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| Effect of Sample Tilt on Measurement of Friction Coefficient by Microscratch Test of Copper with a Spherical Indenter |
| LIU Ming,HUANG Cheng-xin,GAO Cheng-hui |
| School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, Fujian 350108, China |
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Abstract The microscratch test of copper was carried out by a spherical indenter, and the effect of sample tilt on the measurement of friction coefficient was studied under constant normal load. The results show that the nominal friction coefficient measured in the experiment is linearly related to the tilt angle, and the difference of ±9° will cause the friction coefficient to differ by about 14 times. By establishing the position relation model between the spherical indenter and the inclined state of the sample, it is found that the inclination of the sample has almost no effect on the adhesion friction coefficient, but the plowing friction coefficient changes linearly with the tilt angle. In order to accurately calculate the true friction coefficient under non-tilting condition, the conversion between the nominal friction coefficient and the true friction coefficient can be realized by the flat-on-flat type contact mechanics model. Another way is to reciprocate at different positions on the surface of the sample, and the average value is used as the final result.
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Received: 13 May 2019
Published: 10 October 2020
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2020, Vol. 41 
