Fracture Behavior of Ceramic Materials under Multi-axial Stress
- Paper number
IAC-05-C2.3.01
- Author
Mr. Masaharu Miyata, Japan Aerospace Exploration Agency (JAXA)/ISAS, Japan
- Coauthor
Mr. Masayuki Tsukada, University of Tokyo, Japan
- Coauthor
Prof. Eiichi Sato, Japan Aerospace Exploration Agency (JAXA)/ISAS, Japan
- Coauthor
Prof. Junichi Matsushita, University of Toukai, Japan
- Year
2005
- Abstract
It is under development to apply ceramic materials to a component of space propulsion system, and it is required that the fracture probability of the component is strictly estimated based on multi-axial fracture statistics. In this study, multi-axial fracture behavior was studied in polycrystalline alumina with different grain shape (equiaxed and elongate) and glass from a natural flaw and an artificial crack. Fracture from a natural flaw was studied by biaxial fracture tests in compression and torsion loading; multi-axial fracture statistics was applied to the measured fracture envelope. Artificial crack propagation was studied by mixed-mode fracture toughness tests; four-point bending and diametral compression tests were carried out using precracked and notched specimens with variable precrack lengths. Biaxial Fracture behavior of glass agreed well with crack propagation criterion by the maximum energy release rate theory and the maximum hoop stress theory. That of two kinds of alumina was predicted well by multi-axial fracture statistics with large values of apparent K IIC . For alumina with elongated grains, four-point bending test using a specimen with a precrack larger than 4 mm reproduced the fracture behavior of a natural flaw with appropriate value of K IIC / K IC = 2.7.
- Abstract document
- Manuscript document
IAC-05-C2.3.01.pdf (🔒 authorized access only).
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