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In Situ Strength Model for Continuous Fibers and Multi-Scale Modeling the Fracture of C/SiC Composites

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Abstract

A new in situ strength model of carbon fibers was developed based on the distribution of defects to predict the stress-strain response and the strength of C/SiC composites. Different levels of defects in the fibers were considered in this model. The defects in the fibers were classified by their effects on the strength of the fiber. The strength of each defect and the probability that the defect appears were obtained from the tensile test of single fibers. The strength model of carbon fibers was combined with the shear-lag model to predict the stress-strain responses and the strengths of fiber bundles and C/SiC minicomposites. To verify the strength model, tensile tests were performed on fiber bundles and C/SiC minicomposites. The predicted and experimental results were in good agreement. Effects of the fiber length, the fiber number and the heat treatment on the final strengths of fiber bundles and C/SiC minicomposites were also discussed.

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Acknowledgements

This work was supported by the National Key Research and Development Program of China [grant number 2017YFB0703200]; the National Natural Science Foundation of China [grant numbers 51575261, 51675266]; the Funding of Jiangsu Innovation Program for Graduate Education [grant number KYLX_0300]; and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

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Authors and Affiliations

  1. Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology, Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, 29 Yudao St, Nanjing, 210016, People’s Republic of China

    Sheng Zhang, Xiguang Gao & Yingdong Song

  2. State Key Laboratory of Mechanics and Control Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, People’s Republic of China

    Yingdong Song

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  1. Sheng Zhang
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  2. Xiguang Gao
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Correspondence to Xiguang Gao or Yingdong Song.

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Zhang, S., Gao, X. & Song, Y. In Situ Strength Model for Continuous Fibers and Multi-Scale Modeling the Fracture of C/SiC Composites. Appl Compos Mater 26, 357–370 (2019). https://doi.org/10.1007/s10443-018-9696-y

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