Ductile-Brittle Behavior along Crack Front and T-Stress
We present new results of molecular dynamic (MD) simulations in 3D bcc iron crystals with embedded central through crack (001) of Griffith type loaded in mode I. Two different sample geometries of the same crystallographic orientation were tested with negative and positive values of the T-stress, which change the ductile-brittle behavior along the crack front in 3D. This phenomenon is explained in the framework of stress analysis, both on the continuum and atomistic level.
A. Uhnáková et al., "Ductile-Brittle Behavior along Crack Front and T-Stress", Key Engineering Materials, Vol. 465, pp. 69-72, 2011