Abstract
The techniques of cold gas dynamic spray (CGDS) coating involve the deposition of solid, high speed micron to nano particles onto a substrate. In contrast to a thermal spray, CGDS does not melt particles to retain their physico-chemical properties. There have been many advantages in developing microscopic analysis of deformation mechanisms with numerical simulation methods. Therefore, this study focuses on four cardinal numerical methods of analysis which are: Lagrangian, Smoothed Particles Hydrodynamics (SPH), Arbitrary Lagrangian-Eulerian (ALE), and Coupled Eulerian-Lagrangian (CEL) to examine the Cold Gas Dynamic Spray (CGDS) deposition system by simulating and analyzing the contact/impact problem at deformation zone using ductile materials. The details of these four numerical approaches are explained with some aspects of analysis procedure, model description, material model, boundary conditions, contact algorithm and mesh refinement. It can be observed that the material of the particle greatly influences the deposition and the deformation than the material of the substrate. Concerning the particle, a higher-density material such as Cu has a higher initial kinetic energy, which leads to a larger contact area, a longer contact time and, therefore, better bonding between the particle and the substrate. All the numerical methods studied, however, can be used to analyze the contact/impact problem at deformation zone during cold gas dynamic spray process.
Highlights
The cold gas dynamic spray (CGDS) mechanism is based on the solid-state deposition technique
The gradual shear and plastic deformation generated by impact velocity of the accelerated particle is accomplished by the expansion of pressurized gases through a nozzle the metallurgical coalescence is produced between the particle and the substrate [1,2]
This study presents four cardinal numerical methods of analysis which are: Lagrangian, Smoothed Particles Hydrodynamics (SPH), Arbitrary Lagrangian-Eulerian (ALE), and Coupled Eulerian-Lagrangian (CEL) to examine the Cold Gas Dynamic Spray (CGDS) deposition system by simulating and analyzing the contact/impact problem at deformation zone using ductile materials
Summary
The cold gas dynamic spray (CGDS) mechanism is based on the solid-state deposition technique. CGDS is suitable for various engineering applications, which include composites, ceramics, metals and polymers. Plastic deformation of particles occurs as it impacts on the target surface to form a uniform layer. When the velocity of the sprayed material reaches a predefined velocity called critical velocity under given operating conditions can the particles/substrate bonding occur [1,3]. Nanoscale cold spraying is a potential technology for depositing or coating nanostructured materials on the surface of the substrate without affecting its properties or structure significantly [3,4,5,38]. The technology finds enormous applications including metal matrix composite (MMC), metallic, ceramic, and plastic
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
