Time-dependence and exposure-dependence of material removal rates in fretting

• Published in: Wear Vol. 477; p. 203826
• Main Author: Shipway, P.H.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 18.07.2021; Elsevier Science Ltd
• Subjects: Chemical reactions; Debris; Fretting; Fretting corrosion; Mapping; Mechanisms; Modelling; Rate-determining process (RDP); Time dependence; Wear rate; Mechanisms; Modelling; Mapping; Debris; Rate-determining process (RDP)
• ISSN: 0043-1648; 1873-2577
• DOI: 10.1016/j.wear.2021.203826

Fretting generally results in either material removal or fatigue, or a combination of both. Although the term is rarely used now, in the early literature addressing this subject, fretting that resulted in material removal was sometimes termed “fretting corrosion” on account of the characteristic oxide debris that emanated from such contacts, with this description itself encapsulating the understanding that the material removal has both a mechanical and a chemical nature. When the mechanical aspects of material removal in fretting dominate in the interpretation of the results, wear rates tend to be presented in terms of volume loss for a given exposure to wear (often measured by number of fretting cycles, total distance of sliding or energy dissipated). However, it is well understood that, in fretting, some aspects related to the formation of oxide-based debris are time-dependent (such as transport of species into and out of the contact and chemical reactions which take place at the contact surface) and this raises issues as to how to best present rate data associated with material removal. In this paper, recommendations are made as to how to be present volume loss data in fretting in a way that assists in the development of understanding of the rate-determining processes in material removal in fretting. •Mechanical and chemical effects in fretting are addressed.•Graphical presentation of wear data is considered.•Time-based wear rates are used to identify competing processes.•Re-analysis of data points to the existence of rate determining processes.