Maier Enzo, Lengmüller Moritz, Lohner Thomas
Gear Research Center (FZG), Department of Mechanical Engineering, School of Engineering and Design, Technical University of Munich, Boltzmannstr. 15, D-85748 Garching near Munich, Germany.
Polymers (Basel). 2022 Aug 26;14(17):3507. doi: 10.3390/polym14173507.
Fiber-reinforced materials or 3D printed parts feature transversely isotropic elasticity. Although its influence on pressures, shapes, and sizes has been studied extensively for dry contacts, the transferability to lubricated contacts is fragmented. This numerical study investigates how the content and orientation of short fibers in fiber-reinforced polymers (FRP) affect elastohydrodynamic lubrication (EHL) of point contacts. Material properties are modeled with Tandon-Weng homogenization. For EHL modeling, a fully-coupled approach based on finite element discretization is used. Results on hydrodynamic pressure and film thickness as well as material stress distribution are analyzed and compared to common approximations using the effective contact moduli. It is shown that the combination of fiber content and orientation defines the effective contact stiffness that determines the contact shape, size, and film thickness. Furthermore, the contact regime can change if a contact-specific stiffness threshold is reached.
纤维增强材料或3D打印部件具有横向各向同性弹性。尽管其对干接触的压力、形状和尺寸的影响已得到广泛研究，但向润滑接触的可转移性研究仍不完整。本数值研究探讨了纤维增强聚合物（FRP）中短纤维的含量和取向如何影响点接触的弹流润滑（EHL）。材料特性采用Tandon-Weng均匀化模型。对于EHL建模，使用了基于有限元离散化的全耦合方法。分析了流体动压力、膜厚以及材料应力分布的结果，并与使用有效接触模量的常用近似值进行了比较。结果表明，纤维含量和取向的组合定义了有效接触刚度，该刚度决定了接触形状、尺寸和膜厚。此外，如果达到特定接触刚度阈值，接触状态可能会发生变化。
