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首页> 外文学位 >Effective thermal conductivity of fibrous composites: Experimental and analytical study (Graphite composites).
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Effective thermal conductivity of fibrous composites: Experimental and analytical study (Graphite composites).

机译：纤维复合材料的有效导热系数：实验和分析研究（石墨复合材料）。

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摘要

Accurate prediction of the effective thermal conductivity of composite materials is critical in composite technology. A majority of the existing analytical models to predict the effective thermal conductivity are applicable only for composites consisting of isotropic fibers and matrices, perfect fiber-matrix adhesion, and composites free of porosities. Unfortunately, this is not the case for a majority of engineering applications using composite materials. The models that propose bounds for the effective thermal conductivity predict results that are extremely widespread and, consequently, demonstrate limited success. Furthermore, these analytical models are seldom validated by experimentally determined data.; The present model for the transverse effective thermal conductivity of fibrous composites, apart from accounting for the matrix and fiber thermal conductivity, fiber volume fraction, and fiber radius, also considers a finite fiber-matrix thermal conductance value, orthotropic fibers, and composite porosity. The model is not limited to any particular class of composites and may be used to predict the transverse effective thermal conductivity of organic, metallic, and ceramic composites. The factors that critically influence the predicted data are the matrix thermal conductivity, fiber-matrix interfacial conductance, and the fiber volume fraction.; The model is compared to present experimentally determined transverse effective thermal conductivity of composites consisting of different graphite fibers and varying fiber volume fractions in an organic matrix. The model is also compared with published experimental data for metal, organic, and ceramic matrix composites. It is demonstrated that the data predicted by the model compares well with experimentally obtained values.; In order to examine the fiber-matrix interface, fiber volume fraction, fiber radius, and porosities within the composite, a scanning electron microscopy study was undertaken. This study revealed valuable information that helped explain the results obtained.
机译：复合材料的有效导热率的准确预测对于复合技术至关重要。现有的大多数预测有效热导率的分析模型仅适用于由各向同性纤维和基体，完美的纤维-基体粘合力以及无孔隙的复合材料组成的复合材料。不幸的是，大多数使用复合材料的工程应用并非如此。提出有效导热系数界限的模型预测的结果极为广泛，因此，成功率有限。此外，这些分析模型很少通过实验确定的数据进行验证。除了考虑基体和纤维的热导率，纤维的体积分数和纤维的半径之外，本发明的纤维复合材料的横向有效热导率的模型还考虑了有限的纤维-基质热导率值，正交各向异性的纤维和复合物的孔隙率。该模型不限于复合材料的任何特定类别，并且可以用于预测有机，金属和陶瓷复合材料的横向有效导热率。关键影响预测数据的因素是基体导热率，纤维-基质界面电导率和纤维体积分数。将模型与当前实验确定的由有机基质中不同石墨纤维和不同纤维体积分数组成的复合材料的横向有效导热率进行比较。该模型还与金属，有机和陶瓷基复合材料的已发布实验数据进行了比较。证明了该模型预测的数据与实验获得的值具有很好的比较。为了检查复合材料中的纤维-基质界面，纤维体积分数，纤维半径和孔隙率，进行了扫描电子显微镜研究。这项研究揭示了有价值的信息，有助于解释所获得的结果。

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  • 作者

    Mirmira, Srinivas Rangarao.;

  • 作者单位

    Texas A&M University.;

  • 授予单位 Texas A&M University.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 190 p.
  • 总页数 190
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;
  • 关键词

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