The modelling of the behavior of dislocation ensemble near the crack tip in the case of constant stress

 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Electron Microscopy and Strength of Materials - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2012, #18
http://www.materials.kiev.ua/article/588

Abstract

The behavior of dislocation ensemble near the crack tip was modeled in the case of constant stress. The time dependence of the total energy of the ensemble and the number and coordinates of dislocations was obtained. It was shown that the stress near the grain wall grows slowly until the first dislocation pair reaches to the wall. The crack opening stress is nonmonotonic in time, but finally, since the dislocation source becomes blocked and dislocation ensemble comes to equlibruim, it tends to constant. Full text download


CRACK TIP, DISLOCATION ENSEMBLE, GRAIN BOUNDARY