Apparatus for testing the strength of sheets made of hard brittle material under tensile stress

US11181453B2 · kind B2 · utility

Assignee

• Schott AG · DE

Inventors

• Martin Lotze · Nieder-Olm, DE
• Thomas Roßmeier · Bodenheim, DE
• Clemens Ottermann · Hattersheim, DE
• Volker Seibert · Hochheim, DE

Key dates

• Filing date: Jan 13, 2020
• Grant date: Nov 23, 2021
• Expiry date: Jan 13, 2040

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2203/0282
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for testing the strength of a sheet-like element having two opposite faces and made of hard brittle material under tensile stress is provided. The method includes passing each of the faces of the element over a roller and thereby bending the element so that each of the faces is subjected to a first tensile stress in a portion in which the opposite face is in contact with a surface of the roller; exerting a second tensile force on the element in the direction of advancement so that both faces are subjected to the second tensile stress of at least 2 MPa so that the first and second tensile stresses add up to define a resultant tensile stress; and monitoring the element and determining whether the element has a defined breaking strength equal to the resultant tensile stress or whether the element breaks under the resultant tensile stress.