Adiabatic Shear Instability Based Mechanism for Particles/Substrate Bonding in the Cold Gas Dynamic Spray Process
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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Particlessubstrate interactions during the cold-gas dynamic-spray deposition process are studied using a dynamic axisymmetric thermo-mechanical finite element analysis. In addition, the particlessubstrate bonding mechanism has been investigated using a one-dimensional thermo-mechanical model for adiabatic strain softening and the accompanying adiabatic shear localization. The results obtained show that the minimal impact particles velocity needed to produce shear localization at the particlessubstrate interface correlates quite well with the critical velocity for particles deposition by the cold-gas dynamic-spray process in a number of metallic materials. This finding suggests that the onset of adiabatic shear instability in the particlessubstrate interfacial region plays an important role in promoting particlesubstrate adhesion and, thus, particlessubstrate bonding during the cold-gas dynamic-spray process.
- Coatings, Colorants and Finishes
- Fluid Mechanics
- Solid State Physics