Laminated Glass for Blast Mitigation : Role of Interlayer Properties

We present measurements of polymer interlayer tensile properties under high deformation rates associated with blast loading of laminated glass. For both PVB (Butacite®) and SentryGlas® Plus interlayers, tensile properties at high deformation rates are significantly different from behavior at low rates. The most significant differences are for PVB where the polymer behavior changes from hyperelastic, at low rates, to elasto-plastic, with much increased initial stiffness at high rates. An example of how high rate polymer properties may be used in finite elements to simulate the blast response of a minimally supported laminate is described.