Patent ID: 11906483
Assignee: CORNING INCORPORATED
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An apparatus for testing edge strength of a sheet of material comprising:
a plurality of assemblies configured for selectively applying a 3-point bending load along an edge of the sheet of material in a test region of the apparatus, whereby the plurality of assemblies can establish a loaded condition on the sheet of material in the test region by applying the 3-point bending load and establish a no-load condition on the sheet of material in the test region by not applying the 3-point bending load;
a detection mechanism configured for optically measuring strain in the sheet of material in the test region when the sheet of material is in the no-load condition and when the sheet of material is in the loaded condition, wherein the strain in the loaded condition is produced by the 3-point bending load; and
a processor that is configured for determining stress in the sheet of material based on the measured strain,
wherein a pattern provided on a surface of the sheet in the test region facilitates optically measuring the strain in the sheet of material.