Adhesion rupture in laminated glass: influence of adhesion on the energy dissipation mechanisms
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SI: Challenging Glass
Adhesion rupture in laminated glass: influence of adhesion on the energy dissipation mechanisms Paul Fourton . Keyvan Piroird . Matteo Ciccotti . Etienne Barthel
Received: 10 February 2020 / Accepted: 26 August 2020 Springer Nature Switzerland AG 2020
Abstract When laminated glass shatters under impact, most of the energy dissipation occurs in the coupled delamination and stretching of the polymer interlayer between broken chunks of glass. The strong dependency of these mechanisms on interlayer nature, on loading rate and on temperature has been previously investigated: however, the effect of the interfacial adhesion is unexplored. In this work, a surface modification technique is proposed, along with a mechanical characterization of the debonding with the Through Crack Tensile Test. We show that while increasing adhesion has the effect of enhancing the energy required to propagate the delamination fronts as well as the stretch level of the delaminated interlayer, the dissipation associated to the stretching of the volume of the PVB interlayer seems unaffected. We attribute this effect to the competition between the changes in both stretch and stretch rate in the viscoelastic interlayer. Finally, we discuss the experimental observation of the limits of the steady-state debonding regime, related to the competition between
P. Fourton K. Piroird (&) Saint-Gobain Research Paris, 39 quai Lucien Lefranc, 93303 Aubervilliers Cedex, France e-mail: [email protected] M. Ciccotti E. Barthel Sciences et Inge´nierie de la Matie`re Molle, ESPCI Paris, PSL University, CNRS, Sorbonne Universite´, 75005 Paris, France
adhesive crack propagation and cohesive failure in the interlayer. Keywords Laminated glass PVB Adhesion Through Crack Tensile test
1 Introduction The present work focuses on the debonding of a soft polymer material from a glass substrate upon large deformation of the polymer. This subject is related to the impact resistance of laminated glass, an industrial product made of a polymer foil—the interlayer— sandwiched between two glass plies. Previous work on impact resistance of laminated glass showed that for an impacting object of a few kilograms falling on a laminated glass at velocity typically between 1 and 10 m/s, the majority of the kinetic energy is converted into delamination and stretching of the interlayer (Nourry 2005; Elzie`re et al. 2017). The key role of the interlayer appears even more clearly in the experimental results of Novotny and Poot (2016). They investigated the effect of temperature on impact performance for 5 different interlayers with the mean break height (MBH) method, a quantitative variation around the ‘‘ball drop’’ test. The MBH procedure consists in dropping a 2-kg steel ball on 30cm 30cm glass panes from a variable height. The drop height is increased when the laminate
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retains the steel ball (‘‘OK’’ case), and decreased when the impactor perforates through the g
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