Method and apparatus for proof testing a sheet of brittle material
AssigneeCorning Incorporated
InventorGregory Scott Glaesemann
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Abstract
Disclosed is a method of proof testing a sheet of brittle material such as a glass or glass-ceramic based material. The method comprises bending the glass sheet over at least one arcuate member to detect sheets having a strength greater than a predetermined value. The method includes imparting a bend to the sheet and producing relative motion between the sheet and the bend such that the bend traverses the sheet, and wherein tensile stress induced in a surface of the sheet by the bend corresponds to the predetermined strength value. An apparatus for performing the proof testing is also disclosed.
Claims20
A method of proof testing a sheet of brittle material comprising imparting a bend to the sheet and producing relative motion between the sheet and the bend such that the bend traverses the sheet, and wherein tensile stress induced in a surface of the sheet by the bend corresponds to a predetermined strength value to detect sheets having a strength greater than the predetermined strength value.
A method of proof testing a glass sheet comprising bending the glass sheet over at least one roller to bend the sheet and produce a tensile stress in a surface of the sheet that corresponds to a predetermined strength value, and producing relative motion between the sheet and the at least one roller such that successive portions of the sheet are subjected to the tensile stress to detect sheets having a strength greater than the predetermined strength value.
An apparatus for proof testing a sheet of brittle material comprising at least one arcuate member for contacting the sheet and inducing a bend in the sheet of brittle material wherein a radius of curvature of the at least one arcuate member is selected such that a tensile stress in a surface of the sheet induced by the bending corresponds to a predetermined strength value to detect sheets having a strength greater than the predetermined value.
Dependencies are inferred from the claim text.