延性材料动态损伤演化模型研究

从微损伤系统的统计描述出发，应用Ｍｏｒｉ－Ｔａｎａｋａ理论的物理思想，考虑了微孔洞间的相互作用，建立了延性材料动态损伤的统计演化模型。结果能够描述材料在外载作用下的损伤弱化效应。还分析了材料变形中的两种不同的耗散机制，考虑了含损伤的本构关系。将上述模型用于几种材料的层裂过程数值模拟，并与实验结果作了初步比较。

STUDY ON DYNAMIC DAMAGE EVOLUTION OF DUCTILE MATERIALS

Based on the statistical theory of micro-damage system, taking account of the interaction of the voids, using the physical idea of Mori-Tanaka's theory, the paper sets up a statistical model of dynamic evolution of ductile materials which comprehensively explains the physical phenomena of material weakening along with the damage increasing. The two opinions of poles apart of dissipation mechanism in material deformation are discussed, the constitutional equation containing damage is set up and used on spalling simulation of serveral materials, it's results are compared to the experimental results.