Determination of Bending Tensile Strength of Thin Glass
Glass with a thickness of 0.55 up to 2.0 mm can be defined as a thin glass or even as ultra-light. On the market there are several suppliers, which offer such thin glass. On the one hand there are e.g. Gorilla Glass produced by Corning Incorporated or Leoflex by AGC, which are pre-stress by chemical treatment and on the other hand there are soda lime silicate glass products, which are pre-stress by thermal or chemical treatment. Not only the design with thin glass causes a totally new kind of thinking, also possible test scenarios for determination of the ultimate bending strength are currently not distinctly regulated in standards. Some existing test set-ups described in standards e.g. EN 1288 (four-point bending test or large ring on ring test) cannot be used for the determination of the ultimate bending tensile strength of thin glass. Different test set-ups published in several papers show possibilities for alternative determination of ultimate bending strength. These different configurations were investigated and analyzed for their applicability for determination of bending strength of thin glass. This paper gives a summary of theoretical investigation and shows results of experimental testing.