夹层材料裂纹体疲劳载荷作用下的J积分研究

A Study of J Integral of Cracked Sandwich Body Under Fatigue

通过弹塑性有限元方法研究了裂纹平行于界面时夹层材料在I型疲劳功载荷作用下扩展裂纹的J积分的适用性。结果表明，在疲劳裂纹的起裂阶段，J积分具有良好的守恒性，而在随后的疲劳裂纹扩展过程中，由于裂纹尖端区域残留应力的影响，J积分具有明显的路径依赖性。

The suitability of applying J integral into sandwiched material with a fatigue crack parallel to the interface was studied by elastic-plastic finite element method under model I condition.It was found that,J integral had a good path independence at the initial stage of the fatigue crack growth.Because of the effect of residual stress of crack tip region,J integral appeared a significant path dependence in the afterward stage of fatigue crack growth.