均质化(气候)
材料科学
热导率
复合材料
代表性基本卷
周期边界条件
各向异性
热的
边值问题
复合数
有限元法
热导率测量
微观结构
结构工程
数学
热力学
数学分析
光学
生物多样性
工程类
物理
生物
生态学
作者
Hye-gyu Kim,Wooseok Ji
出处
期刊:Functional composites and structures
[IOP Publishing]
日期:2021-01-19
卷期号:3 (1): 015002-015002
被引量:5
标识
DOI:10.1088/2631-6331/abd7cd
摘要
Abstract Finite element analysis is performed to virtually measure homogenized thermal conductivity of a thick 3D woven textile composite (T3DWC). Temperature-dependent thermal and mechanical properties of constituents are considered for the measurements over a wide range of temperature. A two-step homogenization approach is adopted here to simplify the analysis at the microscopic level without losing heterogeneity of the material at the macroscopic scale. First-step homogenization is carried out at a tow level using an analytical homogenization scheme. Fiber tows are homogenized and assigned with effective elastic and thermal properties. The solid tows are then implemented into a representative volume element considering the unique in-plane periodic fiber architecture of the thick composite material. Due to the unique in-plane periodicity, conventional periodic boundary conditions for thermal and mechanical loading conditions are reformulated. Anisotropic thermal conductivity of T3DWC is obtained from the second-step homogenization based on virtual thermal tests performed at ambient to elevated temperatures.
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