A study of the effect of the ion exchange method of chemical tempering on a macroflaw in soda-lime glass.
Liedmandt, Michael Jerome
Leonesio, Robert B.
Thornton, Edward B.
MetadataShow full item record
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.
RightsThis 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.
Showing items related by title, author, creator and subject.
Luteran, Andrew M. (Monterey, California. Naval Postgraduate School, 2011-03);This thesis investigates the mechanical behavior of the copper-solder interface when subjected to dynamic axial loads at strain rates between 10.0 s-1 and 0.05 s-1. The copper is alloy 101 and the lead-free solder has a ...
Hamilton, James E. (1987);High Strength Low Alloy (HSLA) steels have been shown to posses high strength and toughness. Additionally, these steels can be welded without the normal preheating required by comparable HY-series steels. HSLA-100, 100 ...
Griffiths, Robert P. (Monterey, California. Naval Postgraduate School, 2007);Two-dimensional continuum modeling and simulations were conducted to predict how the size, quantity, and stiffness of reinforcing particles such as carbon nanotubes (CNTs) affect failure mechanisms at the interface of ...