A calculation was made of the evolution of the distribution of deformation plasticity at a crack tip in a crystal that was subjected to an external tensile stress. It was assumed that plastic deformation occurred via the motion of dislocations in the elastic field of the crack. The effect of plastic deformation upon the fluxes of interstitial impurity atoms to a crack tip was estimated. The fluxes of point defects were determined by the hydrostatic component of the elastic stress which arose at the crack tip as a result of superposition of the elastic fields of the cracks and dislocations, by the elastic field of moving dislocations (sweeping out interstitial impurity atoms), and by the dislocation-driven transport of point defects which accumulated in the dislocation cores. The contributions of each point-defect transport mechanism to a crack tip were calculated, and numerical calculations were performed for interstitial H atoms in an α-Fe crystal.

Effect of Plastic Deformation on the Motion of Point Defects at a Crack Tip. D.N.Karpinskii, S.V.Sannikov: Fizika Tverdogo Tela, 1995, 37[6], 1713-23 (Physics of the Solid State, 1995, 37[6], 932-7)