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Proceedings Paper

Slow crack growth and fracture toughness of sapphire for a window application
Author(s): Jonathan A. Salem; Lynn M. Powers; Robert Allen; Anthony Calomino
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Paper Abstract

The slow crack growth parameters, fracture toughness, and inert strength of the r-and a-planes of sapphire were measured in water in order to perform a life prediction on a pressurized sapphire window. The window is being considered for use in a combustion chamber on the International Space Station. Sapphire is relatively susceptible to stress corrosion in water despite a large strength in the absence of humidity. Two life prediction approaches were considered: a deterministic fracture mechanics approach and a Weibull based reliability approach. Preliminary results indicate that the window is feasible if a short finish is avoided. Fractography and additional predictions are being performed.

Paper Details

Date Published: 7 September 2001
PDF: 12 pages
Proc. SPIE 4375, Window and Dome Technologies and Materials VII, (7 September 2001); doi: 10.1117/12.439192
Show Author Affiliations
Jonathan A. Salem, NASA Glenn Research Ctr. (United States)
Lynn M. Powers, NASA Glenn Research Ctr. (United States)
Robert Allen, NASA Glenn Research Ctr. (United States)
Anthony Calomino, NASA Glenn Research Ctr. (United States)


Published in SPIE Proceedings Vol. 4375:
Window and Dome Technologies and Materials VII
Randal W. Tustison, Editor(s)

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