二相介质中的运动位错

MOVING DISLOCATION IN TWO PHASE MEDIUM

本文考虑二相介质中与平面相界平行的匀速运动直线位错。采用了与位错相对静止的运动坐标系,在此坐标系中推广位错各向异性弹性理论的普遍方法,并利用弹性力学中的格林函数方法处理相界面,计算得到此位错在介质中所产生的总弹性场,以及其所受到的“像力”。本文所提出的理论方法有一般的适用性,结果可以用于考虑此位错与其它缺陷的相互作用,以及二相介质的力学性质。

We consider in this paper a straight dislocation moving uniformly parallel to the planar phase boundary in a two phase medium. We take a moving coordinate system, in which the dislocation is relatively at rest, and extend the general anisotropic elastic theory of dislocation to this coordinate system. We employ the Green function method in elastic theory to treat the phase boundary, thus obtain the total elastic field produced by this moving dislocation and the 'image force' acting on it. Our theoretical method is applicable in general, it can be used to consider the interaction between this dislocation and other lattice defects, and mechanical properties of the two phase medium.