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Multi-size unit cells to predict effective thermal conductivities of 3D four-directional braided composites

机译：多种尺寸的晶胞可预测3D四向编织复合材料的有效导热率

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摘要

Based on the structure of the full unit cell which is formulated by three translational symmetries, three further 180 rotational symmetries of three-dimensional (3D) four-directional braided composites are clarified in this paper. It is for the first time that each rotational symmetry is used to reduce the full unit cell to a half, quarter, and eighth size. The corresponding boundary conditions for thermal analysis are derived precisely according to each rotational transformation. The effective thermal conductivities of composites with different fiber volume fractions and interior braiding angles are calculated by the full, quarter and eighth unit cells. In order to confirm the significance of accurate boundary conditions, additional comparison calculations with adiabatic boundary conditions are conducted and the result reveals that inappropriate boundary conditions may lead to an un-neglectable error in the prediction of thermal conduction behaviours. The numerical model is validated by good agreement between the numerical results and the available experimental ones. (C) 2016 Elsevier Ltd. All rights reserved.
机译：基于由三个平移对称性构成的完整晶胞的结构，本文进一步阐明了三维（3D）四向编织复合材料的三个另外的180个旋转对称性。首次使用每个旋转对称性将整个晶胞减小到一半，四分之一和八分之一大小。根据每个旋转变换精确地导出用于热分析的相应边界条件。不同纤维体积分数和内部编织角的复合材料的有效导热率是通过完整，四分之一和第八个晶胞计算的。为了确认精确边界条件的重要性，还进行了带有绝热边界条件的附加比较计算，结果表明不合适的边界条件可能导致热传导行为预测中不可忽略的误差。通过数值结果与可用实验结果之间的良好一致性来验证数值模型。 （C）2016 Elsevier Ltd.保留所有权利。

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  • 来源
    《Composite Structures》 |2017年第3期|152-167|共16页
  • 作者

    Gou Jian-Jun; Fang Wen-Zhen; Dai Yan-Jun; Li Shuguang; Tao Wen-Quan;

  • 作者单位

    Xi An Jiao Tong Univ, Sch Energy & Power Engn, Minist Educ, Key Lab Thermofluid Sci & Engn, Xian 710049, Peoples R China;

    Xi An Jiao Tong Univ, Sch Energy & Power Engn, Minist Educ, Key Lab Thermofluid Sci & Engn, Xian 710049, Peoples R China;

    Xi An Jiao Tong Univ, Sch Energy & Power Engn, Minist Educ, Key Lab Thermofluid Sci & Engn, Xian 710049, Peoples R China;

    Univ Nottingham, Fac Engn, Nottingham NG7 2RD, England;

    Xi An Jiao Tong Univ, Sch Energy & Power Engn, Minist Educ, Key Lab Thermofluid Sci & Engn, Xian 710049, Peoples R 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

    Braided composite; Unit cell; Rotational symmetry; Numerical prediction; Effective thermal conductivity;

    机译：编织复合材料;晶胞;旋转对称性;数值预测;有效导热系数;

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