Slow crack growth and fracture toughness of sapphire for a window application

Jonathan A. Salem; Lynn M. Powers; Robert Allen; Anthony Calomino

doi:10.1117/12.439192

7 September 2001 Slow crack growth and fracture toughness of sapphire for a window application

Jonathan A. Salem, Lynn M. Powers, Robert Allen, Anthony Calomino

Proceedings Volume 4375, Window and Dome Technologies and Materials VII; (2001) https://doi.org/10.1117/12.439192
Event: Aerospace/Defense Sensing, Simulation, and Controls, 2001, Orlando, FL, United States

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.

Citation Download Citation

Jonathan A. Salem, Lynn M. Powers, Robert Allen, and Anthony Calomino "Slow crack growth and fracture toughness of sapphire for a window application", Proc. SPIE 4375, Window and Dome Technologies and Materials VII, (7 September 2001); https://doi.org/10.1117/12.439192

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