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Nozawa, Takashi; Tanigawa, Hiroyasu
International Journal of Applied Ceramic Technology, 7(3), p.304 - 315, 2010/05
Times Cited Count：7 Percentile：39.3(Materials Science, Ceramics)To investigate the crack propagation behavior of quasi-ductile composites, this paper aims to evaluate the fracture resistance by the single-edge notched-bend test and the double notch tensile test. With the preliminary analysis, a new methodology to determine the fracture resistance has been developed based on the non-linear fracture mechanics, separately discussing the effect of irreversible energies. By adopting this method to various SiC/SiC composites, (1) notch insensitivity, (2) no significant size effect, and (3) superior crack tolerance were identified for both test types, depending on the fiber/matrix interfacial bond strength.
Nozawa, Takashi; Tanigawa, Hiroyasu; Park, J.-S.*; Koyama, Akira*
Proceedings of 33rd International Conference on Advanced Ceramics and Composites (CD-ROM), p.65 - 76, 2009/09
SiC/SiC composites are promising candidate materials for various energy industries. One of key issues for their practical application is to develop design basis of quasi-ductile composites. Understanding the crack propagation behavior is therefore essential. For this purpose, determining a fracture resistances undoubtedly important and this paper aims to evaluate this using various types of notched specimens. With the preliminary analysis by the authors, a new methodology to determine the fracture resistance has been developed based on the non-linear fracture mechanics, separately discussing the effect of irreversible energies. By adopting this method for nano-infiltration transient-eutectic-phase sintered (NITE) SiC/SiC composites, several key findings were obtained: (1) notch insensitivity, (2) no significant size effect, and (3) superior crack tolerance.
Nozawa, Takashi; Park, J.-S.*; Tanigawa, Hiroyasu; Koyama, Akira*
no journal, ,
For evaluation on quasi-ductile SiC/SiC composites with failure behavior with irreversible energy consumption, determining a criterion for the failure initiation is important. This study aims to develop a methodology to evaluate failure strength using notched specimens. Results of double-notch tensile tests indicate notch insensitivity of SiC/SiC composites regardless of specimen size. This implies unique failure strength regardless of the presence of notches, giving a good correlation between the strength and energy in composite failure.
