$fracture glass frames$

A strong composition dependence is also seen in the crack velocity which, for the strain rate considered, is on the order of 1800 m/s for glasses with low Na concentration and decreases to 650 m/s if the concentration is high. The stress-strain curves demonstrate that silica glass is brittle whereas the glasses rich in Na show pronounced ductility. doi:10.We use large-scale simulations to investigate the dynamic fracture of silica and sodium-silicate glasses under uniaxial tension. Schiavonato, “Correlation between Strength and Measured residual stress in tempered glass products,” Journal of ASTM International, Vol. Hessenkemper, “Kosten und Qualit?tssituation für PVGl?er,” Engineered Transparency-International Conference at Glasstec, Düsseldorf, 29-30 September 2010.Ī. Redner, “Stress Measurement, Fragmentation and Mechanical Strength,” Glass Performance Days, 2005, pp. Akeyoshi, Report of the Research Laboratory, Asahi Glass Company, Ltd., Vol. Stang, “The Fracture Process of Tempered Soda-Lime-Silicate Glass,” Experimental Mechanics, Vol. Hull, “Fractography-observing, measuring and interpreting fracture surface to topography”, Cambridge University Press, Cambridge, 1999, pp. Pace, “Thermally Toughened Safety Glass: Correlation between Flexural Strength, Fragmentation and Surface Compressive Stress,” Glass Performance Days, 2011, pp. Gulati, “Frangibility of Tempered Soda-Lime Glass Sheet,” Glass Performance Days, 1997, pp. Glass, “Fracture Mechanics of Ceramics Active Materials, Nanoscale Materials, Composites, Glass, and Fundamentals,” Springer, Vol. Bubeev, “Prediction of the Character of Tempered Glass Fracture”, Glass and Ceramics, Vol. Kanai, “Mechanical Properties of Tempered Glass,” Proceedings of the 7th International Glass Congress, Vol. Barsom, “Fracture of Tempered Glass,” Journal of the American Ceramic Society, Vol.

$fracture glass frames$

Acloque, “Deferred Processes in the Fragmentation of Tempered Glass,” Proceedings of the 4th International Glass Congress, Vol.

$fracture glass frames$

There- fore, this study confirms that the compressive stress and its depth are essential as key factors contributing to the achievement of a relatively high fragmentation using a thin glass.Ĭomité Européen de Normalisation (CEN), “EN 12150 European Standard: Glass in Building Thermally Toughened Soda-Lime Silicate Glass, Part 1-2,” Comité Européen de Normalisation, Brussels, 2000. 20% of the glass thickness, it is observed that the possibility of producing small fragments is dramatically decreased. By reducing the depth of the compressive layer to less than approx.

$fracture glass frames$

However, the only dif- ference is the depth of the compressive layer.

$fracture glass frames$

Fractography shows that all glasses have a similar characterization on the fractured surface irrespective of glass thickness. By analyzing the residual stress of glasses before and after the fragmentation test, we observe that a relatively thin glass spends more stored energy to generate a new fracture surface and stores less energy for the second cracking as compared to thick glasses. Relatively thin glasses require high compressive stress for producing fragments, and the required compressive stress is increased with decreasing glass thickness (3.2 to 2.1 mm). Breakage patterns, residual stress, and fractured surfaces on tempered glasses are investigated to find the correlation among glass thickness, tempered level, and the number of fragments, particularly when the glass thickness is less than 4 mm.

$fracture glass frames$

Fracture glass frames