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arXiv 1106.0195cond-mat.stat-mechcond-mat.mtrl-sci
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三维连续位错动力学的标度理论:自组织分形斑图形成

Scaling theory of continuum dislocation dynamics in three dimensions: Self-organized fractal pattern formation

Yong S. Chen, Woosong Choi, Stefanos Papanikolaou, Matthew Bierbaum, James P. Sethna

摘要:

我们专注于介观位错图案通过连续位错动力学理论(CDD)在三维(3D)。我们研究了三种不同的物理动机的动力学,这始终导致分形形成在3D中具有相当相似的形态,因此,我们认为,这是一个一般特征的3D集体行为的几何必要位错(GND)合奏。这些显著的自相似特征是用物理观测量的关联函数来度量的,这些物理观测量包括GND密度、塑性变形和晶体取向。值得注意的是,所有这些关联函数表现出空间幂律行为,共享一个单一的基本普遍的临界指数为每种类型的动态。

英文摘要:

We focus on mesoscopic dislocation patterning via a continuum dislocation dynamics theory (CDD) in three dimensions (3D). We study three distinct physically motivated dynamics which consistently lead to fractal formation in 3D with rather similar morphologies, and therefore we suggest that this is a general feature of the 3D collective behavior of geometrically necessary dislocation (GND) ensembles. The striking self-similar features are measured in terms of correlation functions of physical observables, such as the GND density, the plastic distortion, and the crystalline orientation. Remarkably, all these correlation functions exhibit spatial power-law behaviors, sharing a single underlying universal critical exponent for each type of dynamics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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