Finite Element Analysis of Cylinder-flat Fretting Wear under Different Loading Conditions
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摘要: 在ABAQUS中建立柱面/平面微动磨损模型，设置不同的加载条件，分析接触区域的接触应力和相对滑移距离，获得了区分两种滑移状态的临界函数。结合能量模型和FORTRAN语言编写适用于本模型的UMESHMOTION子程序，实现了磨损表面节点的动态更新，建立了动态磨损模型。通过对不同情况下磨损深度和磨损体积的仿真分析，获得结论：随循环次数的增加，磨损深度、磨损宽度和磨损体积都随着增大，部分滑移状态的磨损体积远小于完全滑移状态的磨损体积；循环次数和法向载荷为定值时，随位移幅值的增加，磨损宽度、磨损深度和磨损体积都随着增大，部分滑移状态的磨损体积很小且增长缓慢，完全滑移状态的磨损体积增长迅速；循环次数和位移幅值为定值时，在完全滑移状态，随法向载荷的增加，磨损深度和磨损体积先增大再减小；在磨损体积先增大再减小的过程中，存在一个最大值，对应的法向载荷和位移幅值称为危险加载条件，通过揭示不同位移幅值时危险加载条件的变化规律，为避免该条件的出现提供了理论依据。
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关键词:
- 柱面/平面接触 /
- 微动磨损 /
- 能量模型 /
- UMESHMOTION子程序 /
- 动态磨损模型
Abstract: A cylinder-flat fretting wear model is established based on ABAQUS software. The critical function of the two sliding conditions was obtained by analyzing the contact stress and the relative slip distance of the contact area under different loading conditions. The UMESHMOTION subroutine is written via energy model and FORTRAN language to obtain the dynamic updating of the wear surface nodes and the dynamic wear model is established. After the simulation analysis of the wear depth and wear volume under different conditions, the results demonstrated that the wear width, wear depth and wear volume increase by the number of cycles increase, and the wear volume in the partially slipping condition is much smaller than the wear volume in the gross slip condition. It is also found that the wear width, wear depth and wear volume increase by raising the displacement amplitude, but the wear volume in the partial slip condition is small and increases slowly, the gross slip condition follows the opposite trend when the number of cycles and the normal load are constant. Moreover, when the number of cycles and the displacement amplitude are fixed, the wear depth and the wear volume firstly increase and then decrease as the normal force under gross slip condition increases. The normal load and displacement amplitude that make the wear depth and wear volume to reach the maximum value are defined as the dangerous loading condition. Therefore, the variation rule of the dangerous loading condition at different displacement amplitude is revealed, which provides the theoretical basis for avoiding the occurrence of the dangerous loading condition.-
Key words:
- cylinder-flat contact /
- fretting wear /
- energy model /
- UMESHMOTION subroutine /
- dynamic wear model
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表 2 两种滑移状态的加载条件
滑移状态 法向载荷 位移幅值 加速次数 磨损系数 部分滑移 20 MPa 4 μm 1 000 3.33×10-8 MPa-1 完全滑移 20 MPa 7 μm 1 000 3.33×10-8 MPa-1 
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