Experimental evaluation of the influence of structural parameterson tensile properties of 3D woven composites
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摘要: 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。Abstract: The tensile properties in warp and weft directions of four different st ructural kinds of carbon/ resin 3Dwoven composites are evaluated based on a series of experiment comparison and analysis. The result s indicate thatthe load-displacement curves of the four kinds of 3D woven composites in both directions show double linearity , andthe initial module is higher than the second module ; there is no yield point st rength at load-displacement curves of allkinds of 3D woven composites , which shows that the composites are brittle material ; 3D woven composites providegood mechanical behavior , and achieve higher tensile properties in both directions for one st ructural kind of composites ; the function of warp-stuffer is increasing the tensile st rength and module in the warp direction greatly , and thepurpose of increasing wef t density is increasing the tensile st rength and module in the wef t direction ; the compositeswith warp-stuffer and wef t-stuffer possesses the best mechanical properties among the four different st ructural kindsof 3D woven composites.
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