Failure of Glass Under Biaxial Loading.
Abstract
The report presents the results of two studies on the fracture behavior of glass at elevated pressures. One was conducted in an inert environment at pressures up to 20 kbar. The other was conducted in water at pressures up to 7 kbar. Fracture mechanics techniques were used in both studies. In inert environment the fracture surface energy of three glass compositions was found to be independent of pressure suggesting that no change in the fracture mechanism occurs as a result of pressure. The brittle behavior of glass thus differs from plastics and metals which are observed to become stronger and more ductile with increasing pressure. The fracture behavior of glass in water was also observed to be insensitive to pressure. It is suggested that the reason for this null effect results from compensating mechanisms, in which the increase in fracture resistance arising from a positive activation volume for stress corrosion cracking process is balanced by a decrease in fracture resistance due to increased hydroxyl ion concentration at the crack tip. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1970
- Accession Number
- AD0717952
Entities
People
- H. Johnson
- S. M. Wiederhorn
Organizations
- National Institute of Standards and Technology