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Bend Properties of Sapphire Fibers at Elevated TemperaturesThe effect of temperature on the bend radius that a c-axis-oriented sapphire fiber can withstand was determined for fibers of various diameter. Bend stress rupture tests were performed for times of 1-100 h and temperatures of 300-1700 C. Fibers would survive the bend test undeformed, would fracture or would deform. The bend survival radius was determined to be the radius above which no fibers fractured or deformed for a given time-temperature treatment. It was found that the ability of fibers to withstand curvature decreases substantially with time and increasing temperature and that fibers of smaller diameter (46-83 micron) withstood smaller bend radii than would be expected from just a difference in fiber diameter when compared with the bend results of the fibers of large diameter (144 micron). This was probably due to different flaw populations, causing high temperature bend failure for the tested sapphire fibers of different diameters.
Document ID
19970003753
Acquisition Source
Headquarters
Document Type
Reprint (Version printed in journal)
Authors
Morscher, Gregory N.
(Case Western Reserve Univ. Cleveland, OH United States)
Sayir, Haluk
(Case Western Reserve Univ. Cleveland, OH United States)
Date Acquired
August 17, 2013
Publication Date
January 1, 1995
Publication Information
Publication: Materials Science and Engineering
Publisher: Elsevier Science S.A.
Volume: No A190
ISSN: 0921-5093
Subject Category
Nonmetallic Materials
Report/Patent Number
E-9615
NAS 1.26:202193
NASA-CR-202193
Meeting Information
Meeting: Annual American Ceramic Society Meeting
Location: Minneapolis, MN
Country: United States
Start Date: April 12, 1992
End Date: April 16, 1992
Accession Number
97N70235
Funding Number(s)
PROJECT: RTOP 510-01-50
CONTRACT_GRANT: NCC3-298
CONTRACT_GRANT: NCC3-244
Distribution Limits
Public
Copyright
Public Use Permitted.
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