Title: Effect of residual stress on stress intensity factors of fretting fatigue cracks

Authors: G.H. Farrahi, A. Mohajerani

Addresses: School of Mechanical Engineering, Sharif University of Technology, Azadi Ave., Tehran, Iran. ' School of Mechanical Engineering, Sharif University of Technology, Azadi Ave., Tehran, Iran

Abstract: The effect of compressive Residual Stress (RS) on the Stress Intensity Factors (SIFs) of fretting fatigue cracks was studied using semi-analytical methods. The fretting fatigue of a half-plane in contact with a flat rounded pad was taken into consideration, and RS such as those created by shot-peening were added to the model. Studies of several RS profiles were accomplished to consider the effect of changes in RS caused by stress relaxation during service or pretreatment and manufacturing discrepancies regarding parameters. The distribution of dislocations method was applied to the calculation of the SIFs of these cracks and was shown to be capable of dealing with these kinds of problems. It will be used effectively in future studies. In order to evaluate the stress state in the half-plane, contact mechanics calculations were accomplished without considering the presence of a crack, and the final results showed that this simplification does not create noticeable difficulties.

Keywords: fretting fatigue; residual stress; stress intensity factors; SIFs; distribution of dislocations; cracks; shot peening; contact mechanics; materials properties.

DOI: 10.1504/IJMMP.2007.014283

International Journal of Microstructure and Materials Properties, 2007 Vol.2 No.2, pp.164 - 177

Published online: 30 Jun 2007 *

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