Wang Shengjie, Wahab Magd Abdel
Department of Electromechanical, Systems and Metal Engineering, Soete Laboratory, Faculty of Engineering and Architecture, Ghent University, 9000 Ghent, Belgium.
Division of Computational Mechanics, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam.
Materials (Basel). 2021 Apr 8;14(8):1840. doi: 10.3390/ma14081840.
Fretting wear is a common phenomenon that happens between contact parts when there is an oscillatory relative movement. To investigate wear characteristics history in the fretting process, the finite element method (FEM) is commonly applied to simulate the fretting by considering the wear in the model. In most literature publications, the wear coefficient is considered as a constant, which is not a real case based on the experimental results. To consider the variation of wear coefficient, a double-linear model is applied in this paper, and the tribologically transformed structure (TTS) phase is considered in the study of the wear coefficient variation model. By using these models for variable wear coefficient for both flat and cylinder, the difference of wear characteristics, plastic strain, and stress between variable wear coefficient model (VWCM) and constant wear coefficient model (CWCM) are analyzed. The results show that the variable wear coefficient has no significant effect on the wear characteristic at the end of the process in the gross sliding regime. However, in the partial slip regime, the effect of variable wear coefficient on wear characteristics is significant. Due to the difference in contact geometry in the fretting process between VWCM and CWCM, the tangential and shear stress and equivalent plastic strain also show differences during the fretting process.
微动磨损是一种常见现象，当接触部件之间存在振荡相对运动时就会发生。为了研究微动过程中的磨损特性历程，有限元法（FEM）通常被用于通过在模型中考虑磨损来模拟微动。在大多数文献中，磨损系数被视为常数，但根据实验结果这并非实际情况。为了考虑磨损系数的变化，本文应用了双线性模型，并在磨损系数变化模型的研究中考虑了摩擦学转变结构（TTS）相。通过将这些模型用于平面和圆柱的可变磨损系数，分析了可变磨损系数模型（VWCM）和恒定磨损系数模型（CWCM）之间在磨损特性、塑性应变和应力方面的差异。结果表明，在总体滑动状态下，可变磨损系数在过程结束时对磨损特性没有显著影响。然而，在部分滑移状态下，可变磨损系数对磨损特性的影响是显著的。由于VWCM和CWCM在微动过程中接触几何形状的差异，在微动过程中切向应力、剪应力和等效塑性应变也表现出差异。
