作者
Murari Singh, Misaki Ozawa, Ludovic Berthier
发表日期
2020/2
期刊
Physical Review Materials
卷号
4
期号
2
页码范围
025603
出版商
American Physical Society
简介
Amorphous solids display a ductile to brittle transition as the kinetic stability of the quiescent glass is increased, which leads to a material failure controlled by the sudden emergence of a macroscopic shear band in quasistatic protocols. We numerically study how finite deformation rates influence ductile and brittle yielding behaviors using model glasses in two and three spatial dimensions. We find that a finite shear rate systematically enhances the stress overshoot of poorly annealed systems, without necessarily producing shear bands. For well-annealed systems, the nonequilibrium discontinuous yielding transition is smeared out by finite shear rates and is accompanied by the emergence of multiple shear bands, as reported in metallic glass experiments. We show that the typical size of the bands and the distance between them increases algebraically with the inverse shear rate. We provide a dynamic scaling …
引用总数
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