Finite Element Crushing Analysis, Neural Network Modelling and Multi-Objective Optimization of the Honeycomb Energy Absorbers

Document Type: Original Article

Authors

1 Department of Mechanical Engineering, College of Engineering, University of Takestan, Takestan, Iran

2 Department of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran

3 Department of Automotive Engineering, Iran University of Science and Technology, Tehran, Iran

Abstract

The thin-walled honeycomb structures are one of the most common energy absorber types. These structures are of particular use in different industries due to their high energy absorption capability. In this article, the finite element simulation of honeycomb energy absorbers was accomplished in order to analyze their crushing behavior. 48 panels with different hexagonal edge length, thickness and branch angle were examined. In the following, the amounts of mean stresses versus the geometric variables using neurotic lattices were considered. Comparison between the finite element results and the obtained neural network model verified the high accuracy of the obtained model. Then the model was optimized by one of the efficient genetic algorithm methods called “Multi-objective Uniform-diversity Genetic algorithm”. The obtained optimum results provide practical information for the design and application of these energy absorbers regards to designer requirement. It was observed that honeycomb energy absorbers with 11.07 mm hexagonal edge length, 0.078 mm wall thickness and 123-degree branch angle have the maximum energy absorption over the panel mass.

Keywords


[1]     Alexander, J. M., “An Approximate Analysis of the Collapse of Thin Cylindrical Shells Under Axial Loadingˮ, Q J. Mechanics Appl Math, Vol. 13, 1960, pp. 10-15.

[2]     Johnson, W., Mamalis, A. G., “Crashworthiness of Vehicles Londonˮ, Mech. Eng Publications Ltd. London, 1978.

[3]     Johnson, W., Reid, S. R., “Metallic Energy Dissipating Systemsˮ, ASME Applied Mechanics Review, Vol. 31, 1978, pp. 277-288.

[4]     Jones, N., Wierzbicki, T., “Structural Crashworthinessˮ, Butterworth and Co Publishers, London, 1983.

[5]     Mamalis, A. G., Johnson, W., “The Quasi-Static Crumpling of Thin Walled Circular Cylinders and Frusta Under Axial Compressionˮ, Int J Mech Sci, Vol. 25, 1983, pp. 713-732.

[6]     Abramowicz, W., Jones, N., “Dynamic Axial Crushing of Square Tubeˮ, Int J of Impact Eng, Vol. 2, 1984, pp. 179-208.

[7]     Jones, N., Abramowicz, W., “Static and Dynamic Axial Crushing of Circular and Square Tubes. Proceeding of the Symposium on Metal Forming and Impact Mechanicsˮ, Oxford: Pergamon Press, 1985.

[8]     Wierzbicki, T., “Crushing Analysis of Metal Honeycombˮ, Int. J. Impact Eng., Vol. 1, 1983, pp. 157-174.

[9]     Zhang, J., Ashby, M. F., “The Out of Plane Properties of Honeycombˮ, Int. J. Mech Sci, Vol. 34, 1992, pp. 475-489.

[10]  Shahmirzaloo, A., Farahani, M., “Determination of Local Constitutive Properties of Aluminium Using Digital Image Correlation: A Comparative Study Between Uniform Stress and Virtual Fieldsˮ, Int J of Advanced Design and Manufacturing Technology, Under publication.

[11]  Sam Daliri, O., Farahani, M., “Characterization of Stress Concentration in Thin Cylindrical Shells with Rectangular Cutoutˮ, Int J of Advanced Design and Manufacturing Technology, Vol. 2, No. 1, 2008, pp. 43–54.

[12]  Alavi Nia, A., Sadeghi, M. Z., “The Effects of Foam Filling on Compressive Response of Hexagonal Cell Aluminum Honeycombs Under Axial Loading. Experimental Studyˮ, Mater des., Vol. 31, 2010, pp. 1216–1230.

[13]  Yin, H., Wen, G., “Theoretical Prediction and Numerical Simulation of Honeycomb Structures with Various Cell Specifications Under Axial Loadingˮ, Int. J. Mech Mater Des., Vol. 7, 2011, pp. 253–263.

[14]  Higgins, A., “Adhesive Bonding of Aircraft Structuresˮ, Int. J. Adhes., Vol. 20, 2000, pp. 367–376.

[15]  Santosa, S. P., Wierzbicki, T., Hanssen, A. G., “Experiment and Numerical Studies of Foam-Filled Sectionsˮ, Int. J. Impact Eng., Vol. 24, 2000, pp. 509–534.