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Optimizing Parameters with FEM Model for 20CrMnTi Laser Shocking.

Jie Sun1, Jiayuan Li1, Xiuyu Chen1

  • 1College of Marine Equipment and Mechanical Engineering, Jimei University, Xiamen 361000, China.

Materials (Basel, Switzerland)
|January 8, 2023
PubMed
Summary

Laser shock peening (LSP) uses finite element analysis to optimize surface treatment. This study determined optimal parameters for 20CrMnTi, achieving significant residual compressive stress for enhanced material properties.

Keywords:
finite elementlaser shockplastic strainresidual stressesshock parameterssingle-point

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Area of Science:

  • Materials Science
  • Surface Engineering
  • Mechanical Engineering

Background:

  • Laser shock peening (LSP) is an advanced surface treatment technique.
  • It involves overlaying single-point laser shocks to create a multi-point impact surface.
  • Understanding the mechanical response of materials to LSP is crucial for optimizing its application.

Purpose of the Study:

  • To develop and validate a finite element model for single-point laser shock.
  • To investigate the effects of varying laser shock parameters on the stress field and deformation of 20CrMnTi.
  • To determine optimal process parameters for LSP on 20CrMnTi.

Main Methods:

  • Finite element method (FEM) was employed to model single-point laser shock.
  • The FEM model was experimentally validated, showing less than 20% difference in residual stresses.
  • Simulations analyzed stress and deformation of 20CrMnTi under different laser shock parameters.

Main Results:

  • Optimal parameters for single-point LSP on 20CrMnTi were identified: 5 J shock energy, 20 ns pulse width, and 5 impacts.
  • Simulations demonstrated the mechanical response of 20CrMnTi to these parameters.
  • Multi-point LSP simulations using optimal parameters yielded residual compressive stress values comparable to single-point impacts.

Conclusions:

  • The validated FEM model accurately predicts residual stresses from LSP.
  • Optimal laser shock parameters were determined for enhancing 20CrMnTi properties.
  • LSP is effective in inducing significant residual compressive stresses, with multi-point impacts showing similar results to single-point impacts.