Hofmann Stefan, Maier Enzo, Lohner Thomas
Gear Research Center (FZG), Department of Mechanical Engineering, School of Engineering and Design, Technical University of Munich, Boltzmannstraße 15, 85748 Garching, Germany.
Polymers (Basel). 2022 Oct 18;14(20):4398. doi: 10.3390/polym14204398.
The influence of the complex material behavior of thermoplastic polymers in lubricated contacts is poorly understood. It affects the optimal design of power-transmitting thermoplastic machine elements and the exploitation of its potential, e.g., lightweight design, low-noise operation, and cost-effective manufacturing when injection-molded. This study applies the in situ thin-film sensor technology on a twin-disk tribometer in order to study the elastohydrodynamic lubrication of rolling-sliding contacts with the thermoplastic polymer polyetheretherketone. The results provide insights into the effects and relevance of its thermoplastic material properties. Pressure measurements reveal a typical hydrodynamic profile in combination with a large deformation of the contact zone. The influence of speed and slip ratio is thereby negligible. The temperature rise is low compared to elastohydrodynamically lubricated contacts with steel and is mainly influenced by the slip ratio as well as the load, whereas speed plays a subordinated role. In general, the heat generation is governed by shearing and backflow in the contact inlet zone at low slip ratios and shearing in the contact zone at high slip ratios. No effects attributed to viscoelasticity or loading frequency were observed at the operating conditions considered.
热塑性聚合物在润滑接触中的复杂材料行为的影响尚未得到充分理解。这影响了动力传输热塑性机械元件的优化设计及其潜力的开发，例如轻量化设计、低噪声运行以及注塑成型时的经济高效制造。本研究将原位薄膜传感器技术应用于双盘摩擦磨损试验机，以研究热塑性聚合物聚醚醚酮在滚动 - 滑动接触中的弹流润滑。结果揭示了其热塑性材料特性的影响及相关性。压力测量显示出典型的流体动力分布以及接触区的大变形。速度和滑移率的影响可忽略不计。与钢的弹流润滑接触相比，温度升高较低，主要受滑移率和载荷影响，而速度起次要作用。一般来说，在低滑移率下，热量产生由接触入口区的剪切和回流控制，在高滑移率下由接触区的剪切控制。在所考虑的运行条件下，未观察到粘弹性或加载频率的影响。
