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AMB2018-04: Benchmark Physical Property Measurements for Powder Bed Fusion Additive Manufacturing of Polyamide 12.

Erich D Bain1, Edward J Garboczi2, Jonathan E Seppala3

  • 1Materials and Manufacturing Sciences Division, U.S. Army Research Laboratory, Aberdeen Proving Ground, Aberdeen, MD 21005, USA.

Integrating Materials and Manufacturing Innovation
|March 18, 2024
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Summary
This summary is machine-generated.

Laser sintering (LS) of polyamide 12 (PA12) parts requires comprehensive datasets. This study provides crucial process-structure-property data for LS PA12, enhancing part quality and reducing costs.

Keywords:
Additive manufacturingLaser sinteringPolyamide 12Polymer crystallinityPorosity

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Area of Science:

  • Materials Science
  • Additive Manufacturing
  • Polymer Processing

Background:

  • Laser sintering (LS) of polyamide 12 (PA12) is vital for industrial part production.
  • Lack of organized datasets increases risks of poor part quality and high costs.
  • Existing literature is fragmented across different machines, materials, and parameters.

Purpose of the Study:

  • To generate a comprehensive, publicly available dataset for LS PA12.
  • To investigate the relationship between LS processing, material structure, and physical properties.
  • To compare LS PA12 with conventionally melt-processed material.

Main Methods:

  • Processing of a single LS PA12 feedstock along four build dimensions.
  • Characterization using a wide range of physical techniques.
  • Comparison with melt-processed PA12.

Main Results:

  • Detailed analysis of particle size and shape distributions.
  • Identification of semicrystalline phase changes localized by LS processing.
  • Evaluation of chemical aging effects on melt viscosity.
  • Characterization of porosity orientation relative to build axes.
  • Assessment of microstructural effects on tensile properties and failure mechanisms.

Conclusions:

  • The study provides novel insights into LS PA12 behavior.
  • Publicly available datasets will aid modelers and practitioners.
  • Improved certifiability and repeatability of LS-manufactured parts are expected.