Corning Incorporated
FRANGIBLE GLASS ARTICLES AND METHODS OF MAKING THE SAME

Abstract:

Frangible glass articles having a fracture behavior that resists ejection of glass particles upon fracture. In some embodiments, the frangible glass articles can have a first surface region with a first elastic compressive stress energy per unit area of glass (W.sub.el.sup.comp1), a second surface region with a second elastic compressive stress energy per unit area of glass (W.sub.el.sup.comp2), and a central region with an elastic tensile stress energy per unit area of glass (W.sub.T), where (W.sub.el.sup.comp1+W.sub.el.sup.comp2)-W.sub.T.ltoreq.25 J/m.sup.2. In some embodiments, the frangible glass articles can have a total load ratio (W.sub.i/G.sub.D) less than 6.5 and a total elastic compressive stress energy per unit area of glass (W.sub.C) less than 60% of a total load (W.sub.i), where: W.sub.C=W.sub.el.sup.comp1+W.sub.el.sup.comp2, W.sub.i=W.sub.C+W.sub.T, G.sub.D=4G.sub.1C, and G 1 .times. C = K 1 .times. C 2 .function. ( 1 - v 2 ) E . ##EQU00001## In some embodiments, the frangible glass articles can have a differential load ratio (W.sub.d/G.sub.IC) less than 7 .times. 2 .times. e ( - 1 .times. 2 .times. d .times. 1 t ) . ##EQU00002##