开孔弹性泡沫材料拉伸变形过程的数值模拟  

NUMERICAL SIMULATION OF THE TENSILE DEFORMATION PROCESS OF LOW-DENSITY OPEN-CELL ELASTIC FORMS

作　　者：卢子兴[1] 张家雷[1] 

机构地区：[1]北京航空航天大学固体力学研究所,北京100083

出　　处：《机械强度》2009年第3期432-436,共5页Journal of Mechanical Strength

基　　金：国家自然科学基金(10572013);北京市教育委员会共建项目建设计划(XK100060522)资助~~

摘　　要：为了研究低密度弹性开孔泡沫材料的拉伸力学性能,文中建立具有不同胞体几何特性的泡沫材料随机模型,并用有限元方法模拟该材料的拉伸变形过程。同时,从材料的微结构层次上分析弹性开孔泡沫材料拉伸变形的机制,以及相对密度和胞体几何性质对拉伸非线性力学行为的影响。并且,将拉伸应力—应变曲线与Warren和Kraynik的四面体微结构模型的预测结果进行对比,说明数值模拟较好地反映开孔泡沫材料的拉伸变形特征。In order to study the tensile mechanical properties of low-density elastic open-cell foams, the foam random models with different cell geometrical properties are constructed, and the tensile process of these materials are simulated by the finite element method. Through the level of material microstructure, the tensile deformation mechanism of elastic open-cell foam is analyzed. The influences of relative density and cell shape properties on tensile nonlinear mechanical behavior are also studied. The tensile stress-strain curves are compared with theoretical prediction by the Warren ＆ Kraynik＇s tetrahedron model, numerical simulation reflects the tensile deformation characteristics of open-cell foams well.

关 键 词：开孔泡沫材料 拉伸变形 随机模型 有限元 非线性模拟 

分 类 号：TB383[一般工业技术—材料科学与工程] O343[理学—固体力学]