Cyclic crack growth in elastic plastic solids: a description in terms of dislocation theory

摘要

Whenever the plastic deformation is in the order of some Burgers vectors, it appears to be reasonable to describe crack tip plasticity by means of "mathematical" dislocations. A discrete dislocation model is presented for the simulation of model I fatigue crack propagation. In order to take into account the crack face contact behind the crack tip a procedure was developed which enables the computation of the dislocation motion even when crack closure occurs.