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Trueflow se 7.3 crack8/31/2023 ![]() The resulting crack trapping mechanism is modelled phenomenologically, yielding a quantitative estimate for actual crak tip fracture toughness Gamma_tip, which depns on temperature, crack speed and density of pre-existing dislocations. Once drawn into the immediate vicinity of the crack tip, these dislocations inevitably cause local, atomic scale blunting of the tip. It is found thta dislocations which reside within a strip of certain width along the crack path and which have Burgers vectors of a certain orientation are strongly attracted to the crack tip, and the motion of such dislocations with respect to the moving crack tip is determined. On this basis, the behavior of dislocations in the vicinity of of a moving crack tip has been investigated. Available experimental evidence on cleavage of single crystals suggests that the direct interactions of crack tips with pre-existing dislocations are important in determining the toughness of cleavable crystals. ![]()
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