Evaluation of Mode I Interlaminar Fracture Toughness of s-CF/PA6 Laminates Molded by FDM type 3D Printer

Abstract

This study evaluated the Mode I interlaminar delamination fracture toughness of s-CF/PA6 (short Carbon Fiber/Polyamide 6) laminates molded by FDM (Fused Deposition Molding) type 3D printer, using DCB (Double Cantilever Beam) tests on two different configurations. We also tested and compared dried and undried specimens. Fracture surface observations by scanning electron microscope revealed the mechanism of toughness development and factors affecting interlaminar delamination fracture toughness. The results showed that angle ply exhibit higher toughness than cross ply. The toughness of dried specimens was higher than that of the non-dried specimens. These results were highly variable. One reason for this is the difference in adhesion states and voids between layers. One possible cause of insufficient welding is a molding area temperature during molding. In addition, insufficient welding may occur if the filaments are printed when they are not sufficiently dry. As for voids, there is a possibility that they can be improved by adjusting the 3D printer.