金属损伤演化方程和层裂准则的确定

文中由唯象分析和细观统计相结合的方法给出了一种新的损伤演化方程．对两种金属，在试验结果和内变量理论的基础上得到了计及损伤的热-粘塑性本构关系．用有限差分数值计算研究了应力波传播规律、损伤发展及层裂．通过自由面速度历史的数值模拟，并基于计算结果与试验结果间的最佳一致性，得到了损伤演化方程和层裂准则中的材料参数．

Determination of the Damage Evolution Equation and Spallation Criterion of Metals

In this paper a new kind form of damage evolution equation by the method of phenomenological analysis and microscopic statistics is presented. On the basis of the experimnetal results and internal variables theory the thermo-viscoplastic constitutive relations for two metals are gotten with damage being considered. The stress wave propagation rules, damage development and spoiling are numerically studied by the finite difference method. By the numerical simulations of the free surface velocity histories and based on the best consistence between the computational results and the experimental ones, the material parameters in the damage evolution equation and the spoliation criterion are obtained.