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Stress driven fractionalization of vacancies in regular packings of elastic particles.
Soft Matter ( IF 2.9 ) Pub Date : 2020-06-02 , DOI: 10.1039/d0sm00205d
Zhenwei Yao 1
Affiliation  

Elucidating the interplay of defects and stress at the microscopic level is a fundamental physical problem that has a strong connection with materials science. Here, based on the two-dimensional crystal model, we show that the instability mode of vacancies with varying size and morphology conforms to a common scenario. A vacancy under compression is fissioned into a pair of dislocations that glide and vanish at the boundary. This neat process is triggered by the local shear stress around the vacancy. The remarkable fractionalization of vacancies creates rich modes of interaction between vacancies and other topological defects, and provides a new dimension for mechanical engineering of defects in extensive crystalline structures.

中文翻译:

应力驱动的弹性颗粒规则填充中空位的分级分离。

在微观水平上阐明缺陷和应力的相互作用是一个基本的物理问题,与材料科学有着密切的联系。在此,基于二维晶体模型,我们显示了具有不同尺寸和形态的空位的不稳定性模式符合常见的情况。压缩下的空位分裂成一对在边界处滑动和消失的位错。这个整洁的过程是由空位周围的局部剪应力触发的。空位的显着分级创建了空位与其他拓扑缺陷之间相互作用的丰富模式,并为广泛的晶体结构中的缺陷机械工程提供了新的维度。
更新日期:2020-06-24
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