摘要
在Johnson方法的基础上,本文采用细观方法提出了一个延性材料动态损伤模型.模型中考虑了材料的硬化、应变率效应和惯性效应.同时进行了纯铜一维层裂实验,对软回收试件进行了显微金相和定量金相分析,观察到了一些有意义的力学现象.利用一维Lagrange 有限差分动力学程序,采用本文提出的损伤模型对纯铜的层裂过程进行了数值模拟,得到了比较满意的结果.
By means of mcso-damage mechanics,a model of dynamic ductile damage of using a mean tensilestress is developed,in which work-hardening behavior,rate-dependent contribution and inertial effectsare taken into account.The impact test for pure copper plate in one-dimensional plane strain condition isperformed.Some significant mechanical phenomena are observed by microscopic observations of the spal-lcd specimen.The mathematical model presented in this work is incorporated in a hydrodynamic onedimensional finite-difference computer code to simulate the process of spallation of pure coppersample.The comparison of numerical results and experimental results shows that the model can describespall test successfully.
出处
《固体力学学报》
CAS
CSCD
北大核心
1993年第4期289-296,共8页
Chinese Journal of Solid Mechanics
关键词
延性动态损性
金相分析
纯铜
dynamic duetile damage
porosity
microscopic observation
numerical simulation
