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Modeling the Tensile Behavior of Unidirectional C/SiC Ceramic-Matrix Composites

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The uniaxial tensile behavior of unidirectional C/SiC ceramic-matrix composites at room temperature has been investigated. An approach to predicting the uniaxial tensile stress–strain curve of the unidirectional ceramicmatrix composites is developed. The Budiansky–Hutchinson–Evans shear lag model is used to describe the microstress field of damaged composites. A statistical matrix cracking model, a fracture mechanics interface debonding criterion, and a statistical fiber failure model are used to determine the spacing of matrix cracks, the debonded length of interface, and the volume fraction of failed fibers. By combining the shear lag model and the three damage models, the stress–strain curve at each damage stage is constructed and an exact method for predicting the toughness and strength of the composites is established. The tensile stress–strain curves predicted by the present analysis agree well with experimental data.

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Acknowledgements

This work was sponsored by the Postdoctoral Science Foundation of China (Grant No. 2012M511274) and the Introduction of Talents Scientific Research Foundation of Nan**g University of Aeronautics and Astronautics (Grant No. 56YAH12034). The authors also thank the anonymous reviewers and the editor for their valuable comments.

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Authors and Affiliations

  1. College of Civil Aviation, Nan**g University of Aeronautics and Astronautics, Nan**g, China

    L. B. Li & Y. Ch. Sun

  2. College of Energy and Power Engineering, Nan**g University of Aeronautics and Astronautics, Nan**g, China

    Y. D. Song

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  1. L. B. Li
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  2. Y. D. Song
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  3. Y. Ch. Sun
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Correspondence to L. B. Li.

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Russian translation published in Mekhanika Kompozitnykh Materialov, Vol. 49, No. 6, pp. 985-1004, November-December, 2013.

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Li, L.B., Song, Y.D. & Sun, Y.C. Modeling the Tensile Behavior of Unidirectional C/SiC Ceramic-Matrix Composites. Mech Compos Mater 49, 659–672 (2014). https://doi.org/10.1007/s11029-013-9382-y

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  • DOI: https://doi.org/10.1007/s11029-013-9382-y

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