Dislocation motion and instability
Dislocation motion and instability
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DOI：
10.1016/j.jmps.2013.03.002
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发表时间：
2013-08
影响因子：
5.3
通讯作者：
Yichao Zhu;S. Chapman;A. Acharya
中科院分区：
文献类型：
--
作者：
Yichao Zhu;S. Chapman;A. Acharya
利用Peach-Koehler公式计算了单个（非平面）曲线位错产生的应力，得到了位错自应力。这与运动定律相结合，给出了一般位错曲线的自诱导运动。然后进行直线的、均匀平移的位错的稳定性分析。位错被发现是容易受到螺旋不稳定性，最大的增长率发生时，位错几乎是，但不完全是，纯螺旋。的非线性演化的不稳定性的数值确定，并讨论了滑移带的形成和非Schmid屈服行为的影响。
The Peach–Koehler expression for the stress generated by a single (non-planar) curvilinear dislocation is evaluated to calculate the dislocation self stress. This is combined with a law of motion to give the self-induced motion of a general dislocation curve. A stability analysis of a rectilinear, uniformly translating dislocation is then performed. The dislocation is found to be susceptible to a helical instability, with the maximum growth rate occurring when the dislocation is almost, but not exactly, pure screw. The non-linear evolution of the instability is determined numerically, and implications for slip band formation and non-Schmid behavior in yielding are discussed.