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29 March 2012 Piezoelectrically-induced ultrasonic lubrication by way of Poisson effect
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It has been shown that the coefficient of dynamic friction between two surfaces decreases when ultrasonic vibra- tions are superimposed on the macroscopic sliding velocity. Instead of longitudinal vibrations, this paper focuses on the lateral contractions and expansions of an object in and around the half wavelength node region. This lateral motion is due to the Poisson effect (ratio of lateral strain to longitudinal strain) present in all materials. We numerically and experimentally investigate the Poisson-effect ultrasonic lubrication. A motor effect region is identified in which the effective friction force becomes negative as the vibratory waves drive the motion of the interface. Outside of the motor region, friction lubrication is observed with between 30% and 60% friction force reduction. A "stick-slip" contact model associated with horn kinematics is presented for simulation and analysis purposes. The model accurately matches the experiments for normal loads under 120 N.
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Sheng Dong and Marcelo J. Dapino "Piezoelectrically-induced ultrasonic lubrication by way of Poisson effect", Proc. SPIE 8343, Industrial and Commercial Applications of Smart Structures Technologies 2012, 83430L (29 March 2012);

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