跨音速
位错
各向同性
分子动力学
辐射
自由面
休克(循环)
动力学(音乐)
物理
应变率
冲击波
凝聚态物理
材料科学
机械
光学
热力学
量子力学
医学
声学
内科学
空气动力学
作者
Daniel N. Blaschke,Ta Nguyen Binh Duong,Michael J. Demkowicz
出处
期刊:Cornell University - arXiv
日期:2023-05-11
标识
DOI:10.1103/physrevb.108.224102
摘要
Transonic defect motion is of interest for high strain-rate plastic deformation as well as for crack propagation. Ever since Eshelby's 1949 prediction in the isotropic limit of a 'radiation-free' transonic velocity $v_\text{RF}=\sqrt{2}c_{\textrm{T}}$, where shock waves are absent, there has been speculation about the significance of radiation-free velocities for defect mobility. Here, we argue that they do not play any significant role in dislocation dynamics in metals, based on comparing theoretical predictions of radiation-free velocities for transonic edge dislocations with molecular dynamics simulations for two face-centered cubic (FCC) metals: Cu, which has no radiation-free states, and Ag, which does.
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