Sensitivity Analysis Of Parameters Of Johnson-Cook Hardening And Mie-Gruneisen Eos Model For Lsp Finite Element Analysis

Laser shock peening(LSP) is an effective surface-treatment technique that uses a high-energy laser pulse generated from a high-pressure and high-temperature plasma. Laser shock waves generate compressive residual stresses on and underneath the surface of a metallic material. Through the rapid expansion of the high temperature plasma, LSP also successfully improves the fatigue performance of metallic components. When the metal surface is shocked with a high-speed laser pulse, a specific flow phenomenon temporarily occurs and the stress-strain relation ceases to be linear. Previous research has not considered both strain hardening and flow phenomena, whereas other studies have conducted LSP simulation analyses. In this study, we applied finite element analysis to an LSP simulation method in order to understand and discuss material hardening and flow characteristics. A sensitivity analysis of the main parameters of Johnson-Cook hardening was performed and the Mie-Gruneisen EOS model was applied to produce a new LSP simulation method for comparison with previous LSP analytical methods.