关键词: :喷丸强化, SPH耦合有限元, 弹丸流材料模型

Abstract:

In dealing with shot-peening simulation, FEM(finite element method)can not simulate a mass of shots impinging the target. To overcome the defect of FEM, the SPH (smoothed particle hydrodynamics) coupled FEM modeling for shot-peening was presented, in which the shots were modeled by SPH particles and the target material was modeled by FEM. The two parts interact through a contact algorithm. The material model for shot flow was established, and the relationships between compressive residual stress and peening frequencies, coverage, velocities were analyzed. Steady compressive residual stress can be obtained by repetitious peening, higher coverage can improve the distribution of compressive residual stress, higher velocities can induce higher and deeper residual stress in the target surface. The simulation results agree well with the experimental data.

Key words: shot-peening, SPH coupled FEM, material model for shot flow