In situ X-ray monitoring of damage accumulation in SiC/RBSN tensile specimens
The room-temperature tensile testing of silicon carbide fiber reinforced reaction-bonded silicon nitride (SiC/RBSN) composite specimens was monitored by using in-situ X-ray film radiography. Radiographic evaluation before, during, and after loading provided data on the effect of preexisting volume flaws (high density impurities, and local density variations) on the fracture behavior of composites. Results from (O)1, (O)3, (O)5, and (O)8 composite specimens showed that X-ray film radiography can monitor damage accumulations during tensile loading. Matrix cracking, fiber-matrix debonding, and fiber pullout were imaged throughout the tensile loading history of the specimens. Further, in-situ film radiography was found to be a helpful and practical technique for estimating interfacial shear strength between the SiC fiber and the RBSN matrix by the matrix crack spacing method. It is concluded that pretest, in-situ, and post-test radiography can provide for a greater understanding of ceramic matrix composite mechanical behavior, a verification of related experimental procedures, and a validation and development of related analytical models. 14 refs.
- OSTI ID:
- 5944520
- Report Number(s):
- CONF-910162--
- Journal Information:
- Ceramic Engineering and Science Proceedings; (United States), Journal Name: Ceramic Engineering and Science Proceedings; (United States) Vol. 12; ISSN 0196-6219; ISSN CESPD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
AMBIENT TEMPERATURE
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
CRACKS
DAMAGE
DEFECTS
ELECTROMAGNETIC RADIATION
FAILURES
FIBERS
FRACTURE MECHANICS
IMPURITIES
INDUSTRIAL RADIOGRAPHY
IONIZING RADIATIONS
MATERIALS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
MECHANICS
NITRIDES
NITROGEN COMPOUNDS
PNICTIDES
RADIATIONS
SHEAR PROPERTIES
SILICON CARBIDES
SILICON COMPOUNDS
SILICON NITRIDES
TENSILE PROPERTIES
X RADIATION