The mechanical behaviour of polyvinyl butyral at intermediate strain rates and different temperatures

Polyvinyl butyral (PVB) is often used in laminated glass and windscreen for its high ductility and good adhesion with glass. Previous studies have shown that the mechanical properties of PVB are both rate-dependent and temperature-dependent. To investigate mechanical properties of PVB material under different strain rates and different temperatures, a series of tensile tests on 1.52 mm-thick PVB specimens are carried out, covering designed engineering strain rates from 0.1/s to 300/s and temperatures from −30 °C to 40 °C, using an Instron high-speed servo-hydraulic testing machine and temperature box. Corresponding true stress-true strain curves are obtained. The testing results are then analyzed and empirical formulae are derived for key mechanical property parameters. Finally, based on G'Sell model, dynamic constitutive equations are given at different temperatures for PVB.