Abstract
Both wear and fatigue occur in fretting condition, and they interact with one another during the whole process. Fretting fatigue is commonly analysed without considering the effect of wear in partial slip regime, although wear affects the lifetime of crack initiation. This paper investigates, for the first time, the effect of wear debris on fretting fatigue crack initiation. To investigate the effect of debris, first fretting wear characteristics in partial slip regime are analysed for loading conditions. Then, the effect of wear on fretting fatigue crack initiation is investigated using Ruiz parameters and critical plane methods without considering the debris effect. Through the results, we can see that loading conditions affect the wear profiles in different ways. Moreover, wear has a significant effect on the fatigue in partial slip regime without considering debris especially on the crack initiation location. Finally, considering wear debris in the analysis, its effect on critical plane parameters is investigated. It is found that by considering the wear debris effect, the fretting fatigue crack initiation location is shifted towards the trailing edge. The predictions of both crack initiation location and lifetime show a good agreement with the experimental data.
Highlights
Fretting is the phenomenon that happens between two contact parts when there is a relative slip between them and pressure on the contact surface [1,2,3]
This paper analysed the effect of fretting wear debris on fretting fatigue crack initiation and the critical plane parameters
3) As wear can affect fretting fatigue crack initiation, the predicted lifetime considering the effect of wear tends to be better than that without considering it as in Ref. [18] and all the predicted data lies in the ±2Ni
Summary
Fretting is the phenomenon that happens between two contact parts when there is a relative slip between them and pressure on the contact surface [1,2,3]. Madge et al [22, 23] analysed the critical role of wear on fatigue in fretting for both gross slip regime and partial slip regime They found that the competence between the wear and fatigue crack initiation on the contact surface was significant and that the wear had alleviated the fatigue damage initiation significantly. Hattori and Watanabe [31] investigated the effect of wear on crack propagation in fretting fatigue specimen based on stress intensity factor by both finite element method (FEM) and experiments. They found that the fatigue strength decreased with the evolution of the wear profiles.
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