复合材料层板屈曲开裂非线性失效准则

Nonlinear Failure Criterion of Composite Laminate

本文在虚裂纹逐步闭合法实现能量释放率分量分离的基础上 ,提出了一种新型的适用于脆性基体复合材料或 GIc 不超过 GIIc 的韧性基体复合材料的失效准则 ,可以用于解决含分层复合材料层合结构的分层扩展问题。实例分析中计算结果与试验数据吻合较好。

The growth of an elliptic delamination due to local buckling and postbuckling is investigated with large deflection theory of plate and fracture mechanics. Delamination growth is assumed to be governed by the strain energy release rates. Based on Virtual Crack Closure Technique (VCCT) of plate theory, a new technique is developed, which is suitable for both physical linear and nonlinear problems, can be used to calculate GI and GII digitally to any accuracy with a computer. A nonlinear failure criterion is obtained, It is good agreement with the experiment data.