Tribology behavior on scratch tests: Effects of yield strength
- Iowa State Univ., Ames, IA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
In this paper, a three-dimensional (3D) scratch model is proposed to investigate the effects of yield strength of both coatings and substrates. With the help of combined Coulomb and plastic friction, the obtained results comprehensively interpret the experimental phenomena in most metals that with the growth of hardness after heat treatment the scratch friction coefficient (SFC) increases. This interpretation could not be done before. Scratch tests on the surface with or without the coating are discussed. Without the coating the SFC increases due to the decrease of the area with plastic slippage and/or the increase of friction stress during the increase of the yield strength in the material. With a softer substrate the friction stress decreases but the SFC increases, which is caused by the growth of the entire contact area and surface deformation. Conversely, with a stronger substrate the SFC decreases due to an intensified plastic slippage In conclusion, the obtained results pave a new way to understanding the effects of yield strength on scratch tests, interpret experimental phenomena, and should be helpful for an optimum design in experiments.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-06NA25396
- OSTI ID:
- 1356136
- Report Number(s):
- LA-UR-16-27660
- Journal Information:
- Friction, Vol. 5, Issue 1; ISSN 2223-7690
- Publisher:
- Springer - Tsinghua University PressCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Finite element modeling and simulations on indentation and scratch tests on thin films: effects of prestress
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journal | May 2019 |
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