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Title: Strengthening, crack arrest and multiple cracking in brittle materials using residual stresses

Abstract

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.

Inventors:
; ;
Issue Date:
Research Org.:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
879644
Patent Number(s):
6,516,634
Application Number:
09/502,284
Assignee:
The Penn State Research Foundation (University Park, PA)
DOE Contract Number:  
FG02-86ER45252
Resource Type:
Patent
Resource Relation:
Patent File Date: 2000 Feb 11
Country of Publication:
United States
Language:
English

Citation Formats

Green, David J., Sglavo, Vincenzo M., and Tandon, Rajan. Strengthening, crack arrest and multiple cracking in brittle materials using residual stresses. United States: N. p., 2003. Web.
Green, David J., Sglavo, Vincenzo M., & Tandon, Rajan. Strengthening, crack arrest and multiple cracking in brittle materials using residual stresses. United States.
Green, David J., Sglavo, Vincenzo M., and Tandon, Rajan. Tue . "Strengthening, crack arrest and multiple cracking in brittle materials using residual stresses". United States. https://www.osti.gov/servlets/purl/879644.
@article{osti_879644,
title = {Strengthening, crack arrest and multiple cracking in brittle materials using residual stresses},
author = {Green, David J. and Sglavo, Vincenzo M. and Tandon, Rajan},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {2}
}

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Works referenced in this record:

Crack Stability and T-Curves Due to Macroscopic Residual Compressive Stress Profiles
journal, August 1991


Residual Stress Determination Using Strain Gage Measurements
journal, September 1990


Crack Arrest and Multiple Cracking in Glass Through the Use of Designed Residual Stress Profiles
journal, February 1999


The effect of crack growth stability induced by residual compressive stresses on strength variability
journal, March 1992

  • Tandon, Rajan; Green, David J.
  • Journal of Materials Research, Vol. 7, Issue 3
  • DOI: 10.1557/JMR.1992.0765

Determination of Residual Stress Profile Using a Strain Gage Technique
journal, July 1990


Strength variability in brittle materials with stabilizing and destabilizing resistance fields
journal, February 1993