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Polymers 2018, 10(7), 784; https://doi.org/10.3390/polym10070784

Modeling of Laser Beam Absorption in a Polymer Powder Bed

1,2,†,* , 2,3,†
,
2,4,†
,
2,4
,
2,3
and
1,2,5
1
Joint Institute of Advanced Materials and Processes, Friedrich-Alexander-Universität Erlangen-Nürnberg Dr.-Mack-Str. 81, 90762 Fuerth, Germany
2
Collaborative Research Center 814-Additive Manufacturing, Friedrich-Alexander-Universität Erlangen-Nürnberg, Am Weichselgarten 9, 91058 Erlangen, Germany
3
Institute of Polymer Technology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Am Weichselgarten 9, 91058 Erlangen, Germany
4
BLZ Bayerisches Laserzentrum GmbH, 91052 Erlangen, Germany
5
Chair of Materials Science and Engineering for Metals, Friedrich-Alexander-Universität Erlangen-Nürnberg, Martensstr. 5, 91058 Erlangen, Germany
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Received: 21 May 2018 / Revised: 28 June 2018 / Accepted: 16 July 2018 / Published: 17 July 2018
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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. View Full-Text
Keywords: additive manufacturing; laser absorption; powder bed; polyamide 12; PA12 additive manufacturing; laser absorption; powder bed; polyamide 12; PA12
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Osmanlic, F.; Wudy, K.; Laumer, T.; Schmidt, M.; Drummer, D.; Körner, C. Modeling of Laser Beam Absorption in a Polymer Powder Bed. Polymers 2018, 10, 784.

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