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Vol. 49 No. 1 (2024)
Original articles

Effects of Aging and Refreshment Ratio on the Strength Properties of Selectively Laser Sintered Polyamide 12

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  • Igor Drstvenšek ,
  • Rembert Dhondt,
  • Snehashis Pal,
  • Tomaž Brajlih
Igor Drstvenšek
https://orcid.org/0000-0002-3723-2636 (unauthenticated) Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
Rembert Dhondt Jan De Nul nv, Tragel 60, 9308 Hofstade-Aalst, Belgium
Snehashis Pal Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
Tomaž Brajlih Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia

Published 2024-04-14

Keywords

  • polyamide 12,
  • aging,
  • refresh ratio,
  • density,
  • tensile strength,
  • selective laser sintering
    • ...More
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Abstract

This study investigated how the tensile properties of selectively laser-sintered polyamide 12 (PA12) specimens are affected by aging and refresh ratio. Starting with a new powder, printing cycles of approximately ten hours were performed, during which tensile and density specimens were printed. After each cycle, the powder was tested for melt flow index (MFI). In the first part, the best processing direction was determined. It was found that tensile strength, modulus of elasticity, elongation at break and MFI showed a linear trend, with the independent variable being the number of hours at elevated temperature. This was analyzed by linear regression. MFI increased with the number of hours at elevated aging, while all other properties mentioned decreased.

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