Abstract
The impact between particles and material surface is a micro-scaled physical phenomenon found in various technological processes and in the study of the mechanical properties of materials. Design of materials with desired properties is a challenging issue for most industries. And especially in aviation one of the most important factors is mass. Recently with the innovations in 3D printing technologies, the importance of this phenomenon has increased. Numerical simulation of multi-particle systems is based on considering binary interactions; therefore, a simplified but as much accurate as possible particle interaction model is required for simulations. Particular cases of axisymmetric particle to substrate contact is modelled at select impact velocities and using different layer thicknesses. When modelling the particle impact at high contact velocity, a substrate thickness dependent change in the restitution coefficient was observed. This change happens is due to elastic waves and is important both to coating and 3D printing technologies when building layers of different properties materials.
Highlights
Integrating energy across volume of substrate where elastic waves are expected to be at given time moment, we get energy distribution: around 10% of energy lost by particle is contained by compression wave, while other 90% is contained by slower shear and surface waves
Coefficient of restitution used to illustrate Zener model is related to inelasticity coefficient through (Boettcher et al, 2017b) approximation eCOR =exp(−1,7174λ)
The study of energy dissipation leads to the following conclusions: Substrate thickness influences the value of coefficient of restitution due to elastic wave propagation
Summary
The earlier research of dissipation related to wave propagation was limited to low-velocity impact of millimeter sized particles This effect is negligibly small for interacting particles. The main focus of this article is investigation of loss of energy during particle-substrate interaction For this purpose, Hertz normal contact model was considered as a base-line and only perfectly elastic axisymmetric particle to substrate contact is modelled at select impact velocities and using different layer thicknesses. When modelling the particle impact at high contact velocity, a substrate thickness dependent change in the restitution coefficient was observed. This change happens due to elastic waves and is important both to coating and 3D printing technologies when building layers of different properties materials
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