MICRO-INERTIA EFFECT AND DYNAMIC POISSONS RATIO OF CLOSED-CELL METALLIC FOAMS UNDER COMPRESSION

摘要：

A significantly decreasing influence of lateral constraint on the crushing stress with increasing loading rates has been found for a closed-cell aluminum foam.This interesting phenomenon may be interpreted by the micro-inertia effect and/or the decrease of Poissons ratio in dynamic compression.In this paper,the three-dimensional Voronoi technique and the explicit finite element method are utilized to investigate the micro-inertia effect and dynamic Poissons ratio of closed-cell metallic foams.The simulation results indicate that the micro-inertia effect plays little role in enhancing the plateau stress of metallic foams.The Poissons ratio varies with the nominal strain and its peak value decreases as impact velocity increases.

关键词： Voronoi structure Metallic foam Micro-inertia Poissons ratio

作者: C.F.Wang Z.J.Zheng J.L.Yu

作者单位: CAS Key Laboratory Mechanical Behavior and Design of Materials,University of Science and Technology of China,Hefei,Anhui 230026,China

会议类型: 国际会议

会议名称: The Third International Conference on Heterogeneous Material Mechanics(第三届国际非均匀材料力学会议)

会议地点: 上海

会议语种:英文

页码: 266-269

在线出版日期: 2011-05-22（万方平台首次上网日期，不代表论文的发表时间）