Accession Number:

AD0743087

Title:

A Study of the Effect of the Ion Exchange Strengthening Method on Macroflaws in Soda-Lime Glass.

Descriptive Note:

Master's thesis,

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s):

• Burcham,William Richard

Report Date:

1972-03-01

Pagination or Media Count:

59.0

Abstract:

The work examines the strengthening effect of the ion exchange method of chemical tempering on two specific types of macroflaws, a thermally blunted crack and a sawcut, in soda-lime glass. The use of these macroflaws permitted a quantitative fracture mechanics analysis of the amount of strengthening produced, and a greater access for ion exchange at the flaw tip then could be afforded by a sharp crack. The specimens were treated for various lengths of time in a potassium nitrate bath at 365C. A double cantilever cleavage technique of measuring fracture surface energy was used to find G sub c, the strain energy release rate. The average increase in G sub c was found to be roughly linear reaching a maximum level of approximately 200 at twelve hours of treatment for the blunted crack specimen type, while a similar maximum of approximately 200 was reached at six hours of treatment for the sawcut specimen type. Author

Descriptors:

• (*GLASS
• *ION EXCHANGE)
• DEEP SUBMERGENCE
• TEMPERING
• DEFECTS(MATERIALS)
• FRACTURE(MECHANICS)
• THESES

Subject Categories:

• Ceramics, Refractories and Glass

Distribution Statement:

APPROVED FOR PUBLIC RELEASE