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Stable and unstable friction in fretting contacts

Research output: Contribution to journalArticleScientificpeer-review


Original languageEnglish
Pages (from-to)73-82
Number of pages10
JournalTribology International
Early online date2018
Publication statusPublished - 1 Mar 2019
Publication typeA1 Journal article-refereed


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.


  • Fretting, Friction, Stick-slip, Wear

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Field of science, Statistics Finland

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