双轴向经编织物T700/BMI6421复合材料力学性能  

Mechanical properties of bi-axial warp-knitted fabric T700/BMI6421 composites

作　　者：李龙[1] 段跃新[1] 李超 肇研[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100191 [2]成都飞机工业有限责任公司复合材料加工中心,成都610092

出　　处：《复合材料学报》2011年第6期92-97,共6页Acta Materiae Compositae Sinica

摘　　要：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。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.

关 键 词：碳纤维经编织物 单向布 织物结构 弯曲性能 层间剪切性能 

分 类 号：TB332[一般工业技术—材料科学与工程]