三维四向编织复合材料纤维体积含量的预测与参数分析  

On Improving Mechanical Properties of 3-D Braided Composite Material(BCM)

作　　者：马忠辉[1] 孙秦[1] 

机构地区：[1]西北工业大学航空学院,陕西西安710072

出　　处：《西北工业大学学报》2003年第6期662-666,共5页Journal of Northwestern Polytechnical University

摘　　要：纤维体积含量是决定编织复合材料各种性能的重要参数指标 ,纤维含量的高低将直接影响到各种材料性能。通过细致研究三维四向 1 x1编织体编织工艺过程 ,提出了更为精确的纤维体积含量预测方法。应用这一方法对实际编织体预测 ,其结果与实验结果吻合得很好。在此基础上 ,分析了纤维束直径、纤维束弯曲半径、携纱器单步运动形成编织体高度等主要细观结构参数 ,对代表单元编织体纤维体积含量的影响敏感度及关系曲线 ,为编织复合材料性能及纤维含量的细观优化设计奠定了分析基础。Three dimensional (3 D) BCM possesses great potential in engineering applications. We propose improving its mechanical properties through proper design of its meso structural parameters. After much painstaking research, we have come to discover that raising yarn volume percentage in representative volume element (RVE) is the key to proper design of meso structural parameters. Section 1 develops in some detail the model for RVE (Figs.1, 2, and 3) and then derives eqs.(1), (2), and (3) for predicting yarn volume percentage. Meso structural parameters are d (yarn diameter), R (one kind of bending radius), R′ (another kind of bending radius), h (1/4 moving height of yarn carrier), λ (yarn arc length ratio), and l j , which appear in Figs. 1, 2, and 3 and also in eqs. (1), (2), and (3). Table 1 lists five yarn volume percentages computed with eqs. (1), (2), and (3) and compares them with those experimentally determined. Calculated and experimental yarn volume percentages agree quite well with each other. Section 3 discusses the constraining relationship that exists among some meso structural parameters and then discusses the influence of meso structural parameters on yarn volume percentage. Subsection 3.1 discusses the constraining relationship that exists among h , l min , and l j min . Figs. 7 and 8 show respectively the effects of R and h on yarn volume percentage. Fig.9 shows the effect of h on maximal yarn volume percentage. Eqs.(1), (2), and (3) and Figs. 7, 8, and 9 can be helpful to the designer to raise yarn volume percentage as much as possible and thus improve the mechanical properties of 3 D BCM.

关 键 词：三维四向编织 复合材料 细观结构参数 代表单元 

分 类 号：TB332[一般工业技术—材料科学与工程]