Volume 14, Issue 16 (Forth Special Issue 2015)                   Modares Mechanical Engineering 2015, 14(16): 302-310 | Back to browse issues page

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Abstract:   (6279 Views)
When two bodies slide on each other the asperities are engaged and deformed which causes the dynamic friction. By superposing ‎ultrasonic oscillation to one of the bodies, the friction force is reduced . The experiments show that the friction force may be reduced by ‎about 60 percent depending on material properties and the kinetics of the two bodies. This phenomenon is widely used in metal forming ‎and metal cutting. This phenomenon may be used as a replacement of lubricants in such processes due to its higher efficiency and less ‎pollution effects . ‎ In this research an elastic-plastic model for the surface contact is given which is capable of predicting the friction force when ultrasonic ‎vibrations are superimposed to macroscopic motion . The result of this model is compared with that of the experimental values. The ‎differences between these values are shown to be less than 10 percent . The result of the model is also compared with that of the Dong ‎model. The comparison show that the present model ‎‏ ‏‎ has better accuracy of the Dong model .‎
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Article Type: Research Article | Subject: Vibration|Sonic Flow|Analytical Methods|Metal Forming
Received: 2014/04/30 | Accepted: 2014/07/4 | Published: 2014/11/15

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