关键词: 磨损, 线接触, 接触压力, 奇异积分方程, 接触形状, 数值分析

Abstract: Wear exists in the whole service lifetime of mechanical parts and produces great impact on the lifetime of a machine.Current researches on wear mainly focus on experiments due to the dynamic complexity of wear process,which may increase the production cost and the product design cycle.In order to solve this problem,an Archard s model-based numerical method is proposed,which is used to numerically analyze the whole process of elastic wear in line contact and obtain the normal contact pressure as well as wear depth at different sliding distances.The simulation process is conducted step by step,i. e. ,in each step,the surface contact topography is updated until the maximum sliding distance is achieved.Calculated results show that,for line contact,the contact pressure offsets with respect to the initial contact point at which friction force exists,and the offset becomes obvious as the friction coefficient increases,at the same time,the contact width increases slightly.Moreover,it is found that,in wear process,the contact state transfers from line contact to surface contact,and the asymmetry of contact pressure distribution gradually diminishes till to a symmetrical state.Experimental results show that the numerical prediction values are consistent with the experimental ones.

Key words: wear, line contact, contact pressure, singular integral equation, contact topography, numerical analysis