Maximum twin shear stress factor criterion for sliding mode fracture initiation

Previous researches on the mixed mode fracture initiation criteria were mostly focused on opening mode fracture. In this study, the authors proposed a new criterion for mixed mode sliding fracture initiation, which is the maximum twin shear stress factor criterion. The authors studied a finite width plate with central slant crack, subject to a far field uniform uniaxial tensile or compressive stress.

基于双剪统一强度理论的复合滑开断裂研究

为了预测复合裂纹呈滑开型(Ⅱ型)的断裂,将双剪统一强度理论应用到断裂力学,在此提出了双剪应力因子最大向径复合滑开断裂准则,应用该准则探讨了Ⅰ、Ⅱ型及Ⅰ-Ⅱ复合裂纹滑开断裂问题;并计算了不同裂纹角β情况下,单向受拉中心斜裂纹滑开破坏的开裂角和临界荷载,将其数据与径向剪应力准则的计算结果进行了对比,结果显示两者符合较为一致。因此,证明了该准则在预测复合裂纹呈滑开型(Ⅱ型)断裂是可行的。