A study of the effect of the ion exchange method of chemical tempering on a macroflaw in soda-lime glass.
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Author
Liedmandt, Michael Jerome
Date
1971-09Advisor
Leonesio, Robert B.
Second Reader
Thornton, Edward B.
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Show full item recordAbstract
In recent years much research has gone into determining
the behavior of glass which makes it adaptable for structural
use in submersible vehicles and for oceanographic instrumentation
packages. This work examines the strengthening
effect of the ion exchange method of chemical tempering on a
macroflaw in glass. Use of a macroflaw allows a quantitative
fracture mechanics analysis of the amount of strengthening.
Precracked soda-lime glass specimens were treated
for various lengths of time in a potassium nitrate salt bath
held at 365°C. The behavior of the macroflaw while being
treated and at fracture was closely observed. The strain
energy release rale, G(c) , and the fracture toughness, K(c),
were found by using the double cantilever cleavage technique
of measuring fracture surface energies. The average
strengthening which occurred at this temperature was found
to be almost linear with time with a maximum increase of
G(c) of approximately 300 per cent at twenty-four hours. The
diffusion of ions was determined to be inward from the sides
of the flaw rather than across the entire flaw tip.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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