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The factors causing a spontaneous failure of thermally treated glass are examined. In this way the authors made a stress analysis. The behaviour of NiS inclusions in the glass, surface damages (scratches), the membrane stresses are described in detail. The stresses caused by NiS inclusions are influenced by the size of the NiS particle, the purity, the location, the glass thickness, the toughening stresses, the environmental temperature, the membrane stresses that are generated as a function of the wind loading, and the panel size and aspect ratio. The different mechanical and thermal properties of glass and the NiS are listed and the development of tempering stresses is described. Glass in buildings is subjected to lateral pressures from wind, which caused membrane stresses (in-plane stresses). The aspect ratio of the plate is critical for the determination of the in-plane stresses . The in-plane stresses acting in the vicinity of the NiS stone can enhance the nucleation of the original flaw that was probably caused by the alpha-beta phase transition of NiS during heat treatment. A fracture mechanical study and the surface degradation by scratches as well as an investigation of failures in existing glass buildings is given. The membrane stresses in monolithic glass plates of different sizes and a glass thickness of 6 mm subjected to a maximum design wind pressure of 2.5 kPa are calculated. The spontaneous failure due to NiS is due to three different forces, namely the volumetric expansion due to phase chance, the relative thermal stresses of NiS and the glass and the external induced membrane stresses due to lateral pressures.
The factors causing a spontaneous failure of thermally treated glass are examined. In this way the authors made a stress analysis. The behaviour of NiS inclusions in the glass, surface damages (scratches), the membrane stresses are described in detail. The stresses caused by NiS inclusions are influenced by the size of the NiS particle, the purity, the location, the glass thickness, the toughening stresses, the environmental temperature, the membrane stresses that are generated as a function of the wind loading, and the panel size and aspect ratio. The different mechanical and thermal properties of glass and the NiS are listed and the development of tempering stresses is described. Glass in buildings is subjected to lateral pressures from wind, which caused membrane stresses (in-plane stresses). The aspect ratio of the plate is critical for the determination of the in-plane stresses . The in-plane stresses acting in the vicinity of the NiS stone can enhance the nucleation of the original flaw that was probably caused by the alpha-beta phase transition of NiS during heat treatment. A fracture mechanical study and the surface degradation by scratches as well as an investigation of failures in existing glass buildings is given. The membrane stresses in monolithic glass plates of different sizes and a glass thickness of 6 mm subjected to a maximum design wind pressure of 2.5 kPa are calculated. The spontaneous failure due to NiS is due to three different forces, namely the volumetric expansion due to phase chance, the relative thermal stresses of NiS and the glass and the external induced membrane stresses due to lateral pressures.
Factors that influence spontaneous failure in thermally treated glass - nickel sulphide
Faktoren, die das spontane Versagen von thermisch behandeltem Glas beeinflussen
Jacob, L. (author)
1997
5 Seiten, 1 Bild, 3 Tabellen, 6 Quellen
Conference paper
English
Wärmebehandlung , Versagen , Einflussgröße , Glas , Fassadenverkleidung , Nickelsulfid , Einschluss , Spontanbruch , Steinchen (Fehler) , Eigenspannung , Phasenumwandlung , Wärmedehnung , thermische Spannung , Wind , Bruchmechanik , Verkratzen , Oberflächenfehler , Korngröße , vorgespanntes Glas , Umgebungsbedingung , Dicke , Druckbeanspruchung , Oberflächenspannung
Factors That Influence Spontaneous Failure in Thermally Treated Glass - Nickel Sulphide
| British Library Conference Proceedings | 1997
| Springer Verlag | 2018
| Springer Verlag | 2018