Abstract:

A two-dimensional sliding model of double rough surfaces was established, and the conditions for the fixed sliding speeds which considered adhesion factors in the process of contact. The friction and wear of sliding processes were analysed using the finite element analysis take into account elastic-plastic material properties with material failure. The wear rate and vibration were compared and analysed whether or not considering adhesive factors, the vibration power spectrum was obtained based on FFT arithmetic. The numerical results show that the average coefficient of friction is 0.48 when the interfacial shear strength τ=σy/3(where σy is the yield strength). In the case of considering adhesion, wear rate is larger, power spectrum low frequency component is more, vibration is relatively gentle, the corresponding energy also is larger. Compared with experimental results, it is concluded that the rationality of the simulation exists, these results also deepen understanding the physical image of the friction and wear processes.

Key words: sliding model;material failure;adhesive, coefficient of friction, fast fourier transform(FFT)

摘要：

建立了二维双粗糙体分形表面的接触模型，在固定滑动速度工况下考虑材料的磨损失效，针对是否考虑接触过程中的黏着因素，动态探讨了粗糙体在滑动过程中的摩擦磨损变化情况。运用有限元方法对滑动过程的摩擦磨损进行模拟仿真，得出考虑黏着因素的界面剪切强度τ=σy/3(σy为材料的屈服应力)时的摩擦因数平均值为0.48;对滑动过程是否考虑黏着因素的磨损率及振动情况进行分析比较，引入快速傅里叶函数对摩擦振动进行变换得到功率谱，结果发现，考虑黏着因素的情况下，相应的磨损率较大，功率谱低频成分较多，振动相对比较平缓，所需要的能量也相应比较大。将模拟仿真结果与实验进行比较，验证了模拟仿真的合理性，也加深了对摩擦磨损过程物理图像的理解。

关键词: 滑动接触模型, 损伤失效, 黏着, 摩擦因数, 快速傅里叶函数