10.1088/2631-8695/ab35a5">
 

Integrated Finite Element & Optimization Model for Laser Shock Pressure Impulse Shape Determination

Document Type

Article

Publication Date

8-2019

Abstract

Laser shock peening (LSP) is a method of work hardening used to improve fatigue life. Finite element (FE) modeling of LSP lacks confidence, primarily due to the unknown shape of the acting pressure impulse in both time and space. This work developed and tested an integrated FEM/optimization model to determine a 'best fit' pressure impulse shape based on easy to measure surface displacement and residual stress data from a single LSP burst. Isight optimization software was used in conjunction with Abaqus FEM, MATLAB, and Excel to utilize the Hooke-Jeeves optimization algorithm for data matching. Favorable algorithm parameters were determined for a discretized optimization space then applied to the continuous optimization space to match FEM generated target data. Residual stress results matched to within 4.5% maximum difference, and surface displacement results matched to within 2.5% maximum difference. This modeling tool shows great potential for use in matching test data from LSP treated specimens, resulting in improved FEM confidence for engineering design application.

Comments

© 2019 Not subject to copyright in the USA. Contribution of [Air Force Institute of Technology]

The "Link to Full Text" on this page opens or saves the PDF of the full published article, as hosted at the publisher website.

[*] Author C. Engebretsen was enrolled in an AFIT doctoral program at the time of publication.

Source Publication

Engineering Research Express

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