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Evaluation of strength anisotropy and fracture behavior of UD NITE-SiC/SiC composites with various fiber orientations

  • Received: 30 June 2016 Accepted: 10 October 2016 Published: 14 October 2016
  • A SiC/SiC composite by Nano-infiltration and Transient Eutectic-phase (NITE) process is the attractive candidate materials for advanced energy systems, aero-space system. The NITE process is improved to the industrialization grade process from the laboratory grade process. In order to ensure reliability of products by NITE-SiC/SiC composites, understanding of the strength anisotropy is important. This paper presented the basic strength anisotropy knowledges of unidirectional (UD) type NITE-SiC/SiC composites with various fiber orientations by correlation evaluation of microstructure and mechanical properties. Also, the strength anisotropy evaluation of UD NITE-SiC/SiC composites utilizing the strength anisotropy prediction theories were discussed. The axial/off-axial mechanical properties of UD NITE-SiC/SiC composites by the industrialization grade process were evaluated by axial/off-axial tensile test. The mechanical properties of NITE-SiC/SiC composites fabricated tended to decrease with increasing of fiber orientation angle. The experiment results by axial/off-axial tensile test were consistent with the strength anisotropy prediction theories by the maximum normal stress theory and the Tsai-Hill criterion. Also, the failure mode of SiC/SiC composites fabricated with each fiber orientation angle was consistent with fracture surface observation results. The strength anisotropy of UD NITE-SiC/SiC composites was suggested to be able to predict by Tsai-Hill criterion. The basic strength anisotropy of UD SiC/SiC composites was understood.

    Citation: Naofumi Nakazato, Akira Kohyama, Hirotatsu Kishimoto. Evaluation of strength anisotropy and fracture behavior of UD NITE-SiC/SiC composites with various fiber orientations[J]. AIMS Materials Science, 2016, 3(4): 1382-1390. doi: 10.3934/matersci.2016.4.1382

    Related Papers:

  • A SiC/SiC composite by Nano-infiltration and Transient Eutectic-phase (NITE) process is the attractive candidate materials for advanced energy systems, aero-space system. The NITE process is improved to the industrialization grade process from the laboratory grade process. In order to ensure reliability of products by NITE-SiC/SiC composites, understanding of the strength anisotropy is important. This paper presented the basic strength anisotropy knowledges of unidirectional (UD) type NITE-SiC/SiC composites with various fiber orientations by correlation evaluation of microstructure and mechanical properties. Also, the strength anisotropy evaluation of UD NITE-SiC/SiC composites utilizing the strength anisotropy prediction theories were discussed. The axial/off-axial mechanical properties of UD NITE-SiC/SiC composites by the industrialization grade process were evaluated by axial/off-axial tensile test. The mechanical properties of NITE-SiC/SiC composites fabricated tended to decrease with increasing of fiber orientation angle. The experiment results by axial/off-axial tensile test were consistent with the strength anisotropy prediction theories by the maximum normal stress theory and the Tsai-Hill criterion. Also, the failure mode of SiC/SiC composites fabricated with each fiber orientation angle was consistent with fracture surface observation results. The strength anisotropy of UD NITE-SiC/SiC composites was suggested to be able to predict by Tsai-Hill criterion. The basic strength anisotropy of UD SiC/SiC composites was understood.


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