滚动工况点接触边界润滑油膜厚度的接触电阻法测量技术研究OA

A precision rolling test module based on a ball-on-disk tribometer was developed to measure oil film thickness under boundary lubrication using the contact resistance method.The theoretical relationship between contact resistance and film thickness for point contact was derived from electrical contact and tribological theories,and its applicability under dynamic rolling conditions was experimentally validated.After calibrating the contact resistance under dry rolling to eliminate systematic errors,rolling lubrication tests were conducted under various loads and speeds to obtain dynamic contact resistance.The measured contact resistance was below 10 kΩ in boundary and mixed lubrication regimes,with a repeatability of 84 Ω.Oil film thickness was simultaneously measured using the optical interference method with a resolution of 0.8 nm.By correlating contact resistance with film thickness under identical operating conditions,a dynamic contact resistance-film thickness model for point-contact rolling under medium loads was established,achieving a goodness of fit of 0.96.The results demonstrate the feasibility of applying the contact resistance method to practical point-contact rolling lubrication conditions.