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http://dx.doi.org/10.7734/COSEIK.2021.34.1.51

Multiscale Finite Element Analysis of Needle-Punched C/SiC Composites through Subcell Modeling  

Lim, Hyoung Jun (Department of Mechanical and Aerospace Engineering, Seoul National University)
Choi, Ho-Il (Department of Mechanical and Aerospace Engineering, Seoul National University)
Lee, Min-Jung (Agency for Defense Development)
Yun, Gun Jin (Department of Aerospace Engineering, Seoul National University)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.34, no.1, 2021 , pp. 51-58 More about this Journal
Abstract
In this paper, a multi-scale finite element (FE) modeling methodology for three-dimensional (3D) needle-punched (NP) C/SiC with a complex microstructure is presented. The variations of the material properties induced by the needle-punching process and complex geometrical features could pose challenges when estimating the material behavior. For considering these features of composites, a 3D microscopic FE approach is introduced based on micro-CT technology to produce a 3D high fidelity FE model. The image processing techniques of micro-CT are utilized to generate discrete-gray images and reconstruct the high fidelity model. Furthermore, a subcell modeling technique is developed for the 3D NP C/SiC based on the high fidelity FE model to expand to the macro-scale structural problem. A numerical homogenization approach under periodic boundary conditions (PBCs) is employed to estimate the equivalent behavior of the high fidelity model and effective properties of subcell components, considering geometry continuity effects. For verification, proposed models compare excellently with experimental results for the mechanical behavior of tensile, shear, and bending under static loading conditions.
Keywords
3D needle-punched composites; ceramic matrix composites (CMC); multi-scale modeling; subcell modeling;
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