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  4. Experimental, numerical and analytical investigation of the polyamide 12 powder bed fusion with the aim of building dimensionless characteristic numbers
 
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2021
Journal Article
Title

Experimental, numerical and analytical investigation of the polyamide 12 powder bed fusion with the aim of building dimensionless characteristic numbers

Abstract
In powder bed fusion (PBF), a laser based energy source selectively fuses polymer powder particles in a layer-by-layer process building up a three-dimensional structure. For powder bed fusion of polymers the knowledge about which material properties are important for the process and the product quality is insufficient. This causes significant difficulties in developing new materials. To address this problem, it is necessary to establish a clear link between the material properties, process parameters and the resulting component quality. This link can be achieved by performing a combination of experimental investigations, numerical simulations and analytical considerations to develop dimensionless characteristic numbers that are able to describe the process. Therefore, this paper presents material properties and monolayer printing experiments for polyamide 12. The experimental results are compared with numerical simulations based on the material and process data. Based on these results, we present a method of how to calculate the dimensionless energy input by combining the surface energy density with material properties and measured thickness of the monolayer samples. Furthermore, when considering the fusion time, numerical simulations show good correlation with an analytical model.
Author(s)
Grünewald, M.
SKZ - German Plastics Center,Würzburg
Popp, K.
SKZ - German Plastics Center,Würzburg
Rudloff, J.
SKZ - German Plastics Center,Würzburg
Lang, M.
SKZ - German Plastics Center,Würzburg
Sommereyns, A.
Friedrich-Alexander Universität Erlangen-Nürnberg
Schmidt, M.
Friedrich-Alexander Universität Erlangen-Nürnberg
Mohseni-Mofidi, S.
Fraunhofer-Institut für Werkstoffmechanik IWM  
Bierwisch, C.
Fraunhofer-Institut für Werkstoffmechanik IWM  
Journal
Materials and design  
Funder
Deutsche Forschungsgemeinschaft DFG  
Deutsche Forschungsgemeinschaft DFG  
Deutsche Forschungsgemeinschaft DFG  
Open Access
DOI
10.1016/j.matdes.2021.109470
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • simulation

  • melting

  • polyamide

  • additive manufacturing

  • powder bed fusion

  • dimensionless numbers

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