期刊
TRIBOLOGY INTERNATIONAL
卷 164, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.triboint.2021.107230
关键词
Stick-slip transition; Adhesion and plasticity; Critical shear stress; Thermal effect; Molecular dynamics simulation
资金
- National Natural Science Foundation of China-Basic Science Center Program [11988102]
- National Natural Science Foundation of China [11802310, 11972347, 11772334, 12022210, 12032001]
- Youth Innovation Promotion Association CAS [2018022]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB22040501]
This study used molecular simulations to investigate the critical shear force required for slip initiation during nano-scratching, revealing that slip initiation depends on contact depth and temperature.
When an external force is suddenly applied to the material interface, how much the critical force is required for the onset of slip? To answer this, we used molecular simulations to study the slip initiation during a nano-scratch. The shear load is applied by a very soft spring to achieve the constant force boundary. Using this model, we studied how much plasticity and adhesion affect the critical shear load. Results show that the slip initiation depends on contact depth because the dominated factor for stick-slip changes from interfacial adhesion in shallow contact to dislocation plasticity in deep contact. Also, the initiation stress of slip depends on temperature; the critical shear stress follows a temperature dependence of similar to TlnT when dislocation plasticity prevails.
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