16 April 2014 Model for friction and wear reduction through piezoelectrically assisted ultrasonic lubrication
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This article presents an analytical model for piezoelectrically-assisted ultrasonic friction and wear reduction. A cube is employed to represent the asperities in contact between two surfaces. Dynamic friction is considered as the sum of two friction components that depend on deformation of the cube and relative velocity. Ultrasonic vibrations change the geometry, contact stiffness, and deformation of the cube, as well as the relative velocity, which leads to a reduction in the effective dynamic friction. Volume loss of surface wear is explained by the integral of half of the cube volume over the time duration of the sliding. Change of the cube geometry caused by ultrasonic vibrations results in a change of the cube volume. A piezoelectrically-assisted tribometer was designed and built for pin-on-disc friction and wear tests. The experimental measurements validate the model for ultrasonic friction reduction at various macroscopic sliding velocities, and for ultrasonic wear reduction at various sliding distances with most errors less than 10%.
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Sheng Dong, Sheng Dong, Marcelo J. Dapino, Marcelo J. Dapino, "Model for friction and wear reduction through piezoelectrically assisted ultrasonic lubrication", Proc. SPIE 9059, Industrial and Commercial Applications of Smart Structures Technologies 2014, 90590C (16 April 2014); doi: 10.1117/12.2046295; https://doi.org/10.1117/12.2046295

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