8th International Conference on Materials Science and Nanotechnology For Next Generation, Elazığ, Turkey, 14 - 16 July 2021, pp.134
The shot peening process has been widely utilized as a surface treatment to improve the fatigue strength of the parts used in the automotive, aerospace, and aircraft industries. Residual compressive stress is formed on the surface of the target metal after the process that enhances the fatigue life of the part and reduces maintenance costs. Although there have been numerous experimental studies on the shot peening process, computational analyses are limited. Within this study, the shot peening process is simulated by the finite element method (FEM) and smoothed-particles hydrodynamics (SPH). The Johnson-Cook hardening model is used to define the high strain-rate behavior of the 7075-T6 Al alloy, and the Hugoniot equation of state formulation is used to describe steel shots. Verification of the FEM is conducted through comparison analyses results with an experimental study in the literature. The effect of average particle size and shot velocity on the residual stress distribution of the treated alloy is analyzed. The results put forth that the compressive residual stress formed on the base metal shows an increase at the higher shot velocities. Also, larger particles deepen the plastic deformation region and thus, yield higher values of compressive residual stress. The research outcomes would be beneficial for a better understanding of the influence of shot peening parameters on the fatigue life assessment of the shot-peened parts.