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arXiv 1004.0866cond-mat.softcond-mat.mtrl-sci
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二维高密度Lennard-Jones二元混合物中的阻塞粒子群和动力学

Jammed Particle Configurations and Dynamics in High-Density Lennard-Jones Binary Mixtures in Two Dimensions

Hayato Shiba, Akira Onuki

摘要:

我们研究的转换中的粒子配置和动力学在致密的Lennard-Jones二元混合物组成的小颗粒和大颗粒。通过在低温下改变组成,我们实现了具有缺陷的晶体、具有小晶粒的多晶和具有各种程度的无序的玻璃。特别是,我们显示的配置,其中大多数物种组成的小的结晶区域被包围由两个物种组成的无定形层。我们使用键断裂的方法和以下的粒子位移可视化的动态配置变化。在静止的堵塞状态下,动力学严重减慢,并且在任何组合物下都是高度不均匀的。在剪切中,塑性形变在相对脆弱的区域中多次发生,在应变高度局部化的地方发展成大规模的剪切带。这样的带出现在短时间尺度上,并在有限的寿命内在长时间尺度上变化。

英文摘要:

We examine the changeover in the particle configurations and the dynamics in dense Lennard-Jones binary mixtures composed of small and large particles. By varying the composition at a low temperature, we realize crystal with defects, polycrystal with small grains, and glass with various degrees of disorder. In particular, we show configurations where small crystalline regions composed of the majority species are enclosed by percolated amorphous layers composed of the two species. We visualize the dynamics of configuration changes using the method of bond breakage and following the particle displacements. In quiescent jammed states, the dynamics is severely slowed down and is highly heterogeneous at any compositions. In shear, plastic deformations multiply occur in relatively fragile regions, growing into large-scale shear bands where the strain is highly localized. Such bands appear on short time scales and change on long time scales with finite life times.

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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