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5 Werkstofftechnik

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Erscheinungsjahr

  • 2017 (2) (entfernen)

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  • Double cantilever beam (2) (entfernen)

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  • 5 Werkstofftechnik (2) (entfernen)

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New device for inert crack growth measurements in ultra-strong glasses (2017)
Waurischk, Tina
The practical strength of glasses under ambient conditions is substantially lower compared to its intrinsic strength because of sub-critical crack growth (SCCG) from microscopic flaws. While SCCG is related to the humidity of the ambient atmosphere, leading to stress corrosion phenomena, the detailed kinetics are still not fully understood. To get better insight to the contribution of water on the crack-tip, highly water bearing glasses will be investigated by a new device for inert SCCG-measurements using double cantilever beam (DCB) geometry specimens. This device was designed to investigate the stress intensity factor in modus I and crack velocity in vacuum, but different atmospheres can also be introduced. For validation of the new device, first experiments were performed on microscope slides as well as on a soda-lime silicate and a borosilicate crown glass. The results achieved will be presented in comparison to the published results of Wiederhorn.
New device for inert sub-critical crack growth: measurements in crystallized glasses (2017)
Waurischk, Tina
Compared to its intrinsic strength, the practical strength of glasses is substantially lowered by microscopic flaws. Their sub critical growth from the surface is strongly affected by ambient humidity. A new device was designed to enable the observation of sub critical crack growth (SCCG) in vacuum and controlled atmosphere. It allows measurements in transparent and semi-transparent materials in double cantilever beam (DCB) geometry. The aim of the present work is to study the effect of crystals on crack growth.
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