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  4. Particle-based simulation, dimensional analysis and experimental validation of laser absorption and thermo-viscous flow during sintering of polymers
 
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2020
Journal Article
Title

Particle-based simulation, dimensional analysis and experimental validation of laser absorption and thermo-viscous flow during sintering of polymers

Abstract
Smoothed Particle Hydrodynamics simulations are used to study the thermo-viscous flow on the powder particle length scale. The effects of laser absorption, latent heat, thermal diffusion, melting and re-solidification, viscous diffusion, surface tension, Marangoni currents and gravity are considered in the model. Influences of varied laser scanning parameters are analyzed. The strongly different time scales of laser absorption, heat conduction and viscous flow as well as the transient behavior of temperature and strain rate observed in the simulations are predicted with good accuracy by a dimensional analysis. The simulation results for the transient surface temperature are validated by infrared camera measurements.
Author(s)
Bierwisch, C.
Fraunhofer-Institut für Werkstoffmechanik IWM  
Mohseni-Mofidi, S.
Fraunhofer-Institut für Werkstoffmechanik IWM  
Dietemann, B.
Fraunhofer-Institut für Werkstoffmechanik IWM  
Kraft, T.
Fraunhofer-Institut für Werkstoffmechanik IWM  
Rudloff, J.
SKZ German Plastics Center
Lang, M.
SKZ German Plastics Center
Journal
Procedia CIRP  
Funder
Deutsche Forschungsgemeinschaft DFG  
Deutsche Forschungsgemeinschaft DFG  
Conference
Conference on Photonic Technologies (LANE) 2020  
Open Access
DOI
10.1016/j.procir.2020.09.015
Additional full text version
Landing Page
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • A12

  • grain scale

  • mesh free simulation

  • smoothed particle hydrodynamics

  • dimensionless numbers

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