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摩擦副瞬时实际接触面积是描述摩擦过程的重要参数。接触电阻法是过去测量接触参数的常用方法。然而已经证明,接触电阻与接触面积不成比例,因而不能以接触电阻表征实际接触面积。研究结果表明,超声波是探测摩擦副实际接触面积的理想方法。作者通过试验确定了静态时正压力-实际接触面积-摩擦力的关系、相对滑动速度—接触面积的关系和接触面积—相对静止持续时间的关系等,并在此基础上又以摩擦副瞬时实际接触面积为主参数,描述了干摩擦下的动静过渡过程。
The instantaneous real contact area of friction pair is an important parameter to describe the friction process. Contact resistance is a common method of measuring contact parameters in the past. However, it has been shown that the contact resistance is out of proportion to the contact area and therefore the contact resistance can not be used to characterize the actual contact area. The results show that ultrasonic is the ideal method to detect the actual contact area of friction pair. The author determined the relationship between the positive pressure at static state - the actual contact area - the friction force, the relative sliding velocity - the contact area and the contact area - the relative quiescent duration, etc. On the basis of this, The contact area of the main parameters, describes the dynamic friction under the transition process.