Modeling of laser beam absorption in a polymer powder bed

Fuad Osmanlic, Katrin Wudy, Tobias Laumer, Michael Schmidt, Dietmar Drummer, Carolin Körner

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

In order to understand the absorption characteristic, a ray trace model is developed by taking into account the reflection, absorption and refraction. The ray paths are resolved on a sub-powder grid. For validation, the simulation results are compared to analytic solutions of the irradiation of the laser beam onto a plain surface. In addition, the absorptance, reflectance and transmittance of PA12 powder layers measured by an integration sphere setup are compared with the numerical results of our model. It is shown that the effective penetration depth can be lower than the penetration depth in bulk material for polymer powders and, therefore, can increase the energy density at the powder bed surface. The implications for modeling of the selective laser sintering (SLS) process and the processability of fine powder distributions and high powder bed densities are discussed.

Original languageEnglish
Article number784
JournalPolymers
Volume10
Issue number7
DOIs
StatePublished - 17 Jul 2018
Externally publishedYes

Keywords

  • Additive manufacturing
  • Laser absorption
  • PA12
  • Polyamide 12
  • Powder bed

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