T0101-3-2 Molecular Dynamics Analysis of Shielding Effects of Extrinsic Grain Boundary Dislocation on Crack Tip using J-integral

Abstract

Extrinsic grain boundary dislocations (EGBDs) are often observed in ultra fine-grained metals produced by severe plastic deformation (e.g. ECAP or ARB etc.). The mechanical properties of such metals are different from those of coarsegrained metals. That is, EGBDs could be important factor to elucidate the unique mechanical properties. In this study, introducing lattice dislocations into an equilibrium grain boundary by pre-deformation, we evaluate the influence of the EGBD component on the crack tip shielding effect using J-integral analyses.