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Full-surface and Non-destructive Quality Control and Evaluation by Using Photoelastic Methods
Data dodania: 01.07.19


In the last years contentions about anisotropies (stress birefringence, which can cause visible appearances within the glass) among customers and manufacturers occurred when using glass products, such as heat-strengthened (HS) or fully tempered glass (FT). Findings from recent research activities show that anisotropies have to be evaluated in various aspects.


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 Fig. 1. Facade with tempered glass panes, left strong anisotropies and right low anisotropy, no polarising filters used (Luxembourg)



Furthermore, it is mandatory to rate anisotropies using a suitable assessment method. Within this article, RWTH Aachen University (RWTH) and University of Applied Science Munich (HSM) present two non-destructive methods, based on photoelasticity, for a full-surface evaluation. It is shown in particular that both methods are suitable for an objective evaluation of anisotropy.


Firstly, a method to determine the edge membrane stresses is demonstrated, followed by the visualization and research of anisotropy within the glass pane.








Benjamin Schaaf, Pietro Di Biase, Markus Feldmann
RWTH Aachen University, Institute of Steel Construction

Christian Schuler, Steffen Dix
University of Applied Science Munich,
Laboratory for Steel and Light Alloy Construction


This work was developed within the framework of the research project “Gläsernes Glas” funded by the German Federal Ministry of Economics and Energy (ZF4053101GM5 and ZF4051701GM5) within the framework of the Central Innovation Program “Mittelstand” (ZIM). The authors would like to thank all project partners for the good cooperation.


The article is based on the lecture presented at the GLASS PERFORMANCE DAYS 2017 Conference, which took place on June 28-30, 2017 in Tampere, Finland


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Inne artykuły o podobnej tematyce patrz Serwisy Tematyczne 
Więcej informacji:  Świat Szkła 6/2019



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