Abstract
Abstract Designing contacts susceptible to fretting is a challenging task due to uncertainties related to friction. For example, coefficient of friction has shown to vary as a function of load cycles and so-called non-Coulomb friction can exist during individual load cycles. Concepts of stable and unstable friction are presented in this manuscript. Based on experiments, no fretting is to be expected if the utilization of friction is kept below unstable friction threshold. If contact is subjected to tangential load above this threshold, reciprocating slippage, fretting, is to be expected even if the contact was initially in stick. Experimental evidence for existence of such threshold is presented in form of friction data, slip data and fretting scars.
Highlights
Fretting stands for reciprocating surface sliding and wear and fatigue damage associated with it
This study aims to find out how much of the available friction can be utilized before friction starts to show unstable behaviour, observed previously in gross sliding fretting experiments, and when fretting damage starts to occur
Fretting experiments were only a fraction of the available friction was used in order to study friction instability phenomenon previously measured in gross sliding conditions using dry quenched and tempered steel fretting contact
Summary
Fretting stands for reciprocating surface sliding and wear and fatigue damage associated with it. The slip amplitude is low, in range of few micrometers; it can be tens or even hundreds of micrometers. Fretting wear is characterized by occurrence of finely textured wear debris, which tends to entrap inside the contact. Fretting fatigue is considered especially harmful due to potentially catastrophic component failures and by the fact that fretting fatigue failure initiates inside the contact and is difficult to be observed. Fretting induced surface degradation accelerates fatigue crack initiation, making evaluation of fretting fatigue loads difficult. A more comprehensive description of fretting and contacts is available in these Refs [1,2,3]
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