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A Modified Anti-Symmetric Four-Point Bending Method for Testing C/C Composites under Biaxial Shear and Compression

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Abstract

Carbon fiber-reinforced carbon matrix (C/C) composites are attractive alternative materials for the fabrication of various high-temperature structural components subjected to complex loading conditions. A modified anti-symmetric four-point bending (MAFPB) method for testing a V-notched beam specimen was developed in this study for the investigation of the mechanical behavior of C/C composites under biaxial shear and compression. A finite element model of the specimen was generated to examine the effects of the notch radius and notch spacing on the uniformity and distribution of the stresses in the gauge area. Uniform shear and normal stress were observed in the gauge section of a specimen with a blunted notch and appropriate notch spacing. The three-dimensional (3D) mechanical behaviors of a C/C composite determined by MAFPB tests under pure shear and various biaxial shear–compression stress states were compared with those determined by Iosipescu and off-axis compression experiments. The MAFPB test was found to produce reliable estimates of the mechanical behaviors and failure mechanisms of C/C composites under a wide range of biaxial shear–compression stress states. The shear fracture stress of a 3D C/C composite was particularly observed to significantly decrease with increasing compressive stress component.

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Acknowledgements

The authors gratefully acknowledge the support of the National Natural Science Foundation of China (Grant Nos. 11472092, 11272107, and 11502058) and the National Basic Research Program of China (973 program; Grant No. 2015CB655200).

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Authors and Affiliations

  1. Center for Composite Materials, Harbin Institute of Technology, Harbin, China

    C. H. Xu, X. X. Han, L. Y. Song, S. H. Meng, W. H. Xie & H. Jin

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  1. C. H. Xu
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  2. X. X. Han
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  3. L. Y. Song
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  4. S. H. Meng
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  5. W. H. Xie
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Correspondence to S. H. Meng or W. H. Xie.

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Xu, C.H., Han, X.X., Song, L.Y. et al. A Modified Anti-Symmetric Four-Point Bending Method for Testing C/C Composites under Biaxial Shear and Compression. Exp Mech 58, 515–525 (2018). https://doi.org/10.1007/s11340-017-0351-6

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  • DOI: https://doi.org/10.1007/s11340-017-0351-6

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