Prediction of the Thermo-Mechanical Properties of the SiC f /SiC RVE Model via FEM and Asymptotic Homogenization Method:
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ORIGINAL PAPER
Prediction of the Thermo‑Mechanical Properties of the SiCf/SiC RVE Model via FEM and Asymptotic Homogenization Method: Process and Implementation Details Xiuli Shen1 · Shuo Zhang1 · Xin Liu2 · Longdong Gong3 · Shaojing Dong1 Received: 22 December 2019 / Accepted: 27 August 2020 © CIMNE, Barcelona, Spain 2020
Abstract The study focuses on characterizing the thermo-mechanical properties of SiCf/SiC using micromechanics finite element method (FEM) and multi-scale thermal–mechanical coupling asymptotic homogenization methods. A multi-scale model of fiber, fiber bundle and 2D woven SiCf/SiC has been established, while the predicted properties of the model are verified with the relevant experiments. The detailed steps to realize the micromechanical FEM are discussed, and the improvement methods have been put forward. To provide an optimal process of the micromechanical FEM based on the general software, different boundary and post-processing conditions are used and compared. Based on the traditional homogenization theory, the multi-scale thermal–mechanical coupling asymptotic homogenization method has also been developed to predict the thermo-mechanical properties of the RVE model with introduced realization. To verify the theoretical method, the properties of the 2D woven SiCf/SiC were predicted using micromechanics FEM and multi-scale thermal–mechanical coupling method, and the experimental analysis was carried out to compare with the predict results. The two methods exhibit errors in predicting the inter-layer directional performance, while the performance in other directions varies only slightly. The error between the most of the predicted values and experimental measurements is approximately 11%.
1 Introduction Silicon carbide ceramic matrix composites (SiCf/SiC) have been widely used in aeroengines due to their high temperature resistance and low density. However, it is generally not * Shaojing Dong [email protected] Xiuli Shen [email protected] Shuo Zhang [email protected] Xin Liu [email protected] Longdong Gong [email protected] 1
School of Energy and Power Engineering, Beihang University, Beijing 100083, China
2
China Academy of Launch Vehicle Technology, Beijing 100076, China
3
Navigation and Control Technology Research Institute of China Ordnance Industries, Beijing 100089, China
possible to obtain the material properties due to the difficulty in fabricating the test specimens to measure the interlaminar properties. The micro-mechanical methods, therefore, have been developed to predict the equivalent thermo-mechanical properties of the composites (including material elasticity, thermal conductivity and thermal expansion coefficient), which can reveal the internal force relationship of the materials and simulate the real damage as well as failure, etc. Thus, the method has gained popularity in the field of composite mechanics in the last 20 years [1, 2]. At present, the micro-mechanical methods for predicting the RVE equivalent performance mainly include micro-m
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