正交各向异性弹塑性材料中微孔洞的扩张  

MODELING VOID GROWTH IN ORTHOTROPIC ELASTIC-PLASTIC MATERIALS

作　　者：张光[1] 张克实[1] 

机构地区：[1]西北工业大学工程力学系,西安710072

出　　处：《机械强度》2002年第2期246-249,共4页Journal of Mechanical Strength

基　　金：国家自然科学基金 (1 9972 0 55);航空科学基金 (0 0C530 2 2 );西北工业大学博士论文创新基金资助

摘　　要：针对正交各向异性弹塑性多孔材料 ,用有限元方法计算分析内含球形微孔洞的三维六面体体胞在不同三轴应力状态下的变形。结果表明 ,在一定的应力三轴参数下 ,改变作用在体胞上的主应力方向 ,微孔洞长大速度则发生明显的变化 ;其次 ,在较低的应力三轴参数下 ,当Lode参数 μσ=-1时 ,微孔洞长大速度较快 ;各向异性程度越高 ,微孔洞扩张越快。Micromechanical modelling of ductile damage by void nucleation due to inclusions and second phase particles, void growth and coalescence is widely and successfully applied to describe phenomena of isotropic ductile material tearing Stress triaxiality and plastic strain encircling around the void in the isotropic material are found to be of most importance for driving void growth It is important that the effect of the anisotropic property of material on void growth is considered in orthotropic elastic plastic matrix material such as single crystal and anistropy material due to texture A three dimensional cell model containing a spherical void is employed to investigate void growth embedded in orthotropic elastic plastic matrix material by using finite element method The direction of principal stress on a unit cell, lode parameter and the anisotropic degree of material conditions are considered The calculation results show significant influence of the orientation of principal stress of a cell on void volume growth rates under a given stress triaxiality And the results also show that there is a higher void growth rate when the material is of stronger anisotropy or when the Lode parameter μ σ=-1, under low stress triaxiality

关 键 词：正交各向异性 弹塑性材料 微孔洞 扩张 体胞模型 

分 类 号：O344.3[理学—固体力学]