热处理工艺对3D打印连续纤维增强复合材料层间性能的影响OA

3D-printed continuous carbon fiber reinforced composites(CCFRCs),with their exceptional proper-ties such as high strength,high modulus,and lightweight,have extensive application potential in the aerospace and aviation sectors.However,the weak interfacial bonding between fibers and resin,especially the inadequate inter-laminar performance,has become a critical factor limiting their further development.The effects of heat treatment on the interface properties and microstructure of 3D-printed CCFRCs were investigated.Through double cantilever beam(DCB)tests,the influences of process parameters such as ply angle,heat treatment temperature and heat treatment time on the interlaminar fracture toughness of CCFRCs were systematically investigated.Combined with scanning electron microscopy(SEM)analysis of fracture surface morphology,the mechanisms by which heat treat-ment affects the interlaminar performance of composites were revealed.The results show that the interlaminar fracture toughness of[0/45]3 and[0/90]3 specimens is higher than that of[0/0]3 specimens.After heat treatment,the fi-ber bundles of[0/90]3 specimens exhibit more matrix adhesion and rougher surfaces,leading to significantly im-proved interfacial bonding property.Among them,the interlaminar fracture toughness of[0/0]3 specimens treated at 60℃for 2 h reaches 1.570 kJ/m2,representing a 50.67％increase compared to untreated specimens.In addi-tion,longer heat treatment time results in more pronounced improvements in fracture toughness.Heat treatment en-hances the interfacial bonding performance of CCFRCs and modifies their interlaminar failure mode by increasing resin fluidity,filling voids between deposition lines,and optimizing fiber alignment.