Strengthening, crack arrest and multiple cracking in brittle materials using residual stresses
Embodiments include a method for forming a glass which displays visible cracking prior to failure when subjected to predetermined stress level that is greater than a predetermined minimum stress level and less than a failure stress level. The method includes determining a critical flaw size in the glass and introducing a residual stress profile to the glass so that a plurality of visible cracks are formed prior to failure when the glass is subjected to a stress that is greater than the minimum stress level and lower than the critical stress. One method for forming the residual stress profile includes performing a first ion exchange so that a first plurality of ions of a first element in the glass are exchanged with a second plurality of ions of a second element that have a larger volume than the first ions. A second ion exchange is also performed so that a plurality of the second ions in the glass are exchanged back to ions of the first element.
- Research Organization:
- Pennsylvania State Univ., University Park, PA (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FG02-86ER45252
- Assignee:
- The Penn State Research Foundation (University Park, PA)
- Patent Number(s):
- 6,516,634
- Application Number:
- 09/502,284
- OSTI ID:
- 879644
- Resource Relation:
- Patent File Date: 2000 Feb 11
- Country of Publication:
- United States
- Language:
- English
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