Breakdown phenomena in high‐speed dislocations
Breakdown phenomena in high‐speed dislocations
复制标题
高速位错中的击穿现象
DOI：
10.1063/1.1663291
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发表时间：
1974
影响因子：
3.2
通讯作者：
J. H. Weiner
中科院分区：
文献类型：
--
作者：
Y. Earmme;J. H. Weiner
对于位错稳定运动中的原子位移，本文给出了先前由Atkinson和Cabrera处理的修正的Frenkel - Kontorova模型的解析解。我们发现，当位错速度达到临界时，即击穿速度ν B时，先验假设的规则位错运动就会击穿，因此，当位错速度ν≥ν B时，解析解不成立，且ν B小于该模型对应的宏观声速。本文还介绍了在应力水平大于引起位错击穿的应力水平时模型行为的计算机模拟研究结果。
An analytical solution is presented for the atomic displacements in the steady motion of a dislocation in a modified Frenkel‐Kontorova model of the form treated previously by Atkinson and Cabrera. It is found that at a critical dislocation velocity, here termed the breakdown velocity, ν B, the regular dislocation motion postulated a priori breaks down, so that the analytical solution is not valid for dislocation velocities ν ≥ ν B. Furthermore, ν B is less than the corresponding macroscopic sound velocity for this model. The results of computer‐simulation studies of the behavior of the model at stress levels greater than those which cause dislocation breakdown are also presented.