Simulation‐based crack growth mitigation through optimum laser peened residual stress
International Journal of Structural Integrity
ISSN: 1757-9864
Article publication date: 24 August 2012
Abstract
Purpose
The purpose of this paper is to develop an approach to optimize the cycles‐to‐failure of a peened component with respect to laser peening (LP) variables: pressure magnitude, mid‐span, and spot size when the component is subject to a variable amplitude loading.
Design/methodology/approach
To optimally design an LP process, an experimentally validated 3D finite element simulation of the LP process, a cycles‐to‐failure estimation capability incorporating residual stress, and a particle swarm optimization strategy were developed and employed to maximize the cycles‐to‐failure of a component of a titanium turbine disk.
Findings
The most critical finding of this research is that a minor difference in the residual stress profile can lead to a large difference in the cycles‐to‐failure. This finding implies that selecting the optimization objective to be the cycles‐to‐failure is a better option as compared to the residual stress profile.
Research limitations/implications
The LP‐induced residual stresses are assumed static and do not change as number of load cycles increase.
Originality/value
The paper develops a framework that relates the LP variables and the cycles‐to‐failure of a peened component. A modified particle swarm optimization approach is developed to optimize the fatigue life of a turbine disk.
Keywords
Citation
Singh, G., Ocampo, J., Millwater, H. and Clauer, A. (2012), "Simulation‐based crack growth mitigation through optimum laser peened residual stress", International Journal of Structural Integrity, Vol. 3 No. 3, pp. 236-259. https://doi.org/10.1108/17579861211264361
Publisher
:Emerald Group Publishing Limited
Copyright © 2012, Emerald Group Publishing Limited