SYMPOSIA PAPER Published: 01 January 2002
STP10828S

Specimen Size Effects on Tensile Properties of 2D/3D SiC/SiC Composites

Source

Miniaturization of tensile specimen is investigated as one of the important methods to evaluate tensile properties of ceramic matrix composites such as SiC/SiC composites, which are attractive materials for fusion applications. For the establishment of small specimen test techniques, specimen size effects on the tensile properties for P/W, S/W and 3-D SiC/SiC composites were investigated. For 3-D composites, whose failure was characteristic in the sequences of statistical fiber fractures, tensile properties were significantly dependent on specimen size. Decreases of tensile strength due to the weakest link concept, the ratio of damage area, and stress concentration due to the local load sharing theory could be observed. For 2-D SiC/SiC composites, dependencies of tensile properties on specimen size were dissimilar to that for 3-D ones and much smaller, because they failed with another failure mode due to the structural restrictions by weaving fiber bundles, and hence this made it difficult to show fiber strength sufficiently.

Author Information

Nozawa, T
Graduate School of Energy Science, Kyoto University, Kyoto, Japan
Hinoki, T
Graduate School of Energy Science, Kyoto University, Kyoto, Japan
Katoh, Y
Institute of Advanced Energy, Kyoto University, Kyoto, Japan CREST-ACE, Japan Science and Technology Corporation, Saitama, Japan
Kohyama, A
Institute of Advanced Energy, Kyoto University, Kyoto, Japan CREST-ACE, Japan Science and Technology Corporation, Saitama, Japan
Lara-Curzio, E
Oak Ridge National Laboratory, Oak Ridge, TN
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Developed by Committee: E10
Pages: 294–305
DOI: 10.1520/STP10828S
ISBN-EB: 978-0-8031-5465-0
ISBN-13: 978-0-8031-2897-2