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Experimental Characterization and Finite Element Modelling of Strain-rate Dependent Hyperelastic Properties of PVB Interlayers

Joren Pelfrene (UGent) , Sam Van Dam (UGent) , Siebe Spronk (UGent) and Wim Van Paepegem (UGent)
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Abstract
Laminated glass provides safety in an impact or explosion event by way of a polymer interlayer to which glass fragments adhere upon fracture. The mechanical deformation of the interlayer defines how the impact energy can be absorbed to prevent calamities by flying glass debris, penetration of a blast wave, lacerations, etc. The PVB interlayer used in safety glass shows highly nonlinear viscoelastic material behaviour, with a great sensitivity to temperature and deformation rate. Although various material models for PVB can be found in literature, few publications discuss the full range of its mechanical behaviour and none are found to describe a material model that is valid in a wide range of deformation rates and up to high elongations. Such material model is necessary for the numerical study of the post-fracture response in a dynamic event. The article describes the mechanical behaviour of PVB interlayer and the constitutive models by which the polymer can be represented under different load cases. Tensile experiments of Saflex® PVB are presented for a wide range of deformation rates and up to tearing of the specimens. Subsequently, a method to calibrate a hyper-viscoelastic material model for the interlayer by numerically simulating the tensile tests is developed. The resulting material models are valid up to the tearing strain of the interlayer and are accurate within a specified range of deformation rates and temperatures.
Keywords
Laminated Glass, PVB Interlayer, Material Model

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Chicago
Pelfrene, Joren, Sam Van Dam, Siebe Spronk, and Wim Van Paepegem. 2018. “Experimental Characterization and Finite Element Modelling of Strain-rate Dependent Hyperelastic Properties of PVB Interlayers.” In Challenging Glass Conference 6 Proceedings, ed. Christian Louter, Freek Bos, and Jan Belis, 435–446. Delft, Netherlands: TU Delft Open.
APA
Pelfrene, J., Van Dam, S., Spronk, S., & Van Paepegem, W. (2018). Experimental Characterization and Finite Element Modelling of Strain-rate Dependent Hyperelastic Properties of PVB Interlayers. In C. Louter, F. Bos, & J. Belis (Eds.), Challenging Glass Conference 6 Proceedings (pp. 435–446). Presented at the Challenging Glass Conference 6 , Delft, Netherlands: TU Delft Open.
Vancouver
1.
Pelfrene J, Van Dam S, Spronk S, Van Paepegem W. Experimental Characterization and Finite Element Modelling of Strain-rate Dependent Hyperelastic Properties of PVB Interlayers. In: Louter C, Bos F, Belis J, editors. Challenging Glass Conference 6 Proceedings. Delft, Netherlands: TU Delft Open; 2018. p. 435–46.
MLA
Pelfrene, Joren, Sam Van Dam, Siebe Spronk, et al. “Experimental Characterization and Finite Element Modelling of Strain-rate Dependent Hyperelastic Properties of PVB Interlayers.” Challenging Glass Conference 6 Proceedings. Ed. Christian Louter, Freek Bos, & Jan Belis. Delft, Netherlands: TU Delft Open, 2018. 435–446. Print.
@inproceedings{8569079,
  abstract     = {Laminated glass provides safety in an impact or explosion event by way of a polymer interlayer to which glass fragments adhere upon fracture. The mechanical deformation of the interlayer defines how the impact energy can be absorbed to prevent calamities by flying glass debris, penetration of a blast wave, lacerations, etc. The PVB interlayer used in safety glass  shows  highly  nonlinear  viscoelastic  material  behaviour, with a great sensitivity to temperature and deformation rate. Although various material models for PVB can be found in literature, few publications discuss the full range of its mechanical behaviour and none are found to describe a material model that is valid in a wide range of deformation rates and up to high elongations. Such material model is necessary for the numerical study of the post-fracture response in a dynamic event. The article describes the mechanical behaviour of PVB interlayer and the constitutive models by which the polymer can be represented under different load cases. Tensile experiments of Saflex{\textregistered} PVB are presented for a wide range of deformation rates and up to tearing of the specimens. Subsequently, a method to calibrate a hyper-viscoelastic material model for the interlayer by numerically simulating the tensile tests is developed. The resulting material models are  valid  up  to  the  tearing  strain  of  the  interlayer  and  are  accurate  within  a  specified  range  of  deformation  rates  and  temperatures.},
  author       = {Pelfrene, Joren and Van Dam, Sam and Spronk, Siebe and Van Paepegem, Wim},
  booktitle    = {Challenging Glass Conference 6 Proceedings},
  editor       = {Louter, Christian and Bos, Freek and Belis, Jan},
  isbn         = {978-94-6366-044-0},
  keyword      = {Laminated Glass,PVB Interlayer,Material Model},
  language     = {eng},
  location     = {Delft, Netherlands},
  pages        = {435--446},
  publisher    = {TU Delft Open},
  title        = {Experimental Characterization and Finite Element Modelling of Strain-rate Dependent Hyperelastic Properties of PVB Interlayers},
  url          = {http://dx.doi.org/10.7480/CGC.6},
  year         = {2018},
}

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