Elastohydrodynamic lubrication model and failure test for micro-contact thermodynamic characteristics of friction interface

A micro-contact thermodynamic model is proposed to study the interfacial characteristics in wet friction pair based on Elastohydrodynamic Lubrication (EHL) theory. The study takes into account the asperity elastic-plastic deformation, establishing an improved model with high accuracy in verifications with experimental data and existing model. With this optimized micro-contact thermodynamic model, we systematically discussed the in-fluence of sliding speed, oil temperature, and average surface pressure on thermodynamic behaviors such as rough contact area, pressure distribution, and temperature distribution. Additionally, experimental in-vestigations revealed the complex failure mechanism of the friction disc. Specifically, during the failure process, the friction coefficient and the radial temperature difference gradually increase. The metal oxides form on the surface, and the graphite distribution is gradually dispersed.