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Dominant mode of planar fractures and the role of material properties

机译：平面骨折的主导模式和材料特性的作用

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摘要

This study is aimed at determining the regions where different planar fracture modes would prevail in the k(alpha)-k(c)-f space, in which the loading is characterized by the loading ratio k(alpha) = K-I/K-II, while the material properties are characterized by the fracture toughness ratio k(c) = K-IC/K-IIC and the coefficient of friction of the material f. The mode of fracture is determined from the stress state on the fracture plane, which is distinguished from the modes of loading in this study, The modes of fracture considered include the pure tensile fracture for Mode I, the pure shear fracture for Mode II, the tensile-shear fracture for the tensile mixed mode, and additionally, the compressive-shear fracture for the compressive mixed mode. New analytical solutions for the two mixed mode fractures are presented. The boundaries where different fracture mode dominate regions meet in the k(alpha)-k(c)-f space are obtained through pair-wise comparisons of fracture criteria. The results are further verified wherever possible with experiment data on crack growth initiation angles. The partition of k(alpha)-k(c)-f space into different dominant fracture modes also gives a clear picture of how the fracture behavior depends not only on loading, but also on material properties, that include both ductile and quasi-brittle materials when the fracture is the mode of failure.
机译：该研究旨在确定在K（α）-K（c）-f空间中占不同平面骨折模式的区域，其中负载的负载比k（alpha）= ki / k-II ，而材料性质的特征在于断裂韧性比k（c）= k-ic / k-iic和材料F的摩擦系数。从裂缝平面上的应力状态确定裂缝模式，这与本研究中的载荷模式不同，所考虑的裂缝模式包括用于模式I的纯拉伸裂缝，模型II的纯剪切断裂拉伸混合模式的拉伸剪切断裂，另外，压缩混合模式的压缩剪切断裂。提出了两个混合模式裂缝的新分析解决方案。通过对裂缝标准的成对比较获得k（α）-c（c）-f空间中相交不同裂缝模式的边界。随时随地在可能的情况下进一步验证结果。 K（α）-k（c）-f空间的分区为不同的显性骨折模式，还可以清楚地了解骨折行为如何不仅取决于载荷，还取决于材料特性，包括延性和准脆性骨折是失效模式时的材料。

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