Friction and Temperature Behavior of Lubricated Thermoplastic Polymer Contacts
Friction and Temperature Behavior of Lubricated Thermoplastic Polymer Contacts
复制标题
DOI：
10.3390/lubricants8060067
复制
发表时间：
2020-06-01
期刊：
影响因子：
3.5
通讯作者：
Stahl, Karsten
中科院分区：
文献类型：
--
作者：
Reitschuster, Stefan;Maier, Enzo;Stahl, Karsten
本文研究了滚动-滑动条件下热弹流润滑接触的摩擦和温度特性。为此，我们使用了一个双圆盘试验台，并将普通和纤维增强聚酰胺（PA）66和聚醚醚酮（PEEK）圆盘与表面硬化钢圆盘和三种不同的润滑剂配对。实验研究包括各种润滑制度，通过改变和速度和油温，以及负载和滑移率。在热塑性TEHL接触件中测得的摩擦在高流体负载部分的区域中特别低，这是指顺应性聚合物表面的大变形。牛顿流体的流动特性主要决定了流体的摩擦力。聚合物的低热扩散性使接触绝缘，并可进一步降低有效润滑剂粘度，从而降低流体摩擦。对于低的和速度，固体摩擦的影响取决于固体负载部分的摩擦学行为。虽然界面接触摩擦非常小，但材料阻尼强烈地有助于功率损耗并增加本体温度，这反过来又影响TEHL接触。因此，加载频率和由此产生的整体温度被确定为润滑的热塑性聚合物接触的功率损耗和摩擦学行为的主要驱动因素之一。
This work focuses on the friction and temperature behavior of thermo-elastohydrodynamically lubricated (TEHL) contacts under rolling-sliding conditions. For this purpose, a twin-disk test rig is used with a hybrid setup of plain and fiber-reinforced polyamide (PA) 66 and polyetheretherketone (PEEK) disks paired with case-hardened steel disks and three different lubricants. Experimental investigations include various lubrication regimes by varying sum velocity and oil temperature as well as load and slip ratio. The measured friction in thermoplastic TEHL contacts is particularly very low in the area of high fluid load portion, which refers to the large deformation of the compliant polymer surface. Newtonian flow behavior mainly determines fluid friction. The low thermal effusivity of polymers insulates the contact and can further reduce the effective lubricant viscosity, and thus the fluid friction. For low sum velocities, solid friction influences the tribological behavior depending on the solid load portion. Although the interfacial contact friction is comparably small, material damping strongly contributes to power losses and increases bulk temperature, which in turn affects the TEHL contact. Thus, loading frequency and the resulting bulk temperature are identified as one of the main drivers of power losses and tribological behavior of lubricated thermoplastic polymer contacts.