Atomic-scale deformation near to the crack-tip field in body-centered cubic crystals under anti-twinning in-plane shear (mode-II) loading was analyzed by using molecular dynamics. The appearance and movement of dislocations with a Burgers vector of ½[111] were observed on the (112) plane. The critical stress intensity factor, as deduced from the analysis of an edge dislocation which was observed at the crack tip, did not depend upon the method of analysis, and agreed well with Rice's standard value.

Occurrence and Motion of Dislocation from a Mode II Crack Tip in a Body-Centered Cubic Crystal. A.Nakatani, H.Kitagawa, K.Nakatani: Journal of the Society of Materials Science of Japan, 1997, 46[6], 625-30