Bulletin of the American Physical Society
20th Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 62, Number 9
Sunday–Friday, July 9–14, 2017; St. Louis, Missouri
Session F8: Experimental Developments II: Hugoniot and Temperature Measurements |
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Chair: Laura Robin Benedetti, Lawrence Livermore National Laboratory Room: Grand Ballroom C |
Monday, July 10, 2017 5:00PM - 5:15PM |
F8.00001: Measurement of Fe Temperature under Dynamic Compression Minta Akin, Ricky Chau We report on progress toward measuring the temperature of Fe at ~2 Mbar, near the melting point on the Hugoniot, as part of an effort to obtain a complete equation of state for Fe. Fe was directly coated on a LiF tamping window and shock compressed using a two stage light gas gun. Radiance and reflectance were simultaneously measured from ~350-750 nm using four streak spectrometers. Comparison of reflected and emitted light allows us to calculate emissivity as a function of wavelength to correct graybody emission to determine T, predicted to be around 5000K, and compare measured reflectance with band structure calculations. [Preview Abstract] |
Monday, July 10, 2017 5:15PM - 5:30PM |
F8.00002: IR Temperature Measurement in Pressure-Shear Plate Impact Tong Jiao, Pinkesh Malhotra, Rodney Clifton Pressure-Shear Plate Impact (PSPI) experiments on samples sandwiched between two hard plates have been developed previously for measuring the shearing resistance of materials at high strain rates, large inelastic shear strains, and high pressures.~ To enhance the value of such experiments in developing constitutive models for the dynamic response of materials, concurrent temperature measurements are being pursued by monitoring the infrared radiation emitted from the sample/rear-plate interface. The emitted radiation is collected by fast HgCdTe detectors through a pair of 90$^{\mathrm{o}}$ off-axis parabolic reflectors. ZnSe is used as the rear plate (\textit{window}) because its transmission band (0.6 $\mu $m -16 $\mu $m) covers an exceptionally wide range of wavelengths --- extending beyond the cutoff wavelength of the IR detector . Moreover, ZnSe remains nominally linear-elastic up to a pressure of 12 GPa --- encompassing the pressure range for most PSPI experiments. Because temperatures generated in PSPI experiments are modest, the emissivity of the interface is increased by applying a thin layer of SiC at the sample/window interface. The high shearing resistance of SiC ensures that the allowable range of shear stresses is not limited by the presence of the high-emissivity layer. Pilot experiments will be assessed for their potential and limitations. [Preview Abstract] |
Monday, July 10, 2017 5:30PM - 5:45PM |
F8.00003: Measurement technique of high-temperature Hugoniont data of metals Tatsuhiro Katsuyama, Masayuki Takeda, Xun Liu, Akira Yoshiasa, Tsutomu Mashimo Equations of state of solids have been derived by using the assumed Gruneisen parameters from the Hugoniot data. If the Hugoniot data of the heated sample are measured, the Gruneisen parameter can be directly discussed by using Gruneisen type equation of state. We have measured the Hugoniot data of W, Cu, Au , etc. by using the high-time resolution streak camera system equipped with a powder gun and two-stage light gas gun. In this study, the measurement technique of the Hugoniot data of high-temperature sample using high-frequency heating apparatus was established equipped with a powder gun. We succeeded in the measurement of the Hugoniot data (shock-velocity and particle-velocity) of the high-temperature sample at 500-800 degrees C on some metals. The detailed results and discussion of Gruneisen parameter will be presented. [Preview Abstract] |
Monday, July 10, 2017 5:45PM - 6:00PM |
F8.00004: Developing a novel technique for absolute measurements of the principal- and second-shock Hugoniots:a benchmark for the impedance-match methods Yunjun Gu, Jun Zheng, Qifeng Chen, Chengjun Li, Jiangtao Li, Zhiyun Chen A novel diagnostics configuration was presented for performing the absolute measurements of the principal- and second-shock Hugoniots of the dense gaseous H2+D2 mixtures under multi-shock compression and probing their thermodynamic properties by a joint diagnostics of multi-channel optical pyrometer (MCOP), Doppler Pin System (DPS), and streak camera. This technique allowed the time-resolved optical radiation histories, interface velocity profiles, and time-resolved spectrum of the multi-compressed sample to be simultaneously measured in a single shot. The shock wave velocities and particle velocities under the former two shock compressions can be directly determined with the help of the above multiple detects instead of the impedance-match methods. So, absolute measurements of the principal- and second-shock Hugoniots for pre-compressed dense gaseous H2+D2 mixtures under multi-shock compression can be achieved, which provides a benchmark for the impedance-match measurement technique. Furthermore, the combination of multiple diagnostics also allows different experimental observables to be cross-checked, which reinforces the reliability of the experimental measurements. [Preview Abstract] |
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