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http://dx.doi.org/10.3795/KSME-A.2012.36.6.609

Effects of Laser Source Geometry on Laser Shock Peening Residual Stress  

Kim, Ju-Hee (Korea Military Academy)
Kim, Yun-Jae (Korea University)
Kim, Joung-Soo (Korea Atomic Energy Research Institute(KAERI))
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.36, no.6, 2012 , pp. 609-615 More about this Journal
Abstract
In LSP (laser shock peening) treatment, the laser source geometries when the laser beam strikes the metal target area are diverse. The laser spot geometry affects the residual stress field beneath the treated surface of the metallic materials, which determines the characteristics of the pressure pulse. In this paper, detailed finite-element (FE) simulations on laser shock peening have been conducted in order to predict the magnitude and of the residual stresses and the depth affected in Inconel alloy 600 steel. The residual stress results are compared for circular, rectangular, and elliptical laser spot geometries. It is found that a circular spot can produce the maximum compressive residual stresses near the surface but generates tensile residual stresses at the center of the laser spot. In the depth direction, an elliptical laser spot produces the maximum compressive residual stresses. Circular and elliptical spots plastically affect the alloy to higher depths than a rectangular spot.
Keywords
FE Analysis; LSP(Laser Shock Peening); Ablative Layer; Water Tamping Layer; Plasma; Dynamic Yield Strength; Infinite Element; Laser Source;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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