闭孔金属泡沫中应力波的传播特性分析  

Propagation Characteristics of Stress Wave in Closed-cell Metal Foam

作　　者：李斌潮[1] 赵桂平[2] 卢天健[1] 

机构地区：[1]西安交通大学强度与振动教育部重点实验室,陕西西安710049 [2]西安交通大学航天航空学院,陕西西安710049

出　　处：《兵工学报》2009年第S2期38-41,共4页Acta Armamentarii

基　　金：国家重大基础研究计划项目(2006CB601202);国家"111计划"引智计划项目(B06024);国家自然科学基金项目(10632060;10825210);国家高技术研究发展计划项目(2006AA03Z519)

摘　　要：为了研究泡沫材料在动态冲击载荷下的变形及内部应力变化情况,通过一维的泡沫材料冲击模型对闭孔金属泡沫材料中应力波尤其是胞元结构塑性坍塌的传播过程及其影响因素进行分析。结果表明:泡沫材料密度以及冲击速度是导致塑性波前应力提高、产生惯性效应的主要因素;同时塑性波的传播速度与冲击速度成正比,与泡沫材料的密实应变成反比;且冲击能量越低,塑性波前在泡沫中推进就越慢,吸收这些能量所需的泡沫材料也越少。In order to study the characteristics of deformation and stress wave in closedcell metal foam subjected to dynamic loading,the propagation process and its influence factors of stress wave in closed-cell metal foam material,especially under the cell's plastic collapse,were analyzed by the one dimension impact model.The analysed result shows that the foam density and impact velocity are the major factors to enhance the stress of the wave front and induce the inertia effects;the propagation speed of the stress wave is directly proportional to the impact velocity and inversely to the densification strain of the foam;the lower the impact energy is,the slower the plastic wave front propagates and the smaller the foam needed to absorb the energy is.

关 键 词：闭孔金属泡沫 应力波 塑性变形 传播 

分 类 号：TB383.4[一般工业技术—材料科学与工程]