Roupec Jakub, Jeniš Filip, Strecker Zbyněk, Kubík Michal, Macháček Ondřej
Faculty of Mechanical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic.
Materials (Basel). 2020 Oct 20;13(20):4670. doi: 10.3390/ma13204670.
The paper focuses on the coefficient of friction (COF) of a magnetorheological fluid (MRF) in the wide range of working conditions across all the lubrication regimes-boundary, mixed, elastohydrodynamic (EHD), and hydrodynamic (HD) lubrication, specifically focused on the common working area of MR damper. The coefficient of friction was measured for MR fluids from Lord company with concentrations of 22, 32, and 40 vol. % of iron particles at temperatures 40 and 80 °C. The results were compared with a reference fluid, a synthetic liquid hydrocarbon PAO4 used as a carrier fluid of MRF. The results show that at boundary regime and temperature 40 °C all the fluids exhibit similar COF of 0.11-0.13. Differences can be found in the EHD regime, where the MR fluid COF is significantly higher (0.08) in comparison with PAO4 (0.04). The COF of MR fluid in the HD regime rose very steeply in comparison with PAO4. The effect of particle concentration is significant in the HD regime.
本文重点研究了磁流变液（MRF）在所有润滑状态（边界润滑、混合润滑、弹流润滑（EHD）和流体动力润滑（HD））的广泛工作条件下的摩擦系数（COF），特别关注磁流变阻尼器的常见工作区域。测量了Lord公司生产的磁流变液在铁颗粒浓度为22%、32%和40%（体积分数），温度为40℃和80℃时的摩擦系数。将结果与一种用作磁流变液载液的参考流体——合成液态烃PAO4进行了比较。结果表明，在边界润滑状态和40℃温度下，所有流体的摩擦系数相似，为0.11 - 0.1
