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.
|Number of pages||14|
|Journal||ASTM Special Technical Publication|
|Publication status||Published - 1995 Dec 1|
|Event||Proceedings of the 24th National Symposium on Fracture Mechanics - Gatlinburg, TX, USA|
Duration: 1992 Jun 30 → 1992 Jul 2
ASJC Scopus subject areas