Simulation of the Cold Spray Particle Deposition Process

摘要: Cold spray is a rapidly developing coating technology for depositing materials in the solid state. The cold particle deposition process was simulated by modeling high velocity impacts of spherical particles onto flat substrate under various conditions. We, first time, proposed Couple Eulerian Lagrangian (CEL) numerical approach to solve strain rate deformation problem. capability CEL Spray verified through systematic parameter study, including impact velocity, initial temperature, friction coefficient and combination. simulation results using agree with experimental published literature. Comparing other approaches, which are Lagrangian, ALE SPH, analyses generally more accurate robust higher regimes. Besides simulating single problem, we also extended our study into multiple impacts. A FCC-like arrangement model that inspired crystal structure built investigate porosity residual stress deposited We observed not only 3D profiles voids, but their distributions developments during different procedures. Higher temperature both benefit produce denser coating. compressive stresses existed interface between mainly caused large fast plastic deformation. Another simplified created surface erosion. severe erosion result low contact angle. Two element failure models suitable high-strain-rate dynamic problems were introduced this study. For ductile material as Copper, it followed two fracture modes tensile mode shear mode. former one occurred beneath periphery craters, nevertheless latter found predominately at craters. Four steps propagation crack: void formation; crack growth; coalescence failure. simple criterion equation derived based on predicting initiation damage, v_{ero} function angle normal v_{pi/2}. equivalent could be identifying onset identified being 1.042 Copper