The process and effect of coating removal by particle impingement in mixed jet were simulated which could provide guidance for selecting appropriate process parameters.Taking the paint layer on the surface of automobile plastic parts as the research object,the finite element model was established by using element deletion technique and inserting Cohesive layer element method in ABAQUS software.In the simulation process,the particle size,cohesive energy of Cohesive layer and impact velocity were controlled,and the removal rate of paint layer,the depth of impact and the impact kinetic energy were compared.The results showed that when the 2 mm particle size particles impact the paint layer model at a speed of 40 m/s,the positions on both sides of the Cohesive layer below the impact point were first damaged.The vertical stress depth reached inside the matrix and left a damage area of the outer paint layer and interface delamination.After combining different particle size and velocity parameters,it was found that when the particle size was 0.8～1,1.4～1.6 and 2 mm,and the speed was higher than 55,40 and 30 m/s respectively,the impact depth could exceed 0.15 mm paint thickness,reach the substrate surface.After counting the number and volume of damaged units,it was found that the paint removal rate of particles with particle sizes of 1.4,1.6 and 2 mm respectively exceeds 4％after the speed reaches 55,45 and 40 m/s.The larger the particle size and speed combination,the more obvious the paint removal effect.Appropriate incident velocity and particle size should be selected in the actual processing to prevent excessive incident velocity resulting in increased costs and matrix damage.
维普
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