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In situ X-ray monitoring of damage accumulation in SiC/RBSN tensile specimensThe 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.
Document ID
19910072319
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Baaklini, George Y.
(NASA Lewis Research Center Cleveland, OH, United States)
Bhatt, Ramkrishna T.
(NASA Lewis Research Center; U.S Army, Propulsion Directorate, Cleveland OH, United States)
Date Acquired
August 14, 2013
Publication Date
August 1, 1991
Publication Information
Publication: Ceramic Engineering and Science Proceedings
Volume: 12
ISSN: 0196-6219
Subject Category
Composite Materials
Accession Number
91A56942
Distribution Limits
Public
Copyright
Other

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