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Investigations on the thermorheologically complex material behaviour of the laminated safety glass interlayer ethylene-vinyl-acetate

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Abstract

Laminated safety glass has become an indispensable component in building construction, automotive and solar industry. It consists of at least two glass panes, that are laminated together with a polymeric interlayer. Mechanically speaking, the polymeric interlayer enables a shear transfer between the two glass panes. Here, the difficulty lies in the understanding of the real shear transmission. On the one hand, polymeric interlayers show a time dependent material behaviour, which can be described with a ‘Prony-series’ in the linear viscoelastic area. On the other hand, polymeric interlayers show a temperature dependent material behaviour. Hence, a Prony-series is only valid for one specific temperature. However, since relaxation is based on molecular movements and rearrangement processes, which can be thermally activated, an increase in temperature leads to an acceleration of the relaxation process. The time-temperature correlation can be taken into account by means of a ‘Time-Temperature-Superposition-Principle’ (TTSP). The relaxation curve of a thermorheologically simple material shifts solely horizontal along the time axis due to temperature changes, while its shape remains constant. Mathematically, this means, that all relaxation times of the Prony-series are multiplied by the same shift factor \(a_{{T}}\). Recent research of the authors shows, that some polymeric interlayers don’t follow a simple TTSP. The experimental identification through ‘Dynamical-Mechanical-Thermal-Analysis’ as well as ‘Differential Scanning Caliometry’ and numerical incorporation of this thermorheologically complex material behaviour into state-of-the-art Finite-Element-Software will be investigated on the example of ‘Ethylene-vinyl acetate’ in the following paper.

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Acknowledgements

At this point we would like to thank the following institutions and persons for their valuable support in this work: Dr. Christoph Mittermeier from the Institute of Mechanics (LRT4) of the Faculty of Aerospace at the University of German Armed Forces Munich for the possibility of carrying out DSC experiments, the Institute of Mechanics and Materials Research at THM Giessen for the possibility of carrying out the double-shear DMTA experiment, the Institute of Construction and Building Materials at TU Darmstadt for the possibility of carrying out the DSC tests, the two students Eve Laberge (International Research Experience Program at the TU Darmstadt) and Lars Christ (University of German Armed Forces Munich) for their valuable research work.

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  1. Institute of Structural Mechanics and Design, Technische Universität Darmstadt (Research Institute 1), Darmstadt, Germany

    Miriam Schuster & Jens Schneider

  2. Institute and Laboratory for Structural Engineering, University of German Armed Forces Munich (Research Institute 2), Neubiberg, Germany

    Michael Kraus & Geralt Siebert

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  1. Miriam Schuster
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  2. Michael Kraus
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Correspondence to Miriam Schuster.

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Schuster, M., Kraus, M., Schneider, J. et al. Investigations on the thermorheologically complex material behaviour of the laminated safety glass interlayer ethylene-vinyl-acetate. Glass Struct Eng 3, 373–388 (2018). https://doi.org/10.1007/s40940-018-0074-9

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