弹性损伤界面复合材料拉压破坏过程数值模拟

Numerical Simulation of Tensile andCompressive Failure Process for CompositeMaterials with Elastic Damage Interfaces

用数值方法模拟含弹性－损伤界面层的纤维／环氧复合材料在受拉、压时的破坏过程．了解到界面是材料的薄弱环节，一旦界面出现临界损伤的裂纹，则材料的承载能力将陡然下降．由于界面裂纹区和其周围的纤维、基体应力释放，并在裂纹尖端引起局部应力集中，从而使得界面的裂纹迅速扩展，导致材料的脆性破坏．为便于分析破坏过程，给出在最大承载力前后的３种状态的材料内应力分布等值线图．

The tensile and compressive rupture process of fiber and epoxy materials with elastic damage interfaces is simulated numerically in this paper. It is understood that the interfacelayer is week part of a composite material. Along with the appearance of an interface criticaldamage, the tensile and compressive loads decrease repidly from maximal those. Since thestress releases in a crack of the interface layer and in the fiber, matrix region around thecrack,and the local stress concentration occur at the crack tip, a critical damage region inthe interface layer expands rapidly. Then the composite materals almost lose its load-capacity and be a character of fully brittle rupture. For the discovery of the rupture process thestress distributions of three cases of the materials before and after reaching the maximal loadare pictured.