Effect of Particles on Lubricated Friction - Verification of Dead Time Phenomenon and Friction Theory

In an attempt to reveal the mechanism of friction generated by solid particles in oil, this study verified the theoretical analysis of friction generation that the authors reported previously (Tomimoto and Mizuhara (1999), Mizuhara et al. (2000)). These previous studies performed theoretical and experimental analysis on the assumption that particles that generate friction (interference particles) were larger than the minimum oil film thickness. In the authors previous work, they proposed a model of dead time (non interference) phenomenon to describe a phenomenon that friction force was saturated along with an increase in the number of interference particles. It was revealed that friction force, generated by particles at a constant load while varying sliding velocity and interference particle concentration, could be expressed with three parameters, namely the number of interference particles, load supported by an interference particle and interference time. In the present study, the authors performed exper...