US 11,906,482 B2
Edge strength testing of free-form glass panel
Gabriel Pierce Agnello, Corning, NY (US); Chong Pyung An, Painted Post, NY (US); Zhenxing Hu, Painted Post, NY (US); Bosun Jang, Painted Post, NY (US); Peter Knowles, Elmira, NY (US); Balamurugan Meenakshi Sundaram, Painted Post, NY (US); Douglas Miles Noni, Jr., Horseheads, NY (US); Richard Sean Priestley, Painted Post, NY (US); and Jamie Todd Westbrook, Sayre, PA (US)
Assigned to Corning Incorporated, Corning, NY (US)
Filed by CORNING INCORPORATED, Corning, NY (US)
Filed on Apr. 22, 2021, as Appl. No. 17/237,437.
Application 17/237,437 is a continuation in part of application No. 17/285,587, previously published as PCT/US2020/031553, filed on May 6, 2020.
Claims priority of provisional application 62/959,559, filed on Jan. 10, 2020.
Claims priority of provisional application 62/852,677, filed on May 24, 2019.
Claims priority of provisional application 62/848,091, filed on May 15, 2019.
Prior Publication US 2021/0239584 A1, Aug. 5, 2021
Int. Cl. G01N 3/20 (2006.01); G01N 3/06 (2006.01)
CPC G01N 3/20 (2013.01) [G01N 3/068 (2013.01); G01N 2203/0023 (2013.01); G01N 2203/0282 (2013.01); G01N 2203/0647 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An apparatus for testing edge strength of a sheet of material having a maximum width, the apparatus comprising:
a plurality of assemblies comprising two opposing assemblies, wherein a first of the two opposing assemblies comprises a single cylindrical roller member for engaging a first side of the sheet, and a second of the two opposing assemblies comprises two spaced-apart cylindrical roller members for engaging a second side of the sheet opposite the first side and selectively applying a 3-point bending load on 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;
wherein each of the cylindrical roller members are longer than the maximum width of the sheet of material so that the full width of the sheet of material can be engaged by the three rollers;
wherein the cylindrical roller members are arranged so that their rolling axes are parallel to each other and equidistant from each other;
wherein the two spaced-apart roller members define the test region between the two spaced-apart roller members;
a detection mechanism configured to optically measure 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, wherein a pattern provided on the surface of the sheet of material in the test region facilitates optically measuring the strain in the sheet of material; and
a processor that is configured to determine stress in the sheet of material based on the measured strain.