Numerical Simulations of the High-Velocity Impact of a Single Polymer Particle During Cold-Spray Deposition
- PDF / 1,605,075 Bytes
- 15 Pages / 595.276 x 790.866 pts Page_size
- 104 Downloads / 198 Views
PEER REVIEWED
Numerical Simulations of the High-Velocity Impact of a Single Polymer Particle During Cold-Spray Deposition Sagar Shah1 • Jonghyun Lee1 • Jonathan P. Rothstein1
Submitted: 6 March 2017 / Published online: 24 April 2017 Ó ASM International 2017
Abstract In this paper, deposition of polymer powders was studied numerically for the cold-spray deposition technique. In cold spray, a solid particle is impacted on a substrate at high velocity. The deformation and heating upon impact have been shown to be enough to result in particle deposition and adhesion even without melting the particle. Here, a systematic analysis of a single high-density polyethylene particle impacting a semi-infinite highdensity polyethylene substrate was carried out for initial velocities ranging between 150 and 250 m/s using the finite element analysis software ABAQUS Explicit. A series of numerical simulations were performed to study the effect of a number of key parameters on the particle impact dynamics. These key parameters include particle impact velocity, particle temperature, particle diameter, composition of the polyethylene particle, surface composition and the thickness of a polyethylene film on a hard metal substrate. The effect of these parameter variations on the particle impact dynamics were quantified by tracking the particle temperature, deformation, plastic strain and rebound kinetic energy. The trends observed through variation of these parameters provided physical insight into the experimentally observed window of deposition where cold-sprayed particles are mostly likely to adhere to a substrate. Keywords ABAQUS Explicit finite element analysis high-density polyethylene high-velocity particle impact
& Jonghyun Lee [email protected] 1
University of Massachusetts, Amherst, MA 01003, USA
123
Introduction The high-speed impact of small particles on a substrate can yield a variety of results depending on the particle velocity, impact angle, the size and shape of the particle and the particle and substrate materials involved. The possible outcomes include peening or permanent indentation of the substrate, erosion from the substrate, substrate abrasion, adhesion of particle to the substrate or material loss due to damage (Ref 1, 2). Depending on the type of process and desired outcome, these effects can be considered detrimental or beneficial. Due to the recent advances and commercialization of a number of different additive manufacturing processes, a large number of experimental, numerical and theoretical studies have been conducted to understand the impact process. Of particular interest here is the process known as cold spray where metal particles are accelerated to very high speeds and impacted onto a metal substrate where they deform and adhere all the while remaining in the solid state. The cold-spray process has become popular in the aerospace and other industries as a mechanism for repair and reconditioning of metal parts (Ref 3). Although, with new advances, this technique is finding other usefu
Data Loading...
