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Effects of Normal Load on Microscratch Test of Copper |
LIU Ming,YAN Fu-wen,GAO Cheng-hui |
School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou, Fujian 350116, China |
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Abstract Microscratch experiment was carried out on copper with the Rockwell C diamond conical indenter to investigate the effect of normal load on microscratch test of the sample. Results show that as normal load increases, both penetration depth and residual depth increase linearly, and elastic recovery rate decreases linearly; scratch width increases nonlinearly during the initial stage and then rises linearly with the increasing penetration depth. When normal load varies from 0.08 N to 0.11 N, the friction force increases linearly, the friction coefficient tends to keep constant, and the friction mechanism is adhesion friction; when normal load varies from 0.11 N to 17 N, both the friction force and the friction coefficient nonlinearly increase, and the friction mechanism is ploughing friction; when normal load varies from 17 N to 28 N, the friction coefficient tends to keep constant, the friction force increases linearly, and the friction mechanism is micro-cutting.
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Received: 28 January 2019
Published: 28 August 2020
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