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Analysis of plasma thermal surface effects on the residual stress field induced by LSP in Al2024-t351

M. MORALES1,* , J. A. PORRO1, C. MOLPECERES1, M. HOLGADO1, J. L. OCAÑA1

Affiliation

  1. Centro Láser UPM. Universidad Politécnica de Madrid, Campus Sur UPM. Edificio La Arboleda Ctra. de Valencia, km. 7,300, 28031 Madrid, Spain

Abstract

In Laser Shock Processing (LSP) a high intensity pulsed laser beam is focused at the interface between a metallic target and a transparent confining material (normally water) that induces a residual stress distribution in the target material. Without a protective coating thermal effects are present near the target surface. A calculational model has been developed, able to systematically study LSP processes, starting from laser-plasma interaction and coupled thermo-mechanical target behavior. We present results obtained in LSP treatments without coating. In particular 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; repeated pulses increase maximum compressive residual stress and the depth of the compressive residual stress region; compressive residual stresses very close to the surface level can be induced even without any protective coating through the application of adjacent pulses..

Keywords

Plasma, Laser shock processing, Surface treatment, Shock waves, Residual stress, Numerical modeling.

Submitted at: June 30, 2009
Accepted at: Feb. 27, 2010

Citation

M. MORALES, J. A. PORRO, C. MOLPECERES, M. HOLGADO, J. L. OCAÑA, Analysis of plasma thermal surface effects on the residual stress field induced by LSP in Al2024-t351, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 3, pp. 718-722 (2010)