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Abstract:
The resolved shear
stress along the slip direction of a slip system in the crack tip region
was deduced, and the crack tip Schmid factor was defined. When the crack
tip emitted dislocations, the choice of slip systems at crack tip
depended on the crack tip Schmid factor. And in the vicinity of crack
tip. When dislocation sources were activated or cross slip of screw
dislocation was taken placed, the choice of slip systems also depended
on the crack tip Schmid factor.
Key words:
Stress
field Crack propagation Fracture mechanics
国家自然科学基金和上海市自然科学基金资助项目. Received 19910518,
received in revised form 19920115
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