TY - CONF

T1 - Structural integrity of shrinkage and warpage optimized polypropylene produced by material extrusion-based additive manufacturing

AU - Petersmann, Sandra

AU - Spörk, Martin

AU - Wiener, Johannes

AU - Pinter, Gerald Gerhard

AU - Arbeiter, Florian

N1 - Accepted for Presentation at Society of Plastics Engineers' ANTEC®2020 (Paper not presented because of COVID-19).

PY - 2020

Y1 - 2020

N2 - Additively manufactured semi-crystalline polymers such as polypropylene (PP) are known to show significant shrinkage and warpage. By filling PP with expanded-perlite, these phenomena can be reduced drastically. However, besides the printing quality, the structural integrity of such compounds is essential. Therefore, fracture mechanical tests were performed on shrinkage-optimized, 3D-printed PP. As the material behaves in a highly non-linear fashion even at very high testing rates, linear elastic fracture mechanical approaches are not applicable. Therefore, the crack resistance of the material in dependence of its strand orientation, namely 0/0°, 0/90° and 90/90°, was evaluated by means of a J-integral (an elastic plastic method) with 0.44, 0.32 and 0.27 kJ/m2, respectively. Hence, the shrinkage and warpage properties of 3D-printed semi-crystalline PP are significantly enhanced by the addition of perlite filler, but in return a relative low resistance against crack growth independently of the strand orientation was found.

AB - Additively manufactured semi-crystalline polymers such as polypropylene (PP) are known to show significant shrinkage and warpage. By filling PP with expanded-perlite, these phenomena can be reduced drastically. However, besides the printing quality, the structural integrity of such compounds is essential. Therefore, fracture mechanical tests were performed on shrinkage-optimized, 3D-printed PP. As the material behaves in a highly non-linear fashion even at very high testing rates, linear elastic fracture mechanical approaches are not applicable. Therefore, the crack resistance of the material in dependence of its strand orientation, namely 0/0°, 0/90° and 90/90°, was evaluated by means of a J-integral (an elastic plastic method) with 0.44, 0.32 and 0.27 kJ/m2, respectively. Hence, the shrinkage and warpage properties of 3D-printed semi-crystalline PP are significantly enhanced by the addition of perlite filler, but in return a relative low resistance against crack growth independently of the strand orientation was found.

M3 - Abstract

T2 - ANTEC 2020

Y2 - 28 March 2020 through 2 April 2020

ER -