Abstract
The shock wave response of commercial poly(methyl methacrylate), PMMA, in the vicinity of its glass transition temperature (Tg = 110–120 °C) was studied in two series of impact experiments, the first of which was aimed at the variation of the PMMA spall strength with temperature. The purpose of the second series was the effect of temperature on the PMMA Hugoniot. It was found that the spall strength of PMMA experiences an abrupt twofold drop at ≈120 °C. The PMMA Hugoniot Us=C0+sup was found to be that of a virtually elastic solid with C0 close to the longitudinal speed of sound, cl, at room temperature and transformed above Tg into a viscous material with no shear strength and C0 close to the bulk speed of sound, cb.
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