A study of the effect of the ion exchange method of chemical tempering on a macroflaw in soda-lime glass.
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Authors
Liedmandt, Michael Jerome
Subjects
strengthening of glass
ion exchange tempering of glass
double cantilever cleavage of glass
glass tempering and fracture
fracture of glass
ion exchange tempering of glass
double cantilever cleavage of glass
glass tempering and fracture
fracture of glass
Advisors
Leonesio, Robert B.
Date of Issue
1971-09
Date
September 1971
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
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.
Type
Thesis
Description
Series/Report No
Department
Oceanography
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
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.