Abstract
The effect of cross slip on cracking along coplanar slip bands in anisotropic single crystals is examined. By considering the activation of slip due to the stress field at a crack tip, it is demonstrated that: 1. (1) cross slip would not be effective in relaxing elastic normal stresses ahead of a crack propagating along coplanar slip bands, and 2. (2) the unrelaxed elastic normal stresses can be plastically relaxed by out-of-plane noncoplanar slip only. This results in a build-up of large normal stresses ahead of the coplanar crack. The magnitude of the maximum normal stress depends on the size of the noncoplanar secondary slip plastic zone and elastic anisotropy. Based on the presence of relatively high normal stresses on both the coplanar and the cross-slip planes, a rationale for explaining the occurrence of simultaneous cracking on two {111} cross-slip planes and the formation of fracture surface ridges in Mar-M200 single crystal is proposed.
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