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对双轴向经编织物T700/双马来酰亚胺树脂(BMI)6421复合材料进行了弯曲性能和层间剪切性能测试,以同状态无经编线的单向布T700/BMI6421复合材料作对比,分析了经编织物T700/BMI6421复合材料的力学特性,采用微观金相、SEM分析了经编线引起的纤维层内部结构变化。结果表明,引入经编线导致纤维束面内排列产生扰动,降低了复合材料的弯曲性能,45°方向上弯曲模量下降约26%;经编线的绑缚使纤维层结合更加紧密,提高了层间剪切性能,0°方向上层间剪切强度提高约13%。证实了复合材料液体成型工艺中,经编织物可替代单向布等传统预成型体。
The biaxial tricot fabric T700 / bismaleimide resin (BMI) 6421 composites were tested for flexural properties and interlaminar shear properties. The unbonded unidirectional woven T700 / BMI6421 composites For comparison, the mechanical properties of T700 / BMI6421 composite were analyzed. The microstructure and the changes of the internal structure of the fiber layer were analyzed by SEM. The results show that the introduction of warp threads leads to the disturbance in the in-plane arrangement of the fiber bundles, which reduces the bending properties of the composites. The flexural modulus decreases by about 26% in the direction of 45 °. The binding of warp knitting yarns makes the fiber layers bond more tightly The interlaminar shear properties increase the interlaminar shear strength by about 13% in the 0 ° direction. Confirmed the composite liquid forming process, warp knit fabric can replace the unidirectional cloth and other traditional preform.