期刊
FUNCTIONAL COMPOSITES AND STRUCTURES
卷 3, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2631-6331/abd7cd
关键词
3D textile composite; thermal conductivity; homogenization; periodic boundary condition; representative volume element
资金
- Ulsan National Institute of Science and Technology (UNIST) [1.200031.01]
Finite element analysis is used to virtually measure the homogenized thermal conductivity of a thick 3D woven textile composite, considering temperature-dependent properties of constituents. A two-step homogenization approach is adopted, first homogenizing at the tow level and then obtaining the anisotropic thermal conductivity through virtual thermal tests.
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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