Influence of radial density arrangement on mechanical properties of metal foam under impact loading

被引：0
|
作者：
Wang G. [1 ,2 ]
Liu M. [1 ,2 ]
Song H. [1 ,2 ]
Wang B. [1 ,3 ]
机构：
[1] Institute of Applied Mechanics, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi
[2] Shanxi Key Laboratory of Material Strength & Structural Impact, Taiyuan University of Technology, Taiyuan, 030024, Shanxi
[3] Department of Mechanical and Aerospace Engineering, London Brunel University, London
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2020年 / 40卷 / 07期
关键词：
3D-Voronoi technique; Density gradient parameter; Energy absorption; Graded metal foam;
D O I：
10.11883/bzycj-2019-0403
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Based on the generation method of layered density graded foam, new radial density graded foam models were designed by 3D-Voronoi technique, and their mechanical behavior under different impact loads was numerically simulated by finite element software. By analyzing the effects of impact velocity, density gradient and average relative density on the stress of impact end and support end, and energy absorption capacity of metal foams, it is found that the radial positive graded foam has smaller stress values at both ends than the layered positive and negative graded foams, which can simultaneously protect objects at any ends. The stress fluctuation of radial negative graded foam is small, which can ensure the stability of the force received by the object, and the energy absorption values of four metal foams vary alternately at different impact velocities. For the radial graded foam, energy absorption capacity is insensitive to density gradient, but sensitive to gradient direction. The energy absorption capacity of radial negative graded foam is always greater than radial positive graded foam. The larger the average relative density, the greater the stress at both ends, and the energy absorption effect is also enhanced. © 2020, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved.
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