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Micro-CT Characterization on the Meso-Structure of Three-Dimensional Full Five-Directional Braided Composite

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Abstract

The meso-structure is important in predicting mechanical properties of the three-dimensional (3D) braided composite. In this paper, the internal structure and porosity of three-dimensional full five-directional (3DF5D) braided composite is characterized at mesoscopic scale (the scale of the yarns) using micro-computed tomography (micro-CT) non-destructively. Glass fiber yarns as tracer are added into the sample made of carbon fiber to enhance the contrast in the sectional images. The model of tracer yarns is established with 3D reconstruction method to analyze the cross-section and path of yarns. The porosities are reconstructed and characterized in the end. The results demonstrate that the cross sections of braiding yarns and axial yarns change with the regions and the heights in one pitch of 3DF5D braided composites. The path of braiding yarns are various in the different regions while the axial yarns are always straight. Helical indentations appear on the surfaces of the axial yarns because of the squeeze from braiding yarns. Moreover, the porosities in different shapes and sizes are almost located in the matrix and between the yarns.

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Authors and Affiliations

  1. Shanghai Electric Wind Power Equipment Co. Ltd, Shanghai, China

    Jixuan Ya

  2. Beihang University, Beijing, China

    Zhenguo Liu & Yuanhang Wang

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  1. Jixuan Ya
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  2. Zhenguo Liu
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  3. Yuanhang Wang
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Correspondence to Jixuan Ya.

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Ya, J., Liu, Z. & Wang, Y. Micro-CT Characterization on the Meso-Structure of Three-Dimensional Full Five-Directional Braided Composite. Appl Compos Mater 24, 593–610 (2017). https://doi.org/10.1007/s10443-016-9528-x

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  • DOI: https://doi.org/10.1007/s10443-016-9528-x

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