Static and high strain rate behavior of aged virgin PVB.

In this paper, the static and dynamic constitutive behavior of aged and unaged virgin PVB were evaluated at different strain rates using static and impact drop-weight testing. The aged virgin PVB was subjected to random environmental conditions of different temperature and moisture levels. All static tests were performed at room temperature ranging between 21 and 32 °C. The results showed that the aged and unaged virgin PVB dynamic constitutive response consists of two linear parts. The first part is linearly elastic and independent of the rate of loading. However, the second linear part was found to be dependent on the strain rate. Aging significantly affected both the static and dynamic constitutive stress-strain relations. Comparing aged and unaged high-strain rate results showed that aging significantly affects the material response of the interlayer materials used in laminated glass, and subsequently, their dynamic response under blast loads. For the aged material tested in this paper, the strain rate effect was found to be less significant in the current test temperature range. [ABSTRACT FROM AUTHOR]