Tailoring Flexural Properties With Continuous Ramie Fiber‐Reinforced Dual‐Matrix Composites via 3D Printing

ABSTRACT This study presents a novel strategy for the fabrication of 3D‐printed continuous ramie fiber‐reinforced dual‐matrix composites (CFRDCs), specifically designed to meet varying loading requirements. CFRDCs with different matrix compositions were systematically fabricated by integrating continuous fiber‐reinforced composite (CFRC) principles with optimized printing path planning. Three‐point bending tests were conducted to comprehensively evaluate their mechanical performance. The results demonstrated that the CFRDCs exhibited significantly enhanced energy absorption capabilities, exceeding those of pure polyethylene terephthalate glycol (PETG) and polylactic acid plus (PLA+) composites by 66% and 20%, respectively. Moreover, the use of varying matrix layer proportions effectively addressed the performance gaps commonly observed in conventional composite systems. Finally, the relationship between material composition and bending failure mechanism was elucidated through an in‐depth analysis of failure modes and damage characteristics.