Prediction of crack propagation along non-uniform raster patterns in AM composites
Chemical and Materials Engineering
Proceedings of the American Society for Composites - 35th Technical Conference, ASC 2020
Chopped fibers are commonly incorporated to composites manufactured by Fused Filament Fabrication to increase the mechanical properties in the primary raster direction. However, these composites are notoriously brittle in the transverse direction. In an attempt to improve the fracture toughness in the transverse direction, we propose to modify the raster path with a zig-zag architecture. Using both experiments and discrete damage modeling, we show that modified raster patterns successfully deflect cracks. The fracture mechanism transitions from interfilament delamination at low raster deflection angles, to transfilament fracture at larger raster deflection angles. Conceptually, this approach can be used to enhance fracture toughness, or steer cracks away from critical components embedded in FFF composites.
Brendan P. Croom, Mark Flores, Daniel Rapking, Ozgur Keles, and Julian Degery. "Prediction of crack propagation along non-uniform raster patterns in AM composites" Proceedings of the American Society for Composites - 35th Technical Conference, ASC 2020 (2020): 85-96. https://doi.org/10.12783/asc35/34844