A simple recovery technique for shock wave studies of brittle materials AIP Conf. Proc. 309, 1663 (1994); 10.1063/1.46146 This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation. Time dependent shock temperatures were measured for stainless steel (SS) films in contact with transparent anvils. The anvil/window material was the same as the driver material so that there would be symmetric heat flow from the sample.Inferred Hugoniot temperatures, Th, of 5800-7500K at 232-321GPa are consistent with previous measurements in SS. Temperatures at the fihn-anvil interface (T,), which are more directly measured than Th, indicate that Ti did not decrease measurably during the approximately 250ns that the shock wave was in A1203 or LiF anvils. Thus an upper bound is obtained for the thermal diffusivity of A1203 at the metal/anvil interface at 230GPa and 6000K of ~ < O.O0096cm2/s. This is a factor of 17 lower than previously calculated values, resulting in a decrease of the inferred :/'a by 730k. The observed shock temperatures are combined with temperatures calculated from measured ttugonlots and are used to calculate thermal conductivities of A1203. Also we note that since there was no measurable intensity decrease during the time when the shock wave propagated through the window, we infer from this that A1203 remained transparent while in the shocked state.Thus sapphire is a good window material to at least 250GPa for shock temperature measurements for metals.
Shock initiated light emission experiments were performed on Teflon shock loaded to pressures up to ~17 GPa. Radiances up to 600 x 106W 9 m-2/(ster 9 rim), were measured over a range of 390 to 820 nm. We have measured the spectra of light emitted upon reflection of the shock at the free surface and observed it to be distinctly non-thermal in nature. The light emission appears to result from bond destruction such as observed in shock recovery experiments on Teflon and in quasistatic experiments conducted on other polymers.
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