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Modeling of Laser Beam Absorption in a Polymer Powder Bed

  • 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.

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Metadaten
Author:Fuad Osmanlic, Katrin WudyORCiDGND, Tobias LaumerORCiDGND, Michael Schmidt, Dietmar DrummerGND, Carolin Körner
DOI:https://doi.org/10.3390/polym10070784
Parent Title (English):Polymers
Publisher:MDPI
Document Type:Article
Language:English
Year of first Publication:2018
Release Date:2022/06/07
Tag:PA12; additive manufacturing; laser absorption; polyamide 12; powder bed
Volume:10
Issue:7
Article Number:784
First Page:1
Last Page:11
Institutes:Fakultät Maschinenbau
Technologie-Campus Parsberg-Lupburg
Fakultät Maschinenbau / Labor Additive and Intelligent Manufacturing for Sustainability (AIMS)
Begutachtungsstatus:peer-reviewed
Publication:Externe Publikationen
OpenAccess Publikationsweg:Gold Open Access- Erstveröffentlichung in einem/als Open-Access-Medium
research focus:Produktion und Systeme
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International