Issue 24, 2020

Stress driven fractionalization of vacancies in regular packings of elastic particles

Abstract

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.

Graphical abstract: Stress driven fractionalization of vacancies in regular packings of elastic particles

Article information

Article type
Paper
Submitted
04 Feb 2020
Accepted
02 Jun 2020
First published
02 Jun 2020

Soft Matter, 2020,16, 5633-5639

Stress driven fractionalization of vacancies in regular packings of elastic particles

Z. Yao, Soft Matter, 2020, 16, 5633 DOI: 10.1039/D0SM00205D

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