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Abstract:	Bei thermisch gebogenen TVG- und ESG-Scheiben konnten in der Vergangenheit bei Schadensfällen und Forschungsprojekten durch Visualisierung mittels Polfilteraufnahmen Unregelmäßigkeiten hinsichtlich der Verteilung der thermischen Vorspannung festgestellt werden. Die Abweichungen von einer homogenen Vorspannungsverteilung steht in Zusammenhang mit nicht konformen Bruchbildern [1]. Bis dato fehlte jedoch eine Interpretationsgrundlage für die Bewertung der Polfilterbilder, da der Zusammenhang zwischen der visualisierten Farbgebung und dem Spannungszustand im Glas unbekannt war. Das Forschungsprojekt “ZIM - Gebogenes Glas“ nahm dies zum Anlass, die Möglichkeiten einer Online-Qualitätskontrolle mit Visualisierung der Vorspannungsverteilung zur Verbesserung der Produktqualität von gebogenem Glas zu untersuchen und zerstörungsfrei Aussagen über das Bruchbild zu treffen. Quality control of heat strengthened and fully tempered glass panels - Use of photoelasticity. In the past irregularities concerning the distribution of prestress in bent heat strengthened and fully tempered glass have been visualized by using polarizing filters. Especially in cases of damages, discrepancies of homogeneous distributions have been detected in polarizing filter images and a correlation between non-conforming fracture pattern has been made. Until now a basis for the interpretation of these irregularities could not be found. Therefore, within the research project “ZIM - bended glass” the product quality of bent glass by using the visualization of the distribution of stress was investigated. The results shall also serve for a future online quality monitoring system. The distribution of stress combined with the visualized colors gives a deeper insight in the resulting fracture patterns of glass.
Source:	Stahlbau 81 (2012), No. 3
Page/s:	226-232
Language of Publication:	German

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