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Experimental validation of simulated fatigue life estimates in laser‐peened aluminum

Thomas J. Spradlin (Mechanical and Materials Engineering, Wright State University, Dayton, Ohio, USA)
Ramana V. Grandhi (Mechanical and Materials Engineering, Wright State University, Dayton, Ohio, USA)
Kristina Langer (Air Force Research Lab, AFRL/RBSM, Wright‐Patterson Air Force Base, Ohio, USA)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 8 March 2011

551

Abstract

Purpose

The purpose of this paper is to develop and implement a structural fatigue life estimation framework that includes laser‐peened (LP) residual stresses and then experimentally validates these fatigue life estimations.

Design/methodology/approach

A three‐dimensional finite element analysis of an Al 7075‐O three‐point bending coupon being LP was created and used to estimate the fatigue life when loaded. Fatigue tests were conducted to validate these estimations.

Findings

The framework developed for fatigue life estimation of LP‐processed coupons yielded estimates with goodness‐of‐fit between the log‐transformed experimental and analytical data of R2=0.97 for the baseline coupons and R2=0.94 for the LP‐processed coupons.

Research limitations/implications

Approximated ε‐life fatigue parameters were used to calculate the fatigue life resulting from the complex residual stress fields due to the simulated LP process.

Originality/value

A fatigue life estimation framework that considers LP residual stress fields has been developed for use on structural components.

Keywords

Citation

Spradlin, T.J., Grandhi, R.V. and Langer, K. (2011), "Experimental validation of simulated fatigue life estimates in laser‐peened aluminum", International Journal of Structural Integrity, Vol. 2 No. 1, pp. 74-86. https://doi.org/10.1108/17579861111108635

Publisher

:

Emerald Group Publishing Limited

Copyright © 2011, Emerald Group Publishing Limited

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