Stochastic Fracture of Additively Manufactured Composites

Authors: Dr. Ozgur Keles, Eric Anderson

Advisor: Dr. Ozgur Keles

Additive manufacturing (AM) is increasingly used to produce parts from composites, polymers, metals, and ceramics. Among various AM techniques, fused filament fabrication (FFF) can use relatively cheap short-fiber-reinforced composites and polymers, making FFF accessible for industrial and consumer-level production. Despite the increasing use of FFF to produce parts from composites, mechanical behavior of fused filament fabricated (FFFed) porous short-carbon-fiber-reinforced acrylonitrile butadiene styrene and the variations in their mechanical properties are unclear. It is critical to understand the reliability of FFFed materials for the production of biomedical products such as prosthetic legs, arms, or hands, and casts for bone fracture. In this study, we investigated the effects of porosity and raster orientation on the stochastic fracture of FFFed composites. We also used X-ray computed tomography to investigate as-received and extruded filaments. Finally, we performed micromechanical simulations to understand the effects of porosity and size on the stochastic fracture.