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Fatigue life prediction of scratch damaged shot peened components

R.A. Cláudio (Department of Mechanical Engineering, Instituto Politécnico de Setúbal, Setúbal, Portugal and ICEMS, Instituto Superior Técnico, UTL, Lisboa, Portugal)
J.M. Silva (AeroG/LAETA – Aeronautics and Astronautics Research Center, University of Beira Interior, Covilhã, Portugal)
J. Byrne (Department of Mechanical and Design Engineering, University of Portsmouth, Portsmouth, UK)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 16 November 2012

281

Abstract

Purpose

This paper aims to present a methodology, based on traditional approaches, to predict the fatigue life and non‐propagating cracks of shot peened components and the damaging effect of a scratch created over the treated surface.

Design/methodology/approach

The finite element method is used to determine the actual strain at surface and fracture mechanics parameters calculated from cracks at the surface. The model considers residual stress (in order to introduce the effect of shot peening) and the scratch geometry. The total fatigue life is obtained by adding initiation life, to early and long crack propagation life using appropriate criteria.

Findings

Numerical predictions were compared with previous experimental tests, showing that this method is quite reliable for predicting both fatigue life and non‐propagating cracks of shot peened components, including the effect of damage due to a scratch.

Research limitations/implications

The proposed method provides good results and a clear understanding of the fatigue process, however it requires a considerable amount of both material and shot peening parameters.

Practical implications

The methodology presented in this paper allows the determination of fatigue life and the prediction of non‐propagating cracks for components, including the effects of shot peening and scratch damage. These results can be used to quantify the scratch damage limits of components improved by shot peening.

Originality/value

This paper provides a useful tool for prediction of the effects of shot peening and scratch damage on fatigue life, using traditional approaches.

Keywords

Citation

Cláudio, R.A., Silva, J.M. and Byrne, J. (2012), "Fatigue life prediction of scratch damaged shot peened components", International Journal of Structural Integrity, Vol. 3 No. 4, pp. 396-408. https://doi.org/10.1108/17579861211281191

Publisher

:

Emerald Group Publishing Limited

Copyright © 2012, Emerald Group Publishing Limited

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