Abstract
The dynamic stress-strain relation of poly(methyl methacrylate) (PMMA) under low dynamic loading has been measured up to a stress of about 1.5 GPa. Shock compression of specimens is performed by an one-dimensional impact experiment using an aluminium flyer plate accelerated by a light gas gun. The impact velocities u g , shock velocities U s , and peak pressure p of the shock waves are determined. From the U s − p and the U s − u p relations obtained ( u p is the velocity of particles in medium) an abrupt change of slope was found in the region u g=108m/s( U s=3020m/s, p=0.385GPa). The Hugoniot elastic limit (HEL) is therefore deduced to be 0.385±0.05GPa; that is only half the value which has been stated previously. The results demonstrate that in spite of the existence of a HEL an elastic precursor cannot be expected.
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