Underlying fracture trends and triggering on Mode-II crack branching and kinking for quasi-brittle solids
Underlying fracture trends and triggering on Mode-II crack branching and kinking for quasi-brittle solids
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DOI：
10.1016/j.engfracmech.2019.02.036
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发表时间：
2019-04-15
影响因子：
5.4
通讯作者：
Cai, Y. M.
中科院分区：
文献类型：
--
作者：
Li, J.;Xie, Y. J.;Cai, Y. M.
针对 II 型裂纹的断裂分析，提出了一种从奇异应力场边界处萌生多裂纹的几何模型。利用部分积分路径探索了守恒定律，建立了从裂纹尖端萌生的多个裂纹的能量释放率的解析解。理论上研究了准静态 II 型变形中裂纹从裂纹尖端萌生的一些潜在断裂趋势，包括裂纹侧枝和裂纹扭结，这实际上意味着 II 型断裂存在一定程度的不稳定。定义了 II 型裂纹侧枝和扭结的基于 K 的准则和断裂韧性。本模型预测的 II 型加载下裂纹侧枝和扭结的断裂形态以及相应的断裂韧性与文献中报道的岩石断裂的实验观察结果非常吻合。
A geometrical model on multiple cracks initiation from boundary with singular stress fields has been proposed for the fracture analysis of Mode-II crack. The conservation law has been explored utilizing a partial integral path, from which an analytical solution of the energy release rate for multiple cracks initiation from a crack tip has been established. Some underlying fracture trends of cracks initiation from a crack tip, including crack side-branching and crack kinking, for quasi-static Mode-II deformation have been theoretically investigated, which implies actually some degree of instability for Mode-II fracture. The K-based criterions and fracture toughness for Mode-II crack side-branching and kinking have been defined. The fracture configurations of crack side-branching and kinking under Mode-II loading and corresponding fracture toughness predicted by the present modelling agree well with the experimental observations on the rock fracture reported in the literatures.