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Crushing Behaviors of Innovative Metal Cellular Solids

Author: ChenYiPing
Tutor: LiZhenHuan
School: Huazhong University of Science and Technology
Course: Engineering Mechanics
Keywords: Cellular solid Auxetic honeycomb Functionally graded foams Impact-resistant Finite element method
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Type: Master's thesis
Year: 2013
Downloads: 26
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Abstract


Cellular solids widely exist in nature, such as wood, cellular, sponge, animal bones,plant stem, etc. With the rapid development of modern industry, metal honeycombs andfoams can be manufactured in large-scale. With the features of lightweight, high specificstrength and good impact-resistant, metal honeycombs and foams are being widely used asthe impact-resistant material in the automotive, aerospace area, etc. However, the studieson new kinds of cellular solids such as auxetic honeycomb, functionally graded materialsare less, affecting their applications in the industry. The objective of present work is tostudy the impact-resistant of the new kinds of materials.In this thesis, the dynamic crushing behaviors of metal honeycombs and foams withdifferent structures are computationally studied by the nonlinear explicit finite elementprogram LS-DYNA. Main works and contributions include:(1) The in-plane crushing behaviors of triangle and concave hexagonal auxetichoneycombs are simulated, and the honeycombs’ deformation mechanism and energyabsorption efficiency are studied.(2) The in-plane crushing behaviors of functionally graded hexagonal honeycombsand triangle auxetic honeycombs are simulated, and the effects of impact velocity anddensity gradients on the deformation modes and energy absorption are studied.(3) The bending collapses of thin-walled rectangular section columns with gradedhoneycomb cores are simulated, and the effects of density gradients on the energyabsorption are studied.(4) The uniform and functional graded Al foam under the quasi-static indentationswith long cylindrical punch are simulated, analytical models are developed to estimate thecrushing force. Based on these, the shear modulus of the foam is deduced by fitting thenumerical results of uniform foam structure and using the developed analytical models. New kinds of cellular solids would have a good prospect as the impact-resistantmaterial in the industry. The research results of this thesis can offer some guidance for thedesign of lightweight and good impact-resistant energy-absorbing structures.

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