Multiscale Coupling Analysis of Energy Absorption in 3D Printed Continuous Fiber Reinforced Thermoplastic Orthogonal Fabric Composites

Generally, serious delamination and defect propagation are the primary damage modes observed in 3D printed continuous fiber reinforced thermoplastic composites (3D printed CFTP composites) under low-velocity impact. The study of fabric structure design and its impact resistance is crucial for the practical application of 3D printed composites, yet the existing research in this area is limited. In this paper, the preparation scheme of 3D printed continuous fiber reinforced thermoplastic orthogonal fabric composites (3D printed CFTPOF composites) with the improved impact resistance is proposed initially. Then, the analysis models for the molding process and mechanical properties of the 3D printed CFTPOF composites are established. To address the limitations of current analysis methods for 3D printed composites, a coupled multiscale method (3DP-MS method), is proposed for predicting mechanical properties. The transfer of mechanical parameters between multiscale models is also established and validated through experiments. Finally, the impact performance and the energy absorption of 3D printed CFTPOF composites under different fabric paths and yarn distributions are analyzed and discussed. This paper provides theoretical basis and simulation method for the structural design of impact-resistant 3D printed CFTP composites.