Working Paper Article Version 1 This version is not peer-reviewed

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

Version 1 : Received: 14 August 2021 / Approved: 18 August 2021 / Online: 18 August 2021 (10:51:34 CEST)

A peer-reviewed article of this Preprint also exists.

Kim, R.; Suh, J.; Shin, D.; Lee, K.-H.; Bae, S.-H.; Cho, D.-W.; Yi, W.-G. FE Analysis of Laser Shock Peening on STS304 and the Effect of Static Damping on the Solution. Metals 2021, 11, 1516. Kim, R.; Suh, J.; Shin, D.; Lee, K.-H.; Bae, S.-H.; Cho, D.-W.; Yi, W.-G. FE Analysis of Laser Shock Peening on STS304 and the Effect of Static Damping on the Solution. Metals 2021, 11, 1516.

Abstract

Laser shock peening is a process which can reduce stress corrosion cracking and improve fatigue life by forming compressive residual stress on the surface of the material. In a computational FE simulation of laser shock peening, during applying the pressure load generated by the laser pulse to the surface of simulation geometry, the peening is simulated by explicit analysis and then convert to implicit analysis to dissipate the dynamic energy remaining in the geometry. In this study, static damping is applied to dissipate residual dynamic energy without converting it into an implicit analysis. The compressive residual stress distribution is compared between the simulation results for the stainless steel 304 material and the same material subjected to actual laser shock peening. The laser shock peening parameters were 4.2J laser pulse energy, 50% overlap of 3mm diameter of the laser beam and water as a confinement layer. As a result, the compressive residual stress from the surface to the depth direction is similar to both the simulation and the experimental result measured by the hole drilling method.

Keywords

Laser shock peening; FE simulation; Residual stress; Minimum principal stress; Static damping

Subject

Engineering, Mechanical Engineering

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