Experimental and Numerical Study of Viscoelastic Properties of Polymeric Interlayers Used for Laminated Glass: Determination of Material Parameters

An accurate material representation of polymeric interlayers in laminated glass panes has proved fundamental for a reliable prediction of their response in both static and dynamic loading regimes. This issue is addressed in the present contribution by examining the time-temperature sensitivity of th...

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Bibliographic Details
Published in:Materials 2019-07, Vol.12 (14), p.2241
Main Authors: Hána, Tomáš, Janda, Tomáš, Schmidt, Jaroslav, Zemanová, Alena, Šejnoha, Michal, Eliášová, Martina, Vokáč, Miroslav
Format: Article
Language:English
Subjects:
Dynamic loads
Energy
Ethylene vinyl acetates
Glass
Interlayers
Mathematical models
Mechanical properties
Parameter identification
Polymers
Polyvinyl acetal resins
Polyvinyl butyral
Safety glass
Shear stiffness
Shear tests
Temperature effects
Viscoelasticity
Viscosity
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Summary:An accurate material representation of polymeric interlayers in laminated glass panes has proved fundamental for a reliable prediction of their response in both static and dynamic loading regimes. This issue is addressed in the present contribution by examining the time-temperature sensitivity of the shear stiffness of two widely used interlayers made of polyvinyl butyral (TROSIFOL BG R20) and ethylene-vinyl acetate (EVALAM 80-120). To that end, an experimental program has been executed to compare the applicability of two experimental techniques, (i) dynamic torsional tests and (ii) dynamic single-lap shear tests, in providing data needed in a subsequent calibration of a suitable material model. Herein, attention is limited to the identification of material parameters of the generalized Maxwell chain model through the combination of linear regression and the Nelder-Mead method. The choice of the viscoelastic material model has also been supported experimentally. The resulting model parameters confirmed a strong material variability of both interlayers with temperature and time. While higher initial shear stiffness was observed for the polyvinyl butyral interlayer in general, the ethylene-vinyl acetate interlayer exhibited a less pronounced decay of stiffness over time and a stiffer response in long-term loading.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma12142241