Abstract
Laser shock peening creates compressive residual stress on the surface of the material, reducing stress corrosion cracking and increasing fatigue life. FE simulation of laser shock peening is an effective way to determine the mechanical effects on the material. In conventional FE simulations of laser shock peening, explicit analysis is used while pressure loads are applied and switched into implicit analysis to dissipate kinetic energy. In this study, static damping was adopted to dissipate kinetic energy without conversion into implicit analysis. Simulation of a single laser shock and multiple shocks was performed, and deformation and minimum principal stress were compared to evaluate the static damping effect. The history of the internal and kinetic energy were analyzed to compare the stabilization time depending on the damping value. Laser shock peening experiments were also performed on stainless steel 304 material. The residual stress of the specimen was measured by the hole drilling method and it was compared to the FE simulation result. The residual stress from the experiment and the simulation results showed similar distributions in the depth direction. Anisotropic residual stress distribution due to the laser path was observed in both results.
Highlights
IntroductionThe peening process generates a compressive residual stress field on the surface of a material
The compressive residual stress and the grain refinement generated by laser shock peening are known to increase the stress corrosion cracking resistance and fatigue life of the alloy [2,3]
The simulation result was compared with the laser shock peening (LSP) experiment specimen to determine whether the proposed simulation process is appropriate
Summary
The peening process generates a compressive residual stress field on the surface of a material. Shot peening and ultrasonic peening largely deform the material surface and generate the compressive residual stresses within a few micrometers of depth. Laser shock peening (LSP) is known to improve the fatigue life by 4 to 5 times compared to other peening processes by forming compressive residual stress at the depth of several millimeters from the material surface. The LSP generates compressive residual stress by a plasma shock induced by the reaction between a high-energy laser pulse and the material [1]. The compressive residual stress and the grain refinement generated by laser shock peening are known to increase the stress corrosion cracking resistance and fatigue life of the alloy [2,3]. Mechanical parts subjected to fatigue loads, such as turbine blades, or subjected to corrosive environments, such as welded parts in nuclear reactors, are the main applications for LSP [5]
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