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Transverse Strength of SCS-6 Silicon Carbide FibersA diametral compression test was used to measure the transverse strength of SCS-6 SiC fibers before and after heat treatment. Subjecting fibers to diametral compression successfully produced transverse tensile failure in the form of fiber cracking along the same diametral plane in which the compressive load was applied. An analysis of the hoop stress along the diametral plane, in which the effects of the C core were included, showed that there is a large tensile
hoop stress concentration in the SiC sheath at the interface between the C core and the SiC sheath, where the stress is 6.3 times greater than the stress present in a solid SiC fiber under identical loading. This high tensile hoop stress concentration promotes crack initiation near the core and significantly limits the capability of these fibers to withstand transverse compressive loading. The maximum tensile hoop stresses, located at the interface between the C core and SiC
sheath, at the measured failure loads were 850 MPa for the as-received SCS-6 fiber and 1210 MPa for fibers exposed to a 1-h heat treatment at 1850°C in 138 MPa of Ar.
Document ID
Acquisition Source
Johnson Space Center
Document Type
Reprint (Version printed in journal)
Jeffrey I. Eldridge
(Lewis Research Center Cleveland, Ohio, United States)
Jonathan P. Wiening
(University of Virginia Charlottesville, Virginia, United States)
Terry S. Davison
(University of Virginia Charlottesville, Virginia, United States)
Marek-Jerzy Pindera
(University of Virginia Charlottesville, Virginia, United States)
Date Acquired
August 18, 2013
Publication Date
December 1, 1993
Publication Information
Publication: Journal of the American Ceramic Society
Publisher: Wiley / American Ceramic Society
Volume: 76
Issue: 12
Issue Publication Date: December 1, 1993
ISSN: 0002-7820
e-ISSN: 1551-2916
Subject Category
Nonmetallic Materials
Report/Patent Number
Funding Number(s)
CONTRACT_GRANT: N000014-91-3-4089
Distribution Limits
Portions of document may include copyright protected material.
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