FE Analysis of Laser Shock Peening on STS304 and the Effect of Static Damping on the Solution

Metals

Jeong Suh¹  Dae-Won Cho¹  Ryoonhan Kim¹  Kwang-Hyeon Lee¹  Dongsig Shin¹  Seung-Hoon Bae¹  Won-Geun Yi² 

[1] Busan Machinery Research Center, Korea Institute of Machinery and Materials, Busan 46744, Korea;Doosan Heavy Industries, Changwon 51711, Korea;

关键词: laser shock peening;    FE simulation;    residual stress;    minimum principal stress;    static damping;   

DOI  :  10.3390/met11101516

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown