二维粗糙面间滑动摩擦过程中平稳性研究

Study on the stability in the process of sliding friction for 2D rough surfaces

基于现有的分形模型,考虑到黏着现象的普遍性,通过在界面引入黏着剪切强度并考虑材料断裂,建立了考虑黏着、弹塑性变形影响的二维分形金属粗糙面间的滑动摩擦模型,并运用有限元软件进行数值求解。通过设置不同界面剪切强度及滑动速度参数,研究了两粗糙面间滑动过程中的平稳性。对建立的二维双粗糙弹塑性分形模型的实例进行分析,结果表明:当界面剪切强度较小时,法向速度波动幅值增大;当界面剪切强度增大到一定值后,法向速度波动幅值迅速的减小,使滑动较为平稳。滑动速度对平稳性的影响较大,滑动速度越大,滑动过程中振动越剧烈。

Based on existing fractal models and interface adhesion shear strength and allowing material failure,it establishes the sliding friction model of 2D fractal rough metal surfaces with the effect of adhesion and elastic-plastic deformation,uses finite element software to numerical solution. On the basis of this,it analyzes the stability of the sliding process under the different interface shear strength and sliding velocity parameters between the two rough surfaces. The results show that： when the interface shear strength is small,the wave amplitude of normal speed is large,the wave amplitude of normal speed decreases quickly and guarantees the sliding process stable when the interface shear strength is increased to a certain value. The sliding velocity has a great impact on the stability. With sliding velocity increasing,the vibration is fiercer.