The mixed regime and wear mechanism of elliptical contact in the start-up process considering interface material properties: A theoretical prediction

Abstract

Abstracts The start-up motion is the significant process of many mechanical applications especially for high-frequency start-stop equipment; the formation of separating film and the main wear approximately occur in this process. In this paper, the improved mixed algorithm and a new methodology of describing Gaussian rough surface are developed and theoretically validated based on Stribeck curve. Furthermore, the transient film formation of smooth contact and rough contact with the start-up motion is analyzed and validated. Finally, the wear mechanism of different friction pairs is investigated, meanwhile, the applicability of Evans model and Archard model is evaluated. Results show that the contact ratio of smooth contact is considerably large but the transition time is much short in comparison with rough contact because the valleys of rough surface conserve lubricant avoiding solid contact. Combining the Evans equation and this mixed technique, the wear volume and wear rate were successfully calculated. The type of friction pair influences greatly the wear volume and wear rate of contact surfaces. The wear volume and wear rate of TiN–TiN the minimum in the start-up process, and alumina ceramics with satisfactory fracture toughness is a potential coating that can be applied to mechanical elements with a wide range of slide-roll ratio.