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RVE Model with Porosity for 2D Woven CVI SiCf/SiC Composites

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Abstract

A representative volume element (RVE) model with porosity for 2D woven chemical vapor infiltration (CVI) SiCf/SiC composites is presented, and its mechanical properties are analyzed. Samples are divided after a tensile test, and their cross sections are scanned with a scanning electron microscope. The size of the feature structure of the RVE model is determined based on the measurement statistics of the feature structure parameters. In accordance with CVI technology, the deposition rates of the matrix in each direction along the surface of fiber bundles are assumed to be similar. The porosity structure is formed naturally when the RVE model is established. The RVE model conforms to the real structure and accurately shows the location and geometric shape of internal porosity. The relative error of the tensile modulus value estimated from the RVE model through the asymptotic expansion homogenization method and experimental data is 3.26%. Therefore, the RVE model is accurate and efficient.

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Acknowledgment

The authors are grateful and in deep debt to the National Key Laboratory of Thermostructure Composite Materials of the Northwestern Polytechnical University for providing the material parameters and tensile samples.

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Authors and Affiliations

  1. School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100191, China

    Xiuli Shen & Longdong Gong

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  1. Xiuli Shen
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  2. Longdong Gong
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Correspondence to Longdong Gong.

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Shen, X., Gong, L. RVE Model with Porosity for 2D Woven CVI SiCf/SiC Composites. J. of Materi Eng and Perform 25, 5138–5144 (2016). https://doi.org/10.1007/s11665-016-2393-9

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  • DOI: https://doi.org/10.1007/s11665-016-2393-9

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