轴编炭/炭复合材料组分材料的微细观热结构特性分析

doi:10.3969/j.issn.1000-1093.2020.05.019

摘要/Abstract

摘要： 为研究轴编炭/炭（C/C）复合材料组分材料的微细观热结构特性，开展了复合材料和组分材料纤维束的微细观形貌表征实验。推导立方体单胞和正六棱柱单胞温度周期性边界条件的表达式，建立了组分材料纤维束的代表性体积单元（RVE）计算模型；以均匀化理论和周期性边界条件为基础，在各向同性材料计算模型上验证了所提预测等效热结构参数方法的正确性；研究轴编C/C复合材料纤维束不同类型RVE模型的热结构特性，与实验数据进行了对比分析。结果表明：利用扫描电镜可以得到轴编C/C复合材料和组分材料纤维束的微细观形貌特征，纤维单丝在纤维束内是随机任意分布的状态；通过提出的预测等效热结构参数方法分析了纤维束不同RVE模型的计算精度，该方法也同样适合于其他复合材料等效热结构性能的计算；纤维束RVE模型等效热结构参数在横向满足各向同性的性质。

关键词: 轴编炭/炭复合材料, 热结构特性, 代表性体积单元, 微细观尺度, 周期性边界条件

Abstract: The micro-mesoscopic morphologies of composites and component materials are characterized experimentally to study the micro-mesoscopic thermo-structural characteristics of component materials of four-directional carbon/carbon (C/C) composites. The equations of periodic temperature boundary conditions for cubic and hexagonal unit cells are derived. A representative volume element (RVE) model of fiber bundle is established. Based on the homogenization theory and periodic boundary conditions, the proposed method for predicting effective thermo-structural parameters is verified on the isotropic RVE model. The thermo-structural characteristics of different types of RVEs of fiber bundle are studied and compared with the experimental results. The results show that scanning electron microscopy (SEM) can be used to obtain the micro-mesoscopic morphologies of fiber bundle and the 4D C/C composites. The fiber monofilaments are randomly distributed in the fiber bundle. The predicted accuracy of different RVEs of fiber bundle is analyzed by using the proposed method. The method is also suitable for predicting the effective thermo-structural properties of other composites. The effective thermo-structural parameters of fiber bundle RVE satisfy the isotropic properties in the transverse direction. Key

Key words: four-directionalcarbon/carboncomposites, thermo-structuralcharacteristic, representativevolumeelement, micro-mesoscopic, periodicboundarycondition

中图分类号:

TB331

朱昭君，强洪夫，王哲君. 轴编炭/炭复合材料组分材料的微细观热结构特性分析[J]. 兵工学报, 2020, 41(5): 996-1006.

ZHU Zhaojun, QIANG Hongfu, WANG Zhejun. Analysis of Micro-mesoscopic Thermo-structural Characteristics of Component Materials of 4D Carbon/carbon Composites[J]. Acta Armamentarii, 2020, 41(5): 996-1006.

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第41卷第5期2020 年5月兵工学报ACTA
ARMAMENTARIIVol.41No.5May2020

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