铺层角度对苎麻纤维复合材料性能的影响

Effect of layup angle on ramie fiber reinforced composites

基于真空辅助成型工艺,研究铺层角度对苎麻织物增强环氧树脂复合材料力学性能的影响,并将该铺层设计应用在复合材料桥梁模型上。结果表明:当铺层方式为纬向铺层(90°)时,复合材料的拉伸强度最大,为73.5MPa;经纬交叉铺层(0°/90°)时,为72.4MPa。当铺层方式为经纬交叉铺层时,复合材料的拉伸模量、弯曲强度、弯曲模量和剪切强度皆为最大,分别为3.8GPa、108.2MPa、5.0GPa和21.7MPa。综合拉伸、弯曲、剪切性能,经纬交叉铺层复合材料力学性能最优。苎麻纤维复合材料桥梁的最大载荷为8.79kN,载荷质量比为12.08。

Based on the vacuum assisted molding process, the effects of different layup angles on the mechanical properties of ramie fabric reinforced epoxy resin composites are investigated. The different composite bridge models are designed by layup angle. The results show that the tensile strength of the composite is the best of 73.5 MPa when the layup direction is weft ( 90°), and the tensile strength of the composite is 72.4 MPa when the layup direction is cross-laying of warp and weft ( 0°/90°). The cross?composite has the largest tensile modulus, flexural strength, flexural modulus, and shear strength of 3.8 GPa, 108.2 MPa, 5.0 GPa, and 21.7 MPa, respectively with cross-laying warp and weft. Considering the tensile, bending and shear properties, the mechanical properties of composites with warp and weft cross-laying are optimal. The maximum load of ramie composite bridge is 8.79 kN, and the ratio of load to mass is 12.08.