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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
Titel

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
Zeitschrift
Procedia CIRP
Funder
Deutsche Forschungsgemeinschaft DFG
Deutsche Forschungsgemeinschaft DFG
Konferenz
Conference on Photonic Technologies (LANE) 2020
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DOI
10.1016/j.procir.2020.09.015
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Language
English
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Fraunhofer-Institut für Werkstoffmechanik IWM
Tags
  • A12

  • grain scale

  • mesh free simulation

  • smoothed particle hyd...

  • dimensionless numbers...

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