【摘要】 以玻纤双轴向经编复合材料为研究对象，探讨经编捆绑纱对其力学性能的影响。由于捆绑纱是连接经纬增强纱的关键单元，对复合材料性能存在重要影响。通过制备含低弹涤纶捆绑纱的双轴向经编复合材料及去除捆绑纱的类双轴向复合材料，采用真空导流成形工艺制作试样，测试其拉伸、压缩、三点弯曲及低速冲击性能，并结合微观形貌分析作用机制。结果表明：含捆绑纱的复合材料拉伸强度提高21.67%，压缩强度提高17.50%，弯曲强度和模量分别提升10.01%和6.54%，低速冲击能量吸收率提高9.92%。捆绑纱通过增强层间结合、协调纱线受力、抑制纤维屈曲与分层扩展等作用，优化了复合材料的载荷分配与能量耗散能力，显著改善其综合力学性能。更多还原

【Abstract】 Taking glass fiber warp-knitted biaxial composite materials as the research object, this study investigates the influence of warp-knitted binding yarns on their mechanical properties. Since binding yarns serve as the key unit connecting warp and weft reinforcement yarns, it significantly influences composite material performance. Therefore, we prepare warp-knitted biaxial composite materials containing lowelasticity polyester binding yarns and similar biaxial composite materials without binding yarns. Samples are fabricated using a vacuum infusion molding process, the tensile, compressive, three-point bending, and lowspeed impact properties are tested, and the mechanisms are analyzed through microscopic morphology analysis. The results show that the tensile strength of the composite materials with binding yarns increases by 21.67%, the compressive strength increases by 17.50%, the bending strength and modulus increase by 10.01% and 6.54%, respectively, and the low-speed impact energy absorption rate increases by 9.92%. The binding yarns enhance interlaminar bonding, coordinates yarn stress distribution, and suppresses fiber buckling and delamination propagation, thereby optimizing the composite materials’ load distribution and energy dissipation capabilities, significantly improving its overall mechanical properties.更多还原