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arXiv 1609.07553cond-mat.mtrl-sci
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在纳米到微米尺度上控制应变爆发和雪崩

Controlling Strain Bursts and Avalanches at the Nano-to-Micro Scale

Yinan Cui, Giacomo Po, Nasr Ghoniem

摘要:

我们证明,通过三维离散位错动力学模拟,纳米和微米晶体的复杂的动力学响应的外部约束可以调整。在加载速率控制下,应变爆发表现出无标度雪崩统计,类似于许多物理系统中的临界现象。对于位移速率控制的另一个极端,应变突发响应过渡到准周期振荡,类似于粘滑地震。外部负载模式控制,使一个定性的过渡,从自组织临界性准周期振荡的复杂的集体动力学的位错。

英文摘要:

We demonstrate, through 3-dimensional discrete dislocation dynamics simulations, that the com- plex dynamical response of nano and micro crystals to external constraints can be tuned. Under load rate control, strain bursts are shown to exhibit scale-free avalanche statistics, similar to critical phenomena in many physical systems. For the other extreme of displacement rate control, strain burst response transitions to quasi-periodic oscillations, similar to stick-slip earthquakes. External load mode control is shown to enable a qualitative transition in the complex collective dynamics of dislocations from self-organized criticality to quasi-periodic oscillations.

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