| Abstract Scope |
In many metal cold spray depositions, a key factor in determining bond strength and final coating quality is the oxide-free metal-to-metal contact between the powder and the substrate. In this study, a peridynamics (PD) based numerical approach was developed and employed to model the deformation behaviors of oxide-coated metal particles during cold-spray deposition. The disruption, fracture, and subsequent removal of oxide films during impact were studied. The amount and morphology of the residual oxide, and locations of intimate metal contact were found to be consistent with the experimental observations. The effects of oxide thickness and fracture toughness on particle deformation/bonding were investigated, and the coefficients of restitution for different particle impact velocities with varying adhesion energies between the particles and the substrate were also calculated. This simulation method provides a more realistic numerical framework for the more accurate study of cold spray impact in the presence of oxide films. |