Analysis of Micro-mesoscopic Thermo-structural Characteristics of Component Materials of 4D Carbon/carbon Composites

doi:10.3969/j.issn.1000-1093.2020.05.019

Abstract

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

CLC Number:

TB331

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