Residual Stress Field of High-Strength Steel After Shot Peening by Numerical Simulation

The high-strength steel (40CrMnsiMoVA) used in aviation industry was taken in this work. The residual stress field of the steel after shot peening was determined by x-ray stress instrument. Meanwhile, the finite element model of the shot peening was established, and the residual stress field of the steel after shot peening was numerically simulated by ANSYS software. Then, the simulated result was compared with the measured one to verify the validity of the model. Based on this model, the residual stress fields of the steel with different shot velocities and shot diameters were simulated. The results show that, with the increase in the shot velocity, maximum residual stress (sigma (mrs)), maximum residual stress depth (xi (0)) and strengthen depth (xi (m)) are increased gradually. When the shot velocity is 280 m/s, the sigma (mrs) reaches -696 MPa, and the xi (0) and xi (m) increase to 0.43 and 0.70 mm, respectively. With the increase in the shot diameter, the sigma (mrs), xi (0) and xi (m) are increased gradually. When the shot diameter is 1.5 mm, the sigma (mrs), xi (0) and xi (m) increase to -800 MPa, 0.56 and 0.78 mm, respectively.