FEM analysis of energy loss due to wave propagation for micro-particle impacting substrate with high velocities
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.
Article in English.
Mikrodalelės, smogiančios į pagrindą dideliu greičiu, energijos nuostolio dėl bangų sklidimo BEM analizė
Santrauka
Smūgis tarp dalelių ir medžiagos paviršiaus yra mikromasto fizikinis reiškinys, aptinkamas įvairiuose technologiniuose procesuose ir tiriant medžiagų mechanines savybes. Norimų savybių medžiagų projektavimas yra sudėtingas uždavinys daugelyje pramonės šakų. Aviacijoje ypač svarbus faktorius yra masė. Pastaruoju metu tobulėjant 3D spausdinimo technologijoms šio reiškinio svarba išauga. Daugiadalelinių sistemų skaitinis modeliavimas pagrįstas dalelių porų sąveikų vertinimu, todėl simuliacijoms reikalingas supaprastintas, bet kuo tikslesnis dalelių sąveikos modelis.
Šiame darbe nagrinėjami keli dalelių ir pagrindo kontakto atvejai tarp skirtingu greičiu judančios dalelės ir skirtingo storio pagrindo. Modeliuojant dalelės ir pagrindo sąveiką, esant dideliam kontakto greičiui, buvo pastebėtas nuo pagrindo storio priklausomas restitucijos koeficiento pokytis. Šis pokytis atsiranda dėl tampriųjų bangų ir yra svarbus tiek medžiagos padengimo, tiek 3D spausdinimo technologijoms kaupiantis skirtingų savybių medžiagų sluoksniams.
Reikšminiai žodžiai: dalelės ir sienos sąveika, pagrindo storis, visiškai tamprus smūgis, didelio greičio kontaktas, normalinis kontaktas, tampriosios bangos, restitucijos koeficientas.
Keyword : particle-wall interaction, substrate thickness, perfectly elastic collision, high velocity contact, normal contact, elastic waves, coefficient of restitution
This work is licensed under a Creative Commons Attribution 4.0 International License.
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