Crack hitting a domain having the same elastic properties but different fracture toughness (due, for example, to thermal processing) is considered. The focus is on the choice between crack deflection by the domain and crack penetration into it. This choice is controlled by two factors: the angle at which the crack approaches the domain and the fracture toughness contrast. This problem is motivated, in particular, by protecting a material against crack propagation in certain undesirable directions, via deflecting a crack by such domains.

中文翻译：

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裂纹接近具有相同弹性特性但断裂韧性不同的区域：裂纹变形与渗透

考虑到裂纹碰到具有相同弹性但具有不同断裂韧性的区域（例如由于热处理）。重点是在由区域引起的裂纹变形和裂纹渗透到区域之间的选择。这种选择受两个因素控制：裂纹接近区域的角度和断裂韧性对比。此问题是激励，特别是，通过防止在某些不希望的方向上的裂纹扩展的材料时，通过由这样的结构域偏转裂纹。