Modeling of the Compaction Shot-Peening Process of an Al Multiparticulate Coating

A 2D MultiParticle Finite Element Model (MPFEM) was used to analyze the compaction by shot-peening of a multiparticulate coating. A representative microstructure was created from SEM cross-section observations of the coating and implemented into a finite element code. A first single shot study enabled the study of the influence of the process parameters (shot velocity, diameter, angle). The results were then used to simulate a multi-shot model, where the influence of the coverage was studied with the analysis of the change in morphology of the particles, the intraparticle plastic strain and the residual stresses in the coating. Simulations showed that: the velocity of the shot is the most influential parameter; the equivalent plastic strain has its maximum at the surface of the coating and increases with the coverage as well as the maximum compression. The compaction mechanisms are mainly the closing of interstitial pores and the elongation of the particles by plastic strain.