喷丸工艺对18Cr2Ni4WA钢残余应力影响的有限元模拟

Finite Element Simulation of Shot Peening Effect on Residual Stress in 18Cr2Ni4WA Steel

摘要: 采用ANSYS/LS-DYNA有限元软件模拟了在不同弹丸速度和半径下喷丸强化后18Cr2Ni4WA钢的表层残余应力分布，并进行了试验验证。结果表明：18Cr2Ni4WA钢表层中最大残余压应力随着弹丸速度或弹丸半径的增加均先增大后减小,当弹丸速度为120 m·s-1、弹丸半径为0.6 mm时喷丸强化效果较佳；喷丸后钢表层残余应力分布的模拟结果和试验结果相吻合，证明了模型的准确性。

Abstract: The residual stress distribution in the surface layer of 18Cr2Ni4WA steel at different shot speeds and shot radii was simulated with ANSYS/LS-DYNA finite element software, and the simulation results was verified by experiment. The results show that the maximum residual stress in the surface layer of 18Cr2Ni4WA steel first increased then decreased with the increase of shot speed or shot radius. The strengthening effect of the shot peening was relatively good at shot speed of 120 m·s-1 and shot radius of 0.6 mm. The simulated results of residual stress distribution in surface layer of the steel agreed well with experimental results, proving the accuracy of the model.