缠绕张力对T800级碳纤维力学性能转化率的影响

Effect of winding tension on conversion rate for mechanical property of T800 grade carbon fiber

  • 摘要: 为探究碳纤维在缠绕工艺中纤维性能转化率的影响因素,对3种T800级碳纤维进行了NOL环性能测试,研究了缠绕张力对环氧树脂基复合材料力学性能及纤维性能转化率的影响,进一步测试了缠绕损伤纤维的力学性能及微结构参数。结果表明:缠绕张力变化引起了NOL环纤维含量、孔隙率、拉伸性能及破坏模式的变化;采用X射线衍射、拉曼光谱、小角X射线散射表征了纤维的结晶结构、石墨结构完整程度及微观缺陷,发现缠绕损伤纤维微晶结构参数未发生明显变化,故纤维拉伸模量下降较少;张力增大,损伤纤维孔洞缺陷增多,导致纤维和复合材料拉伸强度下降;进口纤维较国产纤维有更高的性能转化率,在相同张力水平下纤维损伤较小。

     

    Abstract: In order to explore the influencing factors of conversion rate for mechanical property of carbon fiber using winding process, NOL ring properties with three kinds of T800 grade carbon fibers were tested. The effects of winding tension on the mechanical properties of epoxy resin matrix composites and conversion rate of fiber were studied. Moreover, mechanical property and microstructure parameters of damaged fibers after winding process were measured. The results show that winding tension changes fiber content, porosity, tensile property and failure mode of NOL ring. Crystalline structure, completeness of graphite structure and micro-defect of carbon fiber were characterized by means of X-ray diffraction, Raman spectrum and small angle X-ray scattering. The results demonstrate that the microcrystalline structure parameters of the damaged fibers don't change significantly, so the tensile modulus of the damaged fibers decreases negligibly. Pore defect of the damaged fibers increases with increasing tension, resulting in the decreases of tensile strength for fiber and the composite. The conversion rate of imported fiber is higher than those of domestic fibers, and the damage of fiber is weaker under the same tension level.

     

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