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Thermomechanical modelling of stress fields in metallic targets subject to laser shock processing

Miguel Morales (Centro Láser UPM, Universdad Politécnica de Madrid, Madrid, Spain)
Carlos Correa (Centro Láser UPM, Universdad Politécnica de Madrid, Madrid, Spain)
Juan Antonio Porro (Centro Láser UPM, Universdad Politécnica de Madrid, Madrid, Spain)
Carlos Molpeceres (Centro Láser UPM, Universdad Politécnica de Madrid, Madrid, Spain)
José Luis Ocaña (Centro Láser UPM, Universdad Politécnica de Madrid, Madrid, Spain)

International Journal of Structural Integrity

ISSN: 1757-9864

Article publication date: 8 March 2011

513

Abstract

Purpose

Laser shock peening (LSP) is mainly a mechanical process, but in some cases, it is performed without a protective coating and thermal effects are present near the surface. The numerical study of thermo‐mechanical effects and process parameter influence in realistic conditions can be used to better understand the process.

Design/methodology/approach

A physically comprehensive numerical model (SHOCKLAS) has been developed to systematically study LSP processes with or without coatings starting from laser‐plasma interaction and coupled thermo‐mechanical target behavior. Several typical results of the developed SHOCKLAS numerical system are presented. In particular, the application of the model to the realistic simulation (full 3D dependence, non‐linear material behavior, thermal and mechanical effects, treatment over extended surfaces) of LSP treatments in the experimental conditions of the irradiation facility used by the authors is presented.

Findings

Target clamping has some influence on the results and needs to be properly simulated. An increase in laser spot radius and an increase in pressure produces an increase of the maximum compressive residual stress and also the depth of the compressive residual stress region. By increasing the pulse overlapping density, no major improvements are obtained if the pressure is high enough. The relative influence of thermal/mechanical effects shows that each effect has a different temporal scale and thermal effects are limited to a small region near the surface and compressive residual stresses very close to the surface level can be induced even without any protective coating through the application of adjacent pulses.

Originality/value

The paper presents numerical thermo‐mechanical study for LSP treatments without coating and a study of the influence of several process parameters on residual stress distribution with consideration of pulse overlapping.

Keywords

Citation

Morales, M., Correa, C., Porro, J.A., Molpeceres, C. and Luis Ocaña, J. (2011), "Thermomechanical modelling of stress fields in metallic targets subject to laser shock processing", International Journal of Structural Integrity, Vol. 2 No. 1, pp. 51-61. https://doi.org/10.1108/17579861111108617

Publisher

:

Emerald Group Publishing Limited

Copyright © 2011, Emerald Group Publishing Limited

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