SYMPOSIA PAPER Published: 01 January 1984
STP32726S

A Computer-Assisted Technique for Measuring Relationships

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We developed a computer-assisted data collection technique for flatjackloaded, short-rod specimens to readily obtain crack velocity V as a function of stress intensity factor KI. The technique facilitates the study of stress corrosion in glass and ceramic materials and allows us to determine the crack velocity at which the critical stress intensity factor is evaluated. The experimental apparatus included (1) a stepper motor to automate pressurization of the flatjack and (2) a digital oscilloscope to acquire information about the flatjack pressure and sample displacement at preselected time intervals.

We conducted fracture experiments using samples of soda-lime-silicate float glass and alumino-borosilicate glass (Corning 7809 Solar Glass) in an environmental chamber at 25°C and 30% relative humidity. We found that the critical stress-intensity factor for float glass, extrapolated to a crack velocity of 0.1 m/s, was 0.77 MPa m1/2 compared to 0.81 MPa m1/2 for the solar glass. Comparison of KI versus V data for the two glasses showed that the coefficient n in the empirical relationship V = AKIn is 27.5 for the solar glass and 18 for float glass.

Author Information

Coyle, RT
Solar Energy Research Institute, Golden, Colo.
Buhl, ML
Solar Energy Research Institute, Golden, Colo.
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Details
Developed by Committee: E08
Pages: 134–151
DOI: 10.1520/STP32726S
ISBN-EB: 978-0-8031-4917-5
ISBN-13: 978-0-8031-0401-3