Tribology behavior on scratch tests: Effects of yield strength

Biao FENG

doi:10.1007/s40544-017-0148-8

Friction 2017, 5(1): 108-114 https://doi.org/10.1007/s40544-017-0148-8

Research Article |

Open Access | Issue | Published: 07 March 2017

Tribology behavior on scratch tests: Effects of yield strength

Show Author's Information Hide Author's Information Biao FENG^{^†}(

)

Department of Aerospace Engineering, Iowa State University, Ames, Iowa 50011, USA

^† Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA

Keywords:

coating, finite element method, tribology behavior, yield strength, scratch

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FENG B. Tribology behavior on scratch tests: Effects of yield strength. Friction, 2017, 5(1): 108-114. https://doi.org/10.1007/s40544-017-0148-8

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Abstract

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. 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.

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Tribology behavior on scratch tests: Effects of yield strength

Show Author's information Hide Author's Information Biao FENG^{^†}(

)

Department of Aerospace Engineering, Iowa State University, Ames, Iowa 50011, USA

^† Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, USA

Abstract

Keywords: coating, finite element method, tribology behavior, yield strength, scratch

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Publication history

Received: 04 October 2016

Revised: 16 November 2016

Accepted: 11 January 2017

Published: 07 March 2017

Issue date: March 2017

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This article is published with open access at Springerlink.com

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