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／BM16421复合材料作对比，分析了经编织物T700／BM16421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。%Comparing with the unidirectional（UD） cloth TT00/bismaleimide（BMI）6421 composite, mechanical properties of warp-knitted fabric T700/BMI6421 composite were studied. Bending properties and interlaminar shear properties of warp-knitted fabric T700/BMI6421 composite were tested. The variety in fabric structure caused by warp-knitted thread were demonstrated with metallographic microscope and SEM images. It is shown fiber distortions caused by warp-knitted thread decrease the bending performance. The bending modulus is 26% lower than the unidirectional cloth reinforced composite in the 45° direction. The interlaminar shear performance is improved by stitching structure which make the fiber layer tighter. The interlaminar shear strength（ILSS） is about 13% higher than the unidirectional cloth reinforced composite in the 0° direction. It is confirmed that traditional unidirectional cloth could be replaced by warp-knitted fabric in liquid composite molding process.
展开▼
