Surface derusting of rust-covered metallic surface via shot blasting: A smoothed particle hydrodynamics simulation

Abstract

In the shot blasting process, the micromechanical behaviors of the targeted structure induced by particle impact may cause considerable local deformation of the surface or even chip separation, making it difficult to quantitatively analyze via traditional methods. In this study, the smoothed particle hydrodynamics (SPH) method is used to simulate the impact process of hard particles on a metallic substrate covered by a rust layer, and the surface derusting mechanism owing to impact is investigated. First, a metallic target model with a rust layer impacted by particles of different shapes is established using the SPH method. The SPH discrete equation of the metal and rust layer materials is given, and elasto-plastic constitutive and failure models are formulated for the two materials. Next, the accuracy of the model in simulating impact-induced plastic craters and material removal is validated by a particle impact experiment. Further, the impact and erosion behaviors of particles with different shapes on the deformation and damage of the rust layer and metal are investigated under various initial orientations and impact angles. The results show that the model can effectively simulate the large local deformation and material removal of the rust layer caused by the impact of small particles.