摘要
含裂纹体疲劳寿命的预测,必须首先了解裂纹扩展路径的全过程,而在层状复合材料中,裂纹扩展的路径非常复杂,不仅可以拐弯,而且可以分叉.因此,首先提出一个简单、适用、统一的裂纹扩展方向的相对强度准则,即应变能释放率比值判据;然后,利用有效解决高梯度问题的数值方法--任意线法,对实测试件的关键时刻(例如,拐弯或进入界面),进行了数值分析;并对典型试件进行了疲劳断裂实验研究.3方面的结果,得到相互的验证.这种一致性,不仅初步证明了这一方法的正确性和适用性,而且为疲劳裂纹扩展全过程的解决,提供了必要的基础.
In order to predict the fatigue life of the cracked bodies, it is necessary, first of all, to find cot the whole process of the crack growth. Because the crack can not only kink out of the interface but also bifurcate in the laminated composites, its growing path is very complicated. So, at first, a relative Strength criterion. (i. e. the energy release rate ratio criterion), which is simple, suitable and unified, should be proposed to determine the growing direction of the fatigue crack. Then, the numerical method-Method of Arbitrary line (i. e. MAL), which is very effective to solve the high gradient problems, is used to analyze the experiment at the key moments (for example, turning into the interface or bifurcating). Moreover, the fatigue fracture tests are carried out for the typical specimen of the laminated composites. The prediction of the numerical results for the crack growing directions according to the above criterion is in good accord with the experimental results. It proves the correctness and the applicability of this approach and facilitates to solve the whole process of the fatigue crack growth in the laminated composite.
出处
《装甲兵工程学院学报》
2000年第2期1-5,17,共6页
Journal of Academy of Armored Force Engineering
基金
国家自然科学基金重点项目!（59731020）
关键词
复合材料
疲劳裂纹
层状结构
扩展方向
应变能释放率
composites fatigue crack laminated structure growing directions strain energy release ratio
作者简介
戴耀,男 54岁 教授 博士
