In previous work, computer simulation of dislocation emission and motion was carried out considering the stress singularity near the crack tip. It was found that there is a region in which no dislocation exists along the slip plane near the stressed source, namely, a dislocation free zone (DFZ), and that there is an inverse pileup of dislocations against the tip of this DFZ. A formula was obtained correlating the maximum dislocation density with the DFZ length.
Based on those results, an evaluation has now been attempted for fracture toughness within the brittle-ductile transition range of steel. The effect of dynamic loading on the fracture toughness and trigger point observed in the experimental results reported in the literature is explained.
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