, 2006, pp. 864-869.
14
[15] Kang, G., W., Liu, H., B., “Surface defects inspection of cold rolled strips based on neural network”, IEEE Machine Learning and Cybernetics Conference, Vol. 8, IEEE, Guangzhou, China, 2005, pp. 5034-5037.
15
[16] Son, J., S., Lee, D., M., Kim, I., S., and Choi, S., G., “A study on on-line learning neural network for prediction for rolling force in hot-rolling mill”, Journal of Materials Processing Technology, Vol. 164, 2005, pp. 1612-1617.
16
[17] Lee, D., Lee, Y., “Application of neural-network for improving accuracy of roll-force model in hot-rolling mill”, Journal of Control Engineering Practice, Vol. 10, 2002, pp. 473-478.
17
[18] Frayman, Y., Wang, L., and Wan, C., “Cold rolling mill thickness control using the cascade-correlation neural network”, Journal of Control and Cybernetics, Vol. 31, 2002, pp. 327-342.
18
[19] Lin, J., “Prediction of rolling force and deformation in three-dimensional cold rolling by using the finite-element method and a neural network”, International Journal of Advanced Manufacturing Technology, Vol. 20, 2002, pp. 799-806.
19
[20] Quanfeng, S., Jiangang, Z., “Prediction on five-stand cold rolling mill of rolling force by neural network”, Journal of Iron and Steel, Vol. 2, 2002, pp. 1-8.
20
[21] Gunasekera, J., Jia, Z., Malas, J., Rabelo, L., “Development of a neural network model for a cold rolling process”, Journal of Engineering Applications of Artificial Intelligence, Vol. 11, 1998, pp. 597-603.
21
[22] Larkiola, J., Myllykoski, P., Korhonen, A., and Cser, L., “The role of neural networks in the optimisation of rolling processes”, Journal of Materials Processing Technology, Vol. 80, 1998, pp. 16-23.
22
[23] Korczak, P., Dyja, H., and Łabuda, E., “Using neural network models for predicting mechanical properties after hot plate rolling processes”, Journal of Materials Processing Technology, Vol. 80, 1998, pp. 481-486.
23
[24] Cho, S., Cho, Y., and Yoon, S., “Reliable roll force prediction in cold mill using multiple neural networks”, Journal of IEEE Transactions on Neural Networks, Vol. 8, 1997, pp. 874-882.
24
[25] Aistleitner, K., Mattersdorfer, L., Haas, W., and Kugi, A., “Neural network for identification of roll eccentricity in rolling mills”, Journal of materials processing technology, Vol. 60, 1996, pp. 387-392.
25
[26] Haghani, A., “A Study of Damage Evolution in Cold Rolling Tandem Mill”, MSc. Dissertation, Faculty of Mechanics, Azad University, Khomeinishahr Branch, Isfahan, Iran. 2009.
26
[27] Cichocki, A., Unbehauen, R., Neural Networks for Optimization and Signal Processing, 2nd ed., JOHN WILEY & SONS, New York, 1995, Chap. 3.
27
ORIGINAL_ARTICLE
Finite Element Prediction on the Machining Stability of Boring Machine with Experimental Verification
The occurrence of chatter vibrations in boring operation has a great influence in improving workpiece dimensional accuracy, surface quality and production efficiency. In this paper instability analysis of machining process is presented by dynamic model of boring machine. This model, which consists of machine tool’s structure, is provided by finite element method and ANSYS software. The model is evaluated and corrected with experimental results by modal testing on boring machine in which the natural frequencies and the shape of vibration modes are analyzed. The natural frequencies of this modal testing are extracted through Pulse Labshop and ME’scope modal analysis software.Finally, the stability lobes obtained from this model are plotted and compared with experimental results
http://admt.iaumajlesi.ac.ir/article_534918_e18c7f8fd955bf9448982e94895b7c8e.pdf
2015-03-01T11:23:20
2020-01-27T11:23:20
77
83
Boring Machine Tool
chatter
Modal Analysis
Stability Lobe
R.
Barzegar
raminbarzegar84@yrct.ir
true
1
Young Researchers and Elite Club,
Tabriz Branch, Islamic Azad University, Tabriz, Iran
Young Researchers and Elite Club,
Tabriz Branch, Islamic Azad University, Tabriz, Iran
Young Researchers and Elite Club,
Tabriz Branch, Islamic Azad University, Tabriz, Iran
LEAD_AUTHOR
M.
Mahboubkhah
mahboobkhah@tabrizu.ac.ir
true
2
Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran
Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran
Faculty of Mechanical Engineering, University of Tabriz, Tabriz, Iran
AUTHOR
V.
Zakeri
v.zakeri@iaut.ac.ir
true
3
Department of Mechanical Engineering,
Tabriz Branch, Islamic Azad University, Tabriz, Iran
Department of Mechanical Engineering,
Tabriz Branch, Islamic Azad University, Tabriz, Iran
Department of Mechanical Engineering,
Tabriz Branch, Islamic Azad University, Tabriz, Iran
AUTHOR
R.
Matin
rezamatin@iaut.ac.ir
true
4
Department of Mechanical Engineering,
Tabriz Branch, Islamic Azad University, Tabriz, Iran
Department of Mechanical Engineering,
Tabriz Branch, Islamic Azad University, Tabriz, Iran
Department of Mechanical Engineering,
Tabriz Branch, Islamic Azad University, Tabriz, Iran
AUTHOR
H.
Hosseingholi Pourasl
hamed8264sir@yahoo.com
true
5
Department of Mechanical Engineering,
Eastern Mediterranean University (EMU), Cyprus
Department of Mechanical Engineering,
Eastern Mediterranean University (EMU), Cyprus
Department of Mechanical Engineering,
Eastern Mediterranean University (EMU), Cyprus
AUTHOR
F.
Abdollahzadeh Bina
farzad_abdollahzadeh_bina@yahoo.com
true
6
Department of Mechanical Engineering, Boğaziçi University, Istanbul, Turkey
Department of Mechanical Engineering, Boğaziçi University, Istanbul, Turkey
Department of Mechanical Engineering, Boğaziçi University, Istanbul, Turkey
AUTHOR
[1] Tobias, S. A., “Vibration of machine tools”, Production Engineer, Vol. 43, No. 12, 1964, pp. 599.
1
[2] Altintas, Y. Manufacturing Automation, “Metal cutting Mechanics, Machine Tool Vibrations, and CNC Design”, Cambridge University Press, 200.
2
[3] Budak, E. Ozlu, E., “Analytical modeling of chatter stability in turning and boring operations A multi-dimensional approach”, CIRP Annals- Manufacturing Technology, Vol. 56, No. 1, 2007, pp. 401-404.
3
[4] Altintas, Y., Budak, E., “Analytical prediction of stability lobes in milling”, CIRP Annals- Manufacturing Technology, Vol. 44, 1995, pp. 357-362.
4
[5] Altintas, Y. Ko, J. H., “Chatter stability of plunge milling”, CIRP Annals- Manufacturing Technology, Vol. 55, No. 1, 2006, pp. 361-364.
5
[6] Atabey, F., Lazoglu, I., and Altintas, Y., “Mechanics of boring processes: part I”, International Journal of Machine Tools and Manufacture, Vol. 43, No. 5, 2003, pp. 463-476.
6
[7] Atabey, F., Lazoglu, I., and Altintas, Y., “Mechanics of boring processes: part II-multi –insert boring heads”, International Journal of Machine Tools and Manufacture, Vol. 43, No. 5, 2003, pp. 477-484.
7
[8] Lazoglu, I., Atabey, F., and Altintas, Y., “Dynamic of boring processes: part III- time domain modeling”, International Journal of Machine Tools and Manufacture, Vol. 42, No. 14, 2002, pp. 1567-1576.
8
[9] Altintas, Y., Eynian, M., and Onozuka, H., “Identification of dynamic cutting force coefficients and chatter stability with process damping”, CIRP Annals– Manufacturing Technology, Vol. 57, No. 1, 2008, pp. 371-374.
9
[10] Eynian, M., “Chatter stability of turning and milling with process Damping”, The university of British Columbia, Ph.D. dissertation January, 2010.
10
[11] Budak, E., “An analytical design method for milling cutters with nonconstant pitch to increase stability, part I: theory”, Journal of Manufacturing Science and Engineering, Vol. 125, 2003, pp. 29-34.
11
[12] Budak, E., “An analytical design method for milling cutters with nonconstant pitch to increase stability, part II: application”, Journal of Manufacturing Science and Engineering, Vol. 125, 2003, pp. 35-38.
12
[13] Tobias, S. A., “Machine-tool vibration”, J. Wiley, Vol. 43, 1965.
13
ORIGINAL_ARTICLE
Surface Characteristics Improvement of AZ31B Magnesium by Surface Compositing with Carbon Nano-tubes through Friction Stir Processing
In this research, the compositing of the surface of AZ31B magnesium alloy with CNT was studied by FSP. The parameters under study were rotational speed (500-1500 rpm), transverse speed (12-44 mm/min), number of passes (1-4), and CNT weight fraction (0-2%). Microhardness testing, optical metallography, FESEM, and EDS analysis were employed for the characterization of the samples. The suitable limits for the transverse speed and rotational speed were 12-24mm/min and 870-1140 rpm, respectively. The highest hardness in the FSP without compositing was assigned to the transverse speed of 24 mm/min and rotational speed of 870 rpm with a hardness of about 60 Vickers and the stir region grain size of less than 5 microns. The Zener-Holman parameter was calculated for computation and the least value was related to the conditions of the transverse speed of 12-24 mm/min and rotational speed of 870 rpm; as a result, the samples with the finest grain size were theoretically and experimentally specified. The most homogenous structure with the highest hardness was related to the three-pass state with a hardness of 69 Vickers. The best rate was the CNT weight percentage with a %2 weight enjoying the highest hardness. The FESEM images confirmed the suitable distribution of CNTs in the background after the performance of the three-pass processing.
http://admt.iaumajlesi.ac.ir/article_534919_a7c4d2488ac37d7ef16749060108d13f.pdf
2015-03-01T11:23:20
2020-01-27T11:23:20
85
95
Carbon Nano Tube (CNT)
Friction Stir Processing (FSP)
Surface Composite
Zener-Holloman Parameter
M.
Soltani
maad.soltani@ma.iut.ac.ir
true
1
Department of Materials Engineering,
Isfahan University of Technology, Iran
Department of Materials Engineering,
Isfahan University of Technology, Iran
Department of Materials Engineering,
Isfahan University of Technology, Iran
LEAD_AUTHOR
M.
Shamanian
shamanian@cc.iut.ac.ir
true
2
Department of Materials Engineering,
Isfahan University of Technology, Iran
Department of Materials Engineering,
Isfahan University of Technology, Iran
Department of Materials Engineering,
Isfahan University of Technology, Iran
AUTHOR
B.
Niroumand
behzn@cc.iut.ac.ir
true
3
Department of Materials Engineering,
Isfahan University of Technology, Iran
Department of Materials Engineering,
Isfahan University of Technology, Iran
Department of Materials Engineering,
Isfahan University of Technology, Iran
AUTHOR
[1] Zhang, D. T., Xiong, F., Zhang W. W., Qui, C., and Zhang, W., “Superplasticity of AZ31 Magnesium Alloy Prepared by Friction Stir Processing”, Transactions of Nonferrous Metals Society of China, Vol. 21, 2011, pp. 1911-1916.
1
[2] Gray, J. E., Luan, B., “Protective Coatings on Magnesium and Its Alloys: A Critical Review”, Journal of Alloys and Compounds, Vol. 336, 2002, pp. 88-113.
2
[3] Lim, D. K., Shibayanagi, T., and Gerlich, A. P., “Synthesis of Multi-Walled CNT Reinforced Aluminium Alloy Composite via Friction Stir Processing”, Materials Science and Engineering A, Vol. 507, 2009, pp. 194-199.
3
[4] Woo, W., Choo, H., Brown, D. W., Liaw, P. K., and Feng, Z., “Texture Variation and Its Influence on the Tensile Behavior of a Friction-Stir Processed Magnesium Alloy”, Scripta Materialia, Vol. 54, 2006, pp. 1859-1864.
4
[5] Darras, B. M., “A Model to Predict the Resulting Grain Size of Friction-Stir-Processed AZ31 Magnesium Alloy”, Journal of Materials Engineering and Performance, Vol. 21, No. 7, 2012, pp. 1243-1248.
5
[6] Du, X. H., Wu, B.L., “Using Two-Pass Friction Stir Processing to Produce Nanocrystalline Microstructure in AZ61 Magnesium Alloy”, Science in China Series E: Technological Sciences, Vol. 52, No.6, 2009, pp. 1751-1755.
6
[7] Woo, W., Choo, H., Prime. M. B., Feng, Z., and Clausen, B., “Microstructure, Texture and Residual Stress in a Friction-Stir-Processed AZ31B Magnesium Alloy”, Acta Materialia, Vol 56, 2008, pp. 1701-1711.
7
[8] Faraji, G., Dastani, O., and Akbari Mousavi, S. A. A., “Effect of Process Parameters on Microstructure and Micro-Hardness of AZ91/Al2O3 Surface Composite Produced by FSP”, Journal of Materials Engineering and Performance, Vol. 20, No. 9, 2011, pp. 1583-1590.
8
[9] Asadi, P., Faraji, G., and Besharati, M. K., “Producing of AZ91/SiC Composite by Friction Stir Processing (FSP)”, International Journal of Advanced Manufacturing Technology, Vol. 51, 2010, pp. 247-260.
9
[10] Asadi, P., Faraji, G., Masoudi, A., and Besharati Givi, M. K., “Experimental Investigation of Magnesium-Based Nanocomposite Produced by Friction Stir Processing: Effects of Particle Types and Number of Friction Stir Processing Passes”, Metallurgical and Material Transactions A, Vol. 42A, 2011, pp. 2820-2832.
10
[11] Lee, C. J., Huang, J. C., and Hsieh, P. J., “Mg Based Nano-Composites Fabricated by Friction Stir Processing”, Scripta Materialia, Vol. 54, 2006, pp. 1415–1420.
11
[12] Izadi, H., Gerlich, A. P., “Distribution and Stability of Carbon Nanotubes during Multi-Pass Friction Stir Processing of Carbon Nanotube/Aluminum Composites”, Carbon, Vol. 50, 2012, pp. 4744-4749.
12
[13] Johannes, L. B., Yowell, L. L., Sosa, E., Arepalli, S., and Mishra, R. S., “Survivability of Single-Walled Carbon Nanotubes during Friction Stir Processing”, Nanotechnology, Vol. 17, 2006, pp. 3081-3084.
13
[14] Liu, Q., Ke, L., Liu, F., Huang, C., and Xing, Li., “Microstructure and Mechanical Property of Multi-Walled Carbon Nanotubes Reinforced Aluminum Matrix Composites Fabricated by Friction Stir Processing”, Materials and Design, Vol. 45, 2013, pp. 343-348.
14
[15] Housh, S., Mikucki, B., “Properties and Selection: Nonferrous Alloys and Special-Purpose Materials: Selection and Application of Magnesium and Magnesium Alloys”, United States of America: ASM International, ASM Handbook, Vol. 2, 1990, Chap. 1.
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[16] Becherer, B. A., Witheford, T. J., “Heat Treating: Heat Treating of Ultrahigh-Strength Steels”, United States of America: ASM International, ASM Handbook, Vol. 4, 1991, Chap. 1.
16
[17] Azizieh, M., Kokabi, A. H., and Abachi, A., “Effect of Rotational Speed and Probe Profile on Microstructure and Hardness of AZ31/Al2O3 Nanocomposites Fabricated by Friction Stir Processing”, Materials and Design, Vol. 32, 2011, pp. 2034-2041.
17
[18] Yu, Z., Zhang, W., Choo, H., and Feng, Z., “Transient Heat and Material Flow Modelling of Friction Stir Processing of Magnesium Alloy Using Threaded Tool”, Metallurgical and Materials Transactions A, Vol. 43, 2011, pp. 724-737.
18
[19] Alavi Nia, A., Omidvar, H., and Nourbakhsh, S. H., “Investigation of the Effects of Thread Pitch and Water Cooling Action on the Mechanical Strength and Microstructure of Friction Stir Processed AZ31”, Materials & Design, Vol. 52, 2013, pp. 615-620.
19
[20] Chang, C. I., Du, X. H., and Huang, J. C., “Producing Nanograined Microstructure in Mg–Al–Zn Alloy by Two-Step Friction Stir Processing”, Scripta Materialia, Vol. 59, No. 3, 2008, pp. 356-359.
20
[21] Chang, C. I., Du, X. H., and Huang, J. C., “Achieving Ultrafine Grain Size in Mg–Al–Zn Alloy by Friction Stir Processing”, Scripta Materialia, Vol. 57, No. 3, 2007, pp. 209-212.
21
[22] Yu, Z., Choo, H., Feng, Z., and Vogel, S. C., “Influence of Thermo-Mechanical Parameters on Texture and Tensile Behavior of Friction Stir Processed Mg Alloy”, Scripta Materialia, Vol. 63, No. 11, 2010, pp. 1112-1115.
22
ORIGINAL_ARTICLE
Irreversibility Analysis and Numerical Simulation in a Finned-Tube Heat Exchanger Equipped with Block Shape Vortex Generator
In this paper the effect of block shape Vortex Generators (VGs) on an air-water fin-tube heat exchanger has been studied experimentally using exergy analysis method. Also the effect of these VGs on increasing heat transfer rate has been simulated numerically and the Results show a good agreement with the experiments. In this research we used a wind tunnel to produce wind flow over heat exchanger in the range of 0.054 kg/s to 0.069 kg/s. Hot water was circulating with the steady volume flow rate of 240 L/h and the temperature of 44 to 68 centigrade in the system. These experiments have been repeated with and without VGs on the heat exchanger. Results show using the VGs has reduced Air Side Irreversibility to Heat transfer Ratio (ASIHR). To reveal the effect of VGs on heat exchanger performance with respect to reducing ASIHR, a quantity is used namely Performance of Vortex Generator (PVG). The results represent that PVG values are in the range of less than 15% to over 35% which represents the good effects of VGs on the heat exchanger performance.
http://admt.iaumajlesi.ac.ir/article_534920_2265b0a1e15fffa805f4b8874c50274e.pdf
2015-03-01T11:23:20
2020-01-27T11:23:20
97
106
Heat Exchanger
irreversibility
Steady Flow Rate
Vortex generator
M.
Ghazikhani
ghazikhani@um.ac.ir
true
1
Department of mechanical Engineering,
Ferdowsi University of Mashhad, Iran
Department of mechanical Engineering,
Ferdowsi University of Mashhad, Iran
Department of mechanical Engineering,
Ferdowsi University of Mashhad, Iran
LEAD_AUTHOR
E.
Noorifar
e.noorifar@yahoo.com
true
2
Department of mechanical Engineering,
Ferdowsi University of Mashhad, Iran
Department of mechanical Engineering,
Ferdowsi University of Mashhad, Iran
Department of mechanical Engineering,
Ferdowsi University of Mashhad, Iran
AUTHOR
A.
Mohammadian
al_mo988@yahoo.com
true
3
Department of mechanical Engineering,
Ferdowsi University of Mashhad, Iran
Department of mechanical Engineering,
Ferdowsi University of Mashhad, Iran
Department of mechanical Engineering,
Ferdowsi University of Mashhad, Iran
AUTHOR
[1] Kakac, S., Liu H., “Heat exchangers: selection, rating, and thermal design”, 2nd ed., CRC Press, 2002.
1
[2] Biswas, G., Mitra N. K., and Fiebig M., “Heat transfer enhancement in fin-tube heat exchangers by winglet type vortex generators”, International Journal of Heat and Mass Transfer, Vol. 37, 1994, pp. 283-291.
2
[3] Chen Y., Fiebig M., and Mitra N. K., “Heat transfer enhancement of a finned oval tube with punched longitudinal vortex generators in-line”, International Journal of Heat and Mass Transfer, Vol. 41, 1998, pp. 4151-4166.
3
[4] Chen Y., Fiebig M., and Mitra N. K., “Heat transfer enhancement of a finned oval tube with staggered punched longitudinal vortex generators”, International Journal of Heat and Mass Transfer, Vol. 43, 2000, pp. 417-435.
4
[5] Kotcioglu I., Caliskan S., Cansiz A., and Baskaya S., “Second law analysis and heat transfer in a cross flow heat exchanger with a new winglet-type vortex generator”, Energy, Vol. 35, 2010, pp. 3686-3695.
5
[6] Wang C. C., Lo J., Lin Y. T., and Liu M. S., “Flow visualization of wave-type vortex generators having inline fin-tube arrangement”, International Journal of Heat and Mass Transfer, Vol. 45, 2002, pp. 1933-1944.
6
[7] Tian L., He Y., Tao Y., and Tao W., “A comparative study on the air-side performance of wavy fin-and-tube heat exchanger with punched delta winglets in staggered and in-line arrangements”, International Journal of Thermal Science, Vol. 48, 2009, pp. 1765-1776.
7
[8] Fiebig M., Valencia A., and Mitra N. K., “Wing-type vortex generators for fin-and-tube heat exchangers”, Exp. Therm. Fluid Sci, Vol. 7, 1993, pp. 287-295.
8
[9] Valencia A., Fiebig M., and Mitra N. K., “Heat transfer enhancement by longitudinal vortices in a fin-and-tube heat exchangers element with flat tubes”, ASME J. Heat Transfer, Vol. 118, 1996, pp. 209-211.
9
[10] Joardar A., Jacobi A. M., “Heat transfer enhancement by winglet-type vortex generator arrays in compact plain-fin-and-tube heat exchangers”, International Journal of Refrigeration, Vol. 31, 2008, pp. 87-97.
10
[11] Wu S. Y., Yuan X. F., Li Y. R., and Xiao L., “Exergy transfer effectiveness on heat exchanger for finite pressure drop”, Energy, Vol. 32, 2007, pp. 2110-2120.
11
[12] ANSYS Inc. Fluent 6.3 users guide, Canonsburg, Pennsylvania 15317, USA: ANSYS Inc, Southpointe, 275 Technology Drive; 2006.
12