期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.106001
关键词
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资金
- NSF [1130525, 1100712]
- U.S. Army Research Office [W911NF-12-1-0012]
- General Motors
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1100712] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1130525] Funding Source: National Science Foundation
Using in situ imaging, we report surface fold formation and fluidlike flow instabilities in sliding of annealed copper. We demonstrate using simulations that folding is principally driven by grain-induced plastic instability. The phenomenon shows remarkable similarities with Kelvin-Helmholtz-type flow instabilities in fluids. While such instabilities have been conjectured to exist in sliding interfaces at the nanoscale, we find vortices and folding in metals at the mesoscale. The occurrence of folds impacts many applications, including surface generation processes and tribology.
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