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Proceedings Paper

Use of Grafoil in mechanical testing of sapphire at elevated temperatures
Author(s): Svetlana G. Ivanova; Frederick Schmid; Chandra P. Khattak; Daniel C. Harris
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Paper Abstract

Flexure strength testing of single crystal sapphire was conducted in the 500 - 600 degree(s)C temperature range using thin sheets of GrafoilTM to reduce failures due to the contact stresses at the loading points. Load-point failures occur often in high temperature testing of sapphire when twinning mechanisms activate above 500 degree(s)C. Bend bars of three different orientations were tested, and the flexure strength was found to be strongly dependent on the orientation type both in Grafoil and non-Grafoil tests. Use of Grafoil increases measured flexure strength up to the factor of three due to the reduction of contact stress. The effect of using Grafoil in mechanical testing of sapphire, including flexure strength, compressive strength and biaxial flexure strength testing is discussed.

Paper Details

Date Published: 25 October 2000
PDF: 6 pages
Proc. SPIE 4102, Inorganic Optical Materials II, (25 October 2000); doi: 10.1117/12.405296
Show Author Affiliations
Svetlana G. Ivanova, Crystal Systems, Inc. (United States)
Frederick Schmid, Crystal Systems, Inc. (United States)
Chandra P. Khattak, Crystal Systems, Inc. (United States)
Daniel C. Harris, Naval Air Warfare Ctr. (United States)


Published in SPIE Proceedings Vol. 4102:
Inorganic Optical Materials II
Alexander J. Marker; Eugene G. Arthurs, Editor(s)

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