Bulletin of the American Physical Society
2005 14th APS Topical Conference on Shock Compression of Condensed Matter
Sunday–Friday, July 31–August 5 2005; Baltimore, MD
Session E6: Equation of State II |
Hide Abstracts |
Chair: Ann Mattsson, Sandia National Laboratories Room: Hyatt Regency Chesapeake A/B |
Monday, August 1, 2005 3:30PM - 3:45PM |
E6.00001: Post Shock Temperature Measurements in Metals and Rocks Achim Seifter, Sarah Stewart, Furlanetto Michael, Gregory Kennedy, Jeremy Payton, Andrew Obst Abstract: Post-shock temperature is an important quantity in shock physics experiments for constraining the dynamic equations-of-state of materials. A high-speed infrared multiwavelength pyrometer has been developed at the Los Alamos National Laboratory for operating in the temperature range from 400 to 1200 K. With customized front end optics, permitting concurrent VISAR experiments in the same optical path, it is being used at the new gas gun in the Department of Earth and Planetary Sciences at Harvard University. This paper describes the experimental setup and results obtained to date on molybdenum, aluminum and basalt. [Preview Abstract] |
Monday, August 1, 2005 3:45PM - 4:00PM |
E6.00002: Measurement of the Orientation Dependence of the Principle Shock Hugoniot in Copper Palakkal Asoka-kumar, James Stolken, Ricky Chau, Neil Holmes, Mukul Kumar Recent advances in multi-scale modeling suggest that the influence of material microstructure on the shock response of polycrystalline metals may be significant. Numerous large-scale molecular dynamics (MD) simulations, using a variety of different inter-atomic potentials, have consistently predicted a strong orientation dependence for the shock response of metallic single crystals. The slopes of the predicted shock velocity vs particle velocity curves vary nearly 50{\%} as a function of orientation with simulated shock pressures in the 100 -- 500 kbar regime. To the best of our knowledge a detailed study of this orientation dependence has not been performed and therefore no complementary experimental data exists to compare with the results of the aforementioned MD simulations. In order to address this issue, the principle shock hugoniot has been measured for three orientations ([100], [110], and [111]) of very high purity copper single crystals over a pressure range of 100 to 400 kbar. The implications on the crystallographic texture dependence of equations-of-state for polycrystalline metals are explored and the application of these results to the analysis of single crystal spall experiments shall also be discussed. This work was performed under the auspices of the U. S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48. [Preview Abstract] |
Monday, August 1, 2005 4:00PM - 4:15PM |
E6.00003: Equation of state of diamond under shock compression up to 2 TPa Hirofumi Nagao, Ken-ichi Kondo, Norimasa Ozaki, Takatoshi Ono, Kikuo Takamatsu, Keiji Nagai, Mitsuo Nakai, Kazuo A. Tanaka, Kunihiko Wakabayashi, Ken Okada, Masatake Yoshida The equation of state of diamond was studied using laser-driven shock waves in the terapascal region between 0.5 and 2 TPa. Strong single shock waves were generated by direct-irradiation of laser beams from the GEKKO/HIPER glass laser system of the ILE. The shocked targets consisted of a 20 um-thick single crystalline diamond and a 20 um-thick aluminum foil, both of which were on a 50 um-thick aluminum base plate. The shock wave velocity was measured directly by observation of the self-emission or change of reflectivity. Using the impedance-matching method, the pressures and particle velocities of diamond were obtained. [Preview Abstract] |
Monday, August 1, 2005 4:15PM - 4:30PM |
E6.00004: Shock wave response of a Zr-based bulk metallic glass and its composite Yabei Gu, Guruswami Ravichandran A series of plane wave impact experiments were carried out at peak impact stress up to 6 GPa on Zr-based Bulk metallic glass Zr$_{41.2}$Ti$_{13.8}$Cu$_{12.5}$Ni$_{10}$Be$_{22.5}$ (Vit1) and its composite Zr$_{56.3}$Ti$_{13.8}$Cu$_{6.9}$Ni$_{5.6}$Nb$_{5.0}$Be$_{12.5}$ ($\beta $ Vit1). The experiment set up was designed to obtain the stress history signal and VISAR data simultaneously, so that three different methods which include impedance matching method, stress signal data deduction and VISAR signal data deduction could be applied to obtain the particle velocity information. Linear shock speed -- particle velocity relation, standard two wave elastic-plastic shock front structure with reasonable HEL behavior were obtained from collected data. A sudden drop of shock velocity happens in the $D-u$ Hugoniot relation which indicates a strong and sudden internal failure. Before the appearance of such drop of shock speed, standard two-wave shock front structure and negative strain rate sensitivity behavior are exhibited clearly in obtained VISAR signals. The non-plane shock wave generated due to this local wave scattering and interactions from the internal failure are believed to lead such shock speed drop and in turn lead to lower frequency response of VISAR signal. A descriptive three stage failure model was proposed. [Preview Abstract] |
Monday, August 1, 2005 4:30PM - 4:45PM |
E6.00005: The Shock Hugoniot of the Intermetallic Compound, Ni3Al I. Knapp, J.C.F. Millett, G.T. Gray, N.K. Bourne Interest in the shock-induced mechanical response of the intermetallic material, Ni3Al lies in two areas. The first is in blade containment in the failure of jet turbine engines. As Ni3Al is the main strengthening phase in nickel based superalloys, the behaviour of these materials under impact conditions is of great importance. Secondly, from a more fundamental point of view, Ni3Al, with the ordered face centred cubic L12 structure, will possess a different response to shock loading to a simpler face centred cubic counterpart such as nickel. In this paper, we thus examine the shock-induced behaviour of Ni3Al, and compare it to the known response of pure nickel. [Preview Abstract] |
Monday, August 1, 2005 4:45PM - 5:00PM |
E6.00006: Low Pressure Hugoniot for U-Nb (6 wt.{\%}) D.D. Koller, P.A. Rigg, R.S. Hixson, G.T. Gray III, B.J. Jensen, J.D. Maestas Over the last several years, many experiments have been conducted to study the dynamic response of U-Nb (6 wt.{\%}) alloy. An understanding of the physical mechanisms governing the behavior of this material is necessary to develop robust physical models for today's hydrocodes. Previous experiments indicate that the dynamic response of this alloy is strongly dependent on the initial microstructure of the material. Using a well characterized material, a series of low pressure shock experiments were conducted at the single stage light gas gun facility at Los Alamos National Laboratory. Time resolved particle velocity measurements were made using VISAR. Absolute VISAR system timing was measured and cross correlated to shock breakout time to allow hugoniot points to be calculated. These shots provide both low pressure Hugoniot points for U-Nb (6 wt.{\%}) alloy and a better constraint on the dynamic material response behavior under low pressure shock loading. [Preview Abstract] |
Monday, August 1, 2005 5:00PM - 5:15PM |
E6.00007: Quasi-Isentropic and Shock Compression Measurements of Iron Response by Direct Laser Illumination Thomas E. Tierney, IV, Damian C. Swift, Sheng-Nian Luo, Jonathan Niemczura We performed a series of dynamic loading experiments on iron with pressures of 50-400 GPa at the Trident Laser Laboratory. We used 2.4 ns laser pulses of varying shapes and irradiances, 2 to 1000 GW/cm$^2$ to load a 5-mm diameter region of rolled iron foils that were 25-50 microns thick. The temporal characteristic of the laser irradiance was tailored to produce shock or quasi-isentropic loading histories. Line-imaging VISAR was used to time-resolve free surface velocities. In most experiments, two different thickness samples, placed side-by-side, were subjected to the same irradiance history. We describe the experiment configuration, analysis, and results. [Preview Abstract] |
Monday, August 1, 2005 5:15PM - 5:30PM |
E6.00008: Investigation of Near Critical Point States of Molybdenum by Pulse Heating under Launching Dmitriy Nikolaev, Andrey Emelyanov, Vladimir Ternovoi, Alexey Pyalling, Vladimir Fortov The near critical point states (NCPS) of the liquid-vapour phase transition of molybdenum were investigated. The heating of molybdenum foil samples in 1-D geometry was carried out by multiple-shocked He from the back side of the sample under dynamically created isobaric conditions [1]. The temperature of sample was measured by fast 4-channel optical pyrometer. The pressure was obtained from shock velosity in He, measured by streak camera on the step on transparent window. Two sets of experiments with various hystory of heating were carryed out, allowed us to evaluate spinode and binode lines, and the position of critical point on $P-T$ plane: $T_c=12500\pm 1000$~K, $P_c=1\pm 0.1$~GPa. Work was supported by ISTC grant 2107, RFBR grant 04-02-16790. \newline \newline [1] V.Ya.Ternovoi, V.E.Fortov et.al. High Temp.-High Pres. 2002, v.34, pp.73-79\newline [2] D.N.Nikolaev, A.N.Emelyanov et.al. in: SCCM-2003, AIP conf. proc. 706, ed.by M.D.Furnish, Y.M.Gupta et.al, pp.1231-1234 [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700