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Home  >  Journal list  >  Journal of the Society of Materials Science, Japan  >  Vol.56  No.12 (2007)  >  pp.1156-1162

Journal of the Society of Materials Science, Japan
<<Previous article Vol.56  No.12 (2007)   pp.1156 - 1162 Next article>>

Effect of Stress Relief Groove Shape on Fretting Fatigue Strength and Index for the Selection of Groove Shape

Yoshiyuki KONDO1), Masanobu KUBOTA1), Shunsuke KATAOKA2) and Chu SAKAE
1) Dept. of Intelligent Mach. and Systems, Kyushu Univ.
2) Graduate School, Kyushu Univ.

Stress relief groove has been used to improve the fretting fatigue strength of fitted part between mechanical components. However, the effect of groove has not been fully understood and there are not enough investigations to determine the optimal groove shape. In this study, the evaluation of fretting fatigue strength of specimens which have various shapes of stress relief groove was conducted by fretting fatigue tests and FEM analyses in order to find an index for the selection of groove shape. The groove shape was changed systematically with parameters of groove radius R and tangential angle θ. In the fretting fatigue test, fatigue limit of grooved specimen had a peak with increase of θ. The maximum improvement of fatigue limit was achieved at the transition point of the failure mode from the fretting fatigue at contact part to the fatigue at groove root. It was experimentally shown that fatigue limit had a good correlation with the parameter θd, where d is the groove depth. FEM analyses were done to understand the effect of stress relief groove. It was found that the fretting fatigue limit of grooved specimen could be evaluated using the peak axial stress near the contact edge. The estimation of fretting fatigue limit using a relationship between Kt/Kt0 and θd gave a good correlation with the experimental results and it would be a useful method to select the optimal groove shape.

Fretting fatigue, Stress-relief groove, FEM analysis, Stress concentration

Received: March 19, 2007
Published online: December 20, 2007
Copyright (c) 2007 by The Society of Materials Science, Japan



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