Observation of Mode I Interlaminar Fracture Behavior of CFRP Laminated Material and FDM Type 3D Printer Molded CFRTP Laminated Material

Abstract

In recent years, CFRTP, which is being used in many industries, is attracting attention because it has the advantages of shorter molding time and easier processing than CFRP. In addition, 3D printers, which are being used in recent years, use a thermoplastic resin like CFRTP, so it is considered to be an appropriate molding method. Therefore, this study evaluates and compares the fracture toughness values of CFRTP molded by a 3D printer and CFRP of a different molding method. Then, the test speed is changed so that the behavior of unstable fracture of the test piece is not shown. It was possible to prevent unstable fracture by reducing the test speed of the CFRP test piece. CFRTP was found to fluctuate due to the effects of fiber cross-linking and fiber breakage, and a sharp increase and decrease in fracture toughness. However, the fracture toughness value was higher than that of CFRP, indicating that CFRTP has industrial utility.