基于海水介质的微型面接触摩擦副应力及摩擦学研究

Study on Stress and Tribology of Micro Contact Surface in Seawater

为了研究微型面接触摩擦副在海水环境中的动力学和摩擦学性能,根据柱塞运动过程无刚性冲击和柔性冲击的准则,选取了B样条曲线、五次多项式曲线和正弦曲线作为研究对象,计算了微型面接触摩擦副接触应力以及摩擦应力;以动力学计算的结果对摩擦试验进行加载,筛选摩擦副材料。结果表明三种曲线组成的摩擦副接触应力最大值约为160 MPa,摩擦应力最大值均约为16 MPa,B样条曲线和正弦曲线综合力学性能优于五次多项式曲线。通过销盘摩擦试验考察了在初始接触应力约为160 MPa,滑动速度为0.5 m/s的工况下,纯PEEK、含有30%玻璃纤维的PEEK和分别含有10%石墨/碳纤维/PTFE的PEEK与17-4PH组成摩擦副的摩擦学性能。试验结果表明分别含有10%石墨/碳纤维/PTFE的PEEK与17-4PH摩擦副的摩擦因数和磨损量均最小,磨损机理为轻微的粘着磨损,可作为微型面接触摩擦副滚动体材料。

In order to study the dynamic and tribological performance of micro contact surface in seawater, by the goals of no stiff impact and flexible impact, study focus on the contact pressure and tribological stress of B-spline curve, quantic polynomial curve and sine curve, and the friction experiments were carried out, with the results to select the material of friction pair. The results shows that the maximum contact stress is about 160 MPa, the maximum tribological stress is about 16 MPa. Moreover, the mechanical performance of B-spline curve and sine curve is better than quantic polynomial curve. The tribological behavior, of three kinds PEEK composites(pure PEEK, 30% glass fiber PEEK and 10% graphite/10% carbon fiber/10%PTFE PEEK) coupled with 17-4 PH, were compared under seawater by pin-on-disc friction test, the operating condition is about 160 MPa and 0.5 m/s, results indicates that the wear and friction coefficient of 10% graphite/10% carbon fiber/10%PTFE PEEK and 17-4 PH friction pair is minimum, the main mechanism is light abrasive wear, so 10% graphite/10% carbon fiber/10%PTFE PEEK composite is suitable for micro contact surface.