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Probabilistic sensitivity analysis of a laser peening fatigue life enhancement process

Gulshan Singh (Probabilistic Lab, General Electric – Global Research, Niskayuna, New York, USA)
Miguel Cortina (Mechanical Engineering Department, University of Texas at San Antonio, San Antonio, Texas, USA)
Harry Millwater (Mechanical Engineering Department, University of Texas at San Antonio, San Antonio, Texas, USA)
Allan Clauer (LSP Technologies, Dublin, Ohio, USA)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 24 August 2012

409

Abstract

Purpose

The purpose of this paper is to estimate probabilistic and regional importance sensitivities of fatigue life, with respect to the laser peening (LP) parameters applied to a Titanium turbine disk.

Design/methodology/approach

The sensitivities were calculated from Monte Carlo (MC) analysis of 21,000 simulations and probabilistic sensitivity methods.

Findings

The probabilistic sensitivity results indicate that the peak pressure and the mid‐span are the most important variables. The regional importance sensitivity results indicate that probability of failure is the most sensitive to the left tail of peak pressure and middle region of mid‐span and the fatigue life mean is the most sensitive to the left tails of the peak pressure and the mid‐span.

Practical implications

The sensitivity results of this research indicate that more time and energy should be focused on managing peak pressure and mid‐span, as compared to the remaining variables, to design and improve the laser peening process.

Originality/value

The paper presents four sensitivity analysis approaches which were formulated and employed to estimate fatigue life sensitivities with respect to the LP variables.

Keywords

Citation

Singh, G., Cortina, M., Millwater, H. and Clauer, A. (2012), "Probabilistic sensitivity analysis of a laser peening fatigue life enhancement process", International Journal of Structural Integrity, Vol. 3 No. 3, pp. 210-235. https://doi.org/10.1108/17579861211264352

Publisher

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Emerald Group Publishing Limited

Copyright © 2012, Emerald Group Publishing Limited

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