Dislocation jamming and Andrade creep
Dislocation jamming and Andrade creep
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DOI：
10.1103/physrevlett.89.165501
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发表时间：
2002-10-14
影响因子：
8.6
通讯作者：
Zapperi, S
中科院分区：
文献类型：
--
作者：
Miguel, MC;Vespignani, A;Zapperi, S
我们模拟了相互作用位错集合在外部剪切应力作用下的滑动运动，并表明相关的塑性蠕变松弛遵循安德拉德定律。我们的结果表明，塑性变形晶体中的安德拉德蠕变涉及动态转变附近位错结构的相关运动，该动态转变将流动相与堵塞相分开。位错倍增和噪声存在下的模拟证实了这一发现的稳健性，并强调了亚稳态结构形成对于弛豫过程的重要性。
We simulate the glide motion of an assembly of interacting dislocations under the action of an external shear stress and show that the associated plastic creep relaxation follows Andrade's law. Our results indicate that Andrade creep in plastically deforming crystals involves the correlated motion of dislocation structures near a dynamic transition separating a flowing from a jammed phase. Simulations in the presence of dislocation multiplication and noise confirm the robustness of this finding and highlight the importance of metastable structure formation for the relaxation process.