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US 11,112,833 B2Granted
Method for measuring fracture toughness of glass
AssigneeCorning Incorporated
InventorsEmily Marie Aaldenberg, Jared Seaman Aaldenberg
Life of this patent
Estimating the term…
Abstract
Glass-based articles are provided that exhibit improved drop performance. The relationship between properties attributable to the glass composition and stress profile of the glass-based articles are provided that indicate improved drop performance.
Claims20
A method of measuring fracture toughness of glass, comprising:
- sub-critically growing a crack in a sample of a glass until a ratio of crack length to half of a width of the sample is greater than 1.5;
- after sub-critically growing the crack, pinning the crack;
- after pinning the crack, fracturing the sample by increasing load on the sample until failure;
- and
- calculating fracture toughness of the glass as a function of the load at failure and dimensions of the sample.
2 more elements
A method of measuring fracture toughness of glass, comprising:
- cutting an initial crack through a web and within a guiding groove of a sample of glass, wherein the sample is rectangular, a first thickness of the sample is between 0.3 mm and 1 mm, the sample has two major surfaces, the guiding groove extends down a length of the sample and down both major surfaces to form the web, wherein the web has a second thickness that is less than the first thickness,
- sub-critically growing a crack in the sample, wherein the crack is sub-critically grown until a ratio of crack length to half of a width of the sample is greater than 1.5;
- after sub-critically growing the crack, pinning the crack, wherein the pinning comprises wicking an agent into the crack along a length of the crack, wherein the agent is toluene;
- after pinning the crack, fracturing the sample by increasing load on the sample until failure;
- and
- calculating fracture toughness of the glass as a function of the load at failure and dimensions of the sample, wherein the dimensions used in calculating the fracture toughness include the first and second thicknesses, wherein the fracture toughness is calculated by calculating applied stress intensity of the glass.
3 more elements
A method of measuring fracture toughness of glass, comprising:
- cutting an initial crack through a web and within a guiding groove of a sample of glass, wherein the sample is rectangular, a first thickness of the sample is between 0.3 mm and 1 mm, the sample has two major surfaces, the guiding groove extends down a length of the sample and down both major surfaces to form the web, wherein the web has a second thickness that is less than the first thickness,
- sub-critically growing a crack in the sample;
- after sub-critically growing the crack, pinning the crack, wherein the pinning comprises wicking an agent into the crack along a length of the crack, wherein the agent is toluene;
- after pinning the crack, fracturing the sample by increasing load on the sample until failure;
- and
- calculating fracture toughness of the glass as a function of the load at failure and dimensions of the sample, wherein the dimensions used in calculating the fracture toughness include the first and second thicknesses, wherein the fracture toughness is calculated by calculating applied stress intensity of the glass.
3 more elements
Dependencies are inferred from the claim text.