Effect of Build Orientation and Print Speed on the Fracture Toughness of HP Multi Jet Fused Nylon 12

Authors: Shreejit Padmanabhan, Ruchi Gaur, Matthew Linzmeyer

Advisors: Dr. Ozgur Keles, Jennifer Gamboa

In present literature, the tensile and compressive mechanical properties of 3D printed polymers such as ABS and Nylon 12 are well studied, but there is a significant lack of fracture toughness information. Moreover, there is no fracture toughness data available for 3D-printed material produced using HP Multi Jet Fusion 3D printer. Fracture toughness indicates the amount of stress required to propagate a pre-existing crack. Therefore, in the medical device industry, toughness is an important material property since the occurrence of flaws is not completely avoidable in the processing, fabrication, or servicing of components. Hence, here we aim to characterize fracture toughness of HP Multi Jet Fused Nylon 12 quantitatively by altering print bed location, sample orientation, and print speed of 3D printed specimens. Through this project we aim to lay a foundation for future studies that will focus on using advanced 3D printers as an effective means for biomedical device manufacturing.