| 2. 5维机织结构复合材料的几何模型 |
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| 引用本文： | 郑君,温卫东,崔海涛,高建辉.2. 5维机织结构复合材料的几何模型[J].复合材料学报,2008,25(2):143-148. |
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| 作者姓名： | 郑君 温卫东 崔海涛 高建辉 |
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| 作者单位： | 南京航空航天大学能源与动力学院,南京,210016 |
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| 摘 要： | 基于经纱矩形截面及纬纱双凸透镜截面假设 , 分析了 2. 5 维机织复合材料的细观几何结构 , 重点考虑了该结构表层经纱与内部经纱密度的不同及相同机织结构合成不同厚度和纤维束截面的情况 , 建立了 2. 5 维机织复合材料的单胞几何模型。该几何模型可以计算各种 2. 5 维机织结构单胞内各纱线系统的形态 , 包括取向角和纤维体积分数。通过对 8种结构 28 个试件纤维体积分数的测定 , 与计算预测结果的对比表明本文中建立的几何模型较好地反映了 2. 5维机织复合材料的内部结构。此外 , 利用本模型计算分析了 3 种不同结构的纤维体积分数和取向角。结果表明 : 单胞内经纬纱交织的次数是决定纤维体积含量的一个关键因素 ; 直联结构相比弯联结构 , 其经纱取向角明显降低。
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| 关 键 词： | 复合材料 2. 5维机织 几何模型 |
| 文章编号： | 1000-3851(2008)02-0143-06 |
| 收稿时间： | 2007-05-28 |
| 修稿时间： | 2007年5月28日 |
Geometric model of 2.5 dimensional woven structures |
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| ZHENG Jun,WEN Weidong,CUI Haitao,GAO Jianhui.Geometric model of 2.5 dimensional woven structures[J].Acta Materiae Compositae Sinica,2008,25(2):143-148. |
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| Authors: | ZHENG Jun WEN Weidong CUI Haitao GAO Jianhui |
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| Affiliation: | (College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China) |
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| Abstract: | Based on the hypothesis of the rectangle and biconvex section shape of the yarn , and different collocations
between the inner warp and outer warp , thickness , section shape of the same st ructure being considered especially ,a geomet ric cell model for 2. 5D woven st ructures is developed. This model can be used to calculate the configuration of each yarn system , including the orientation angle of the constituent yarns and the fiber volume f raction. To verify the geomet ric model , 28 samples of 2. 5D woven composites with 8 various st ructures are selected and the fiber volume f raction is measured. The experiment result s are in good agreement with the outcomes of the model . Further , the geomet rical model is used to calculate and analyze the fiber volume f raction and oriental angle of three various structures. A conclusion is drawn that the interweaving times of the fiber in a cell is the important factor for the fiber volume f raction , and the tropism angle of the straight2joint structure?s warp is lower than the bend2joint structure?s. |
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| Keywords: | composites 2 5D woven geomet ric model |
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