Dynamic response of molybdenum shock compressed at 1400°C
Wave profile measurements are reported for pure molybdenum initially heated to 1400 °C and shock compressed to stresses between 12 and 81 GPa. The Hugoniot states are consistent with previous results and all data can be described by the parameters: c_0=4.78(2) km/s and s=1.42(2), where the numbers in parentheses are one standard deviation uncertainties in the last digits. The amplitude of the Hugoniot elastic limit is 1.5–1.7 GPa at 1400 °C compared with 25 °C values of 2.3–2.8 GPa. Unloading wave velocities range from 6.30(22) km/s at 12.0 GPa to 7.91(24) km/s at 80.7 GPa and are 4%–8% below extrapolated ultrasonic values and Hugoniot measurements from a room temperature initial state. These differences can be explained by the effect of temperature on the compressional elastic wave velocity. No temperature dependence of the dynamic tensile strength can be resolved from the present data.
© 1994 American Institute of Physics. Received 23 December 1993; accepted for publication 24 March 1994. We thank L. Rowan, E. Gelle, M. Long, and A. DeVora for experimental assistance and O. B. Crump and L. Barker of Sandia National Labs for technical advice. M. Furnish of Sandia provided us with copies of his data. This research was supported by the NSF. Contribution 5348, Division of Geological and Planetary Sciences, California Institute of Technology.
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