Numerical optimization of surface residual stresses induced by laser peening using Taguchi method

摘要

The objective of this study was to assess parametric impact during laser peening (LP) of 6061-T6 aluminum alloy and optimize the process parameters to achieve higher surface compressive residual stresses. The effect of laser power, number of LP impact, laser shot diameter and LP patterns was studied and optimized using Taguchi method. Nine experiments were required to study the effect of parameters on surface compressive residual stresses. In order to reduce the experimental cost and time, the finite element method was applied to simulate the LP process. The LP simulations were carried out by FEM commercial code ABAQUS. Each simulation experiment was calculated mean and signaloise (S/N). The obtained results were analyzed using the statistical software MINITAB. The results showed that number of LP impact was the most effective parameter in comparison with others. Based on the S/N ratio, the optimized conditions for surface compressive residual stresses were laser power 40J, number of LP impact 3, laser shot diameter 10mm, LP pattern the 2ed. The experimental results confirm the adequacy and effectiveness of this approach.