基于边界元法求解二维Ⅰ-Ⅱ复合型裂纹断裂参数

Estimating Two-dimensional Complex Crack Fracture Parameters Based on the Boundary Element Method

对于平面复合型裂纹,由于不同的断裂模式,1J积分与应力强度因子有关。因此,必须另外分析如何分离应力强度因子。2J积分结合1J积分或应变能释放率(SERR),可以用于有效的离散和计算应力强度因子。本文介绍III?复合型裂纹的1J,2J的计算,展示了两个各向同性和均质材料属性的示例,在不同裂纹形状和荷载条件情况下,得到了应力强度因子和1J,2J的相应积分值。

For the fracture of in-plane mixed mode crack,because of the different fracture modes,the 1J-integral is related to stress intensity factors（SIFs）.Therefore,additional analysis must be carried out to separate SIFs.The 2J-integral combined with the 1J-integral or strain energy release rate（SERR）,can be employed for efficient decoupling and evaluation of SIFs.In this paper,1J,2J estimation of complex cracks was introduced.Two example problems with isotropic and homogeneous material properties were presented.Under each crack shape and loading condition,stress intensity factors K and the corresponding values of 1J,2J were obtained.