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Elevated-temperature fracture resistances of monolithic and composite ceramics using chevron-notched bend testsThe quasi-static fracture behaviors of monolithic ceramics (SiC, Si3N4, MgAl2O4), self-reinforced monoliths (acicular grained Si3N4, acicular grained mullite), and ceramic matrix composites (SiC whisker/Al2O3 matrix, TiB2 particulate/SiC matrix, SiC fiber/CVI SiC matrix, Al2O3 fiber/CVI SiC matrix) were measured over the temperature range of 20 to 1400 C. The chevron notched, bend bar test geometry was essential for characterizing the elevated temperature fracture resistances of this wide range of quasi-brittle materials during stable crack growth. Fractography revealed the differences in the fracture behavior of the different materials at the various temperatures. The fracture resistances of the self-reinforced monoliths were comparable to those of the composites and the fracture mechanisms were found to be similar at room temperature. However at elevated temperatures the differences of the fracture behavior became apparent where the superior fracture resistance of the self-reinforced monoliths were attributed to the minor amounts of glassy, intergranular phases which were often more abundant in the composites and affected the fracture behavior when softened by elevated temperatures.
Document ID
19930054891
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ghosh, Asish
(Philips Display Components Co. Ann Arbor, MI, United States)
Jenkins, Michael G.
(NASA Lewis Research Center Cleveland, OH, United States)
Ferber, Mattison K.
(Oak Ridge National Lab. TN, United States)
Peussa, Jouko
(Federation of Finnish Metal, Engineering, and Electronic Technology Industries Helsinki, Finland)
Salem, Jonathan A.
(NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Fracture mechanics of ceramics. Vol. 10 - Fracture fundamentals, high-temperature deformation, damage, and design; Proceedings of the 5th International Symposium, Nagoya, Japan, July 15-17, 1991 (
Publisher: Plenum Press
Subject Category
Nonmetallic Materials
Accession Number
93A38888
Funding Number(s)
CONTRACT_GRANT: DE-AC05-84OR-21400
Distribution Limits
Public
Copyright
Other

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