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Finite element analysis of 3D braided composites based on three unit-cells models

机译：基于三个单元模型的3D编织复合材料的有限元分析

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摘要

3D braided composites have a skin-core structure and can be divided into three regions: interior, surface and corner. Each region is built up of identical unit-cells but the yarn configuration in the three regions is different thus must be treated separately. In this paper, three distinct solid structure models of unit-cell located in the interior, surface and corner regions of 3D braided composites are established first. With appropriate boundary conditions, the mechanical responses of 3D braided composites are simulated by using the finite element method. The deformation and stress distribution of the three unit-cell models are presented and the effects of the braiding angle and fiber volume fraction on the elastic constants of 3D braided composites are investigated in detail. Numerical results show that the three unit-cells have distinctive properties and the surface and corner unit cells are stiffer than the interior unit cell. Therefore, the effect of surface and corner regions on the mechanical properties of 3D braided composites must be considered in order to obtain accurate results. The calculated results show good agreement with available experiment data, thus verifies the applicability of the proposed three unit-cells models.
机译：3D编织复合材料具有皮芯结构，可以分为三个区域：内部，表面和角落。每个区域由相同的单元构成，但是三个区域中的纱线配置不同，因此必须分开处理。在本文中，首先建立了位于3D编织复合材料的内部，表面和拐角区域的三种不同的晶胞实体模型。在适当的边界条件下，使用有限元方法模拟了3D编织复合材料的力学响应。给出了三个单元格模型的变形和应力分布，并详细研究了编织角度和纤维体积分数对3D编织复合材料弹性常数的影响。数值结果表明，这三个晶胞具有独特的特性，表面晶胞和角晶胞比内部晶胞更硬。因此，必须考虑表面和拐角区域对3D编织复合材料机械性能的影响，以便获得准确的结果。计算结果表明与现有实验数据吻合良好，从而验证了所提出的三种单位细胞模型的适用性。

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  • 来源
    《Composite Structures》 |2013年第4期|130-142|共13页
  • 作者

    Chao Zhang; Xiwu Xu;

  • 作者单位

    State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, China,Mailbox 261, No. 29, Yudao Street, Nanjing 210016, China;

    State Key Laboratory of Mechanics and Control of Mechanical Structures, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    3D braided composites; three unit-cell; elastic properties; stress distribution; finite element analysis;

    机译：3D编织复合材料;三个单位单元;弹性应力分布有限元分析;

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