Abstract
The present study focuses on the effects of a geometrical discontinuity, strength mismatching, which can increase plastic constraint due to heterogeneous plastic straining, and the loading rate on the critical condition for ductile fracture initiation using a two-parameter criterion based on equivalent plastic strain and stress triaxiality. Fracture initiation testing was conducted under dynamic loading using circumferentially notched bend specimens. In order to evaluate the condition for the ductile crack initiation state in the specimens, a thermal elastic/plastic dynamic finite element analysis considering the temperature increase due to plastic deformation was performed. The two-parameter criterion was shown to be applicable to ductile cracking from the surface of the prenotched root in the strength mismatched specimen under dynamic bend loading.
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