Smart Vehicle Concepts Center, Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, OH 43210, United States.
Ultrasonics. 2014 Jan;54(1):343-50. doi: 10.1016/j.ultras.2013.05.011. Epub 2013 Jun 4.
Ultrasonic friction reduction has been studied experimentally and theoretically. This paper presents a new elastic-plastic cube model which can be applied to various ultrasonic lubrication cases. A cube is used to represent all the contacting asperities of two surfaces. Friction force is considered as the product of the tangential contact stiffness and the deformation of the cube. Ultrasonic vibrations are projected onto three orthogonal directions, separately changing contact parameters and deformations. Hence, the overall change of friction forces. Experiments are conducted to examine ultrasonic friction reduction using different materials under normal loads that vary from 40 N to 240 N. Ultrasonic vibrations are generated both in longitudinal and vertical (out-of-plane) directions by way of the Poisson effect. The tests show up to 60% friction reduction; model simulations describe the trends observed experimentally.
超声摩擦减小已经在实验和理论上进行了研究。本文提出了一种新的弹塑性立方模型，可应用于各种超声润滑情况。使用一个立方体来代表两个表面所有接触的凸起部分。摩擦力被认为是切向接触刚度和立方体变形的乘积。超声振动分别沿三个正交方向施加，单独改变接触参数和变形。因此，摩擦力的整体变化。实验采用不同材料在从 40N 到 240N 的不同法向载荷下进行，以验证超声摩擦减小。通过泊松效应，在纵向和垂直（面外）方向上产生超声振动。测试结果表明，摩擦系数可降低 60%；模型模拟描述了实验中观察到的趋势。
