结构参数对碳/树脂3D机织复合材料拉伸性能的影响

Experimental evaluation of the influence of structural parameters on tensile properties of 3D woven composites

通过一系列的实验比较和分析研究,客观评价了4种不同结构碳/树脂3D机织复合材料沿经向和纬向的拉伸性能。实验结果表明,4种3D机织复合材料沿经向和纬向的负荷-位移曲线具有双线性,初始模量高于二次模量;3D机织复合材料的拉伸曲线无屈服点,是脆性材料;3D机织复合材料的力学性能优良,可同时在经向和纬向获得很高的拉伸性能;加入衬经纱可以大大提高经向的拉伸强度和模量,加大纬纱密度可以大大提高纬向的拉伸强度和模量;4种不同结构3D机织复合材料中以带衬经和衬纬的复合材料拉伸性能为最佳。

The tensile properties in warp and weft directions of four different structural kinds of carbon/resin 3D woven composites are evaluated based on a series of experiment comparison and analysis. The results indicate that the load-displacement curves of the four kinds of 3D woven composites in both directions show double linearity, and the initial module is higher than the second module; there is no yield point strength at load-displacement curves of all kinds of 3D woven composites, which shows that the composites are brittle material; 3D woven composites provide good mechanical behavior, and achieve higher tensile properties in both directions for one structural kind of composites; the function of warp-stuffer is increasing the tensile strength and module in the warp direction greatly, and the purpose of increasing weft density is increasing the tensile strength and module in the weft direction; the composites with warp-stuffer and weft-stuffer possesses the best mechanical properties among the four different structural kinds of 3D woven composites.