承载聚合物复合材料的银纹损伤--破坏分析与计算机模拟

研究承载聚合物复合材料银纹损伤----宏观开裂----材料破坏全过程，确定银纹区的非线性损伤场与变形场历史。引入弹性损伤和粘塑性损伤变量，建立银纹损伤与宏观裂纹耦合的演变模型；提出宏观开裂准则与材料破坏准则；开发相应的计算机模拟程序。为聚合物力学、粘塑性损伤力学和局部破坏力学的发展以及聚合物损伤与破坏的实验分析与计算方法给出新成果。

The craze-damage and crack-propergation mechanisms of particulate reinforced.composites have been first recognized through the performance of systematical.macro- and micro-scopic material damage and failure tests. The theoretical relations of mechanical property-strain-stress-damage, i.e. the visco-elastic damage constitutive.relations, have been then established. The corresponding micro-mechanics model and method, which may be used to estimate the effective mechanical properties, have been presented before the effects of the damage mechanism on them have been studied. The visco-elastic damage-fracture tests have been made by using photo-mechanics.technology; the non-linear strain-stress fields in the damage region nearby crack tip and their history have been obtained; the stress-stran relation in damage region has been derived theoretically. The fracture problem of super-plastic composite plates and the relative experimental method has been inverstigated and the fracture criterion based on damage theory has been finally presented. The algorithm for dynamatic contacting process of composite structure and its finite element method has also been.explored in this project. This work has achieved at the desired results.