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 H6: Focus Session: Realizing the Promise of ICE I |
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Chair: Jeffrey Nguyen, Lawrence Livermore National Laboratory Room: Hyatt Regency Chesapeake A/B |
Tuesday, August 2, 2005 9:00AM - 9:15AM |
H6.00001: Isentropic Compression Data on Lx-04 Explosive at 150\r{ }C Using the Z Accelerator David E. Hare, Kevin S. Vandersall, Frank Garcia, Jean-Paul Davis, Clint Hall, Jerry W. Forbes Isentropic compression data was collected on LX-04 explosive (85{\%} HMX and 15{\%} Viton by weight) at 150\r{ }C using the Sandia National Laboratories Z accelerator facility. A ramp compression wave was applied to the explosive samples mounted on aluminum panels with VISAR interferometry measuring the sample and backing window interface velocity. Heating was obtained by wrapping band heaters around a thermal mass attached to each panel and temperatures were recorded by thermocouples at several locations on the panel. This work will outline the methods used, discuss the VISAR interface velocities, and present the preliminary isentrope data obtained on heated LX-04. These results demonstrate the ability to perform experiments on preheated samples to obtain isentrope data. 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] |
Tuesday, August 2, 2005 9:15AM - 9:30AM |
H6.00002: A Study of Binder Materials Subjected to Isentropic Compression Loading Clint Hall, Mel Baer, Rick Gustavsen, Daniel E. Hooks, E. Bruce Orler, Steve Sheffield, Gerrit Sutherland Binders such as Estane, Teflon, Kel F and HTPB are typically used in heterogeneous explosives to bond polycrystalline constituents together as an energetic composite. Combined theoretical and experimental studies are underway to unravel the mechanical response of these materials when subjected to isentropic compression loading. Key to this effort is the determination of appropriate constitutive and EOS property data at extremely high stress-strain states as required for detailed mesoscale modeling. The Sandia Z accelerator and associated diagnostics provides new insights into mechanical response of these nonreactive constituents via isentropic ramp-wave compression loading. Several thicknesses of samples, varied from 0.3 to 1.2 mm, were subjected to a ramp load of $\sim $42 Kbar over 500 ns duration using the Sandia Z-machine. Profiles of transmitted ramp waves were measured at window interfaces using conventional VISAR. Shock physics analysis is then used to determine the nonlinear material response of the binder materials. In this presentation we discuss experimental and modeling details of the ramp wave loading ICE experiments designed specifically for binder materials. [Preview Abstract] |
Tuesday, August 2, 2005 9:30AM - 9:45AM |
H6.00003: Jump Conditions for Nonsteady Waves William Anderson The common forms of the Rankine-Hugoniot jump conditions apply only to steady waves, $i.e$., those that equate mass flux into and out of the wave. However, many waves encountered in practice violate this condition, in that different characteristics of a wave may have different slopes. Consideration of the fundamental requirements of conservation of mass, momentum and energy in the absence of mass flux conservation allows derivation of expressions equivalent to the Rankine-Hugoniot relations, but without the requirement for conservation of mass flux. The primary difference is that knowledge of the wave profile at two different points is required, so that the characteristic slopes can be determined. In the case of a steady wave, the derived expressions reduce to the usual forms for the jump conditions. [Preview Abstract] |
Tuesday, August 2, 2005 9:45AM - 10:00AM |
H6.00004: Laser driven quasi-isentropic compression experiments (ICE) for extracting EOS and phase transition information Raymond Smith, Jave Kane, Jon Eggert, Stephen Moon, Michael Saculla, Walter Unites, Alan Jankowski, Thomas Lorenz, James Asay, Yogi Gupta, Gilbert Collins, Peter Celliers, John Edwards We demonstrate the recently developed technique of laser driven isentropic compression experiments (ICE) for extracting equation-of-state (EOS) information close to the Al isentrope up to a peak stress of 120GPa. We implement indirect drive techniques to achieve excellent planarity greater than the line visars 600$\mu $m field of view which allows use to use multiple steps. In addition the Laser driven ICE technique is been used to study phase changes in materials at higher strain rates than has been previously been possible using other drivers. We present data from experiments with shockless loading of Bi, Fe and Ce. The experimental work was performed on the Janus and Omega laser facilities. [Preview Abstract] |
Tuesday, August 2, 2005 10:00AM - 10:30AM |
H6.00005: Isentropic Compression Equation of State Analysis Invited Speaker: Dynamic off-Hugoniot measurements (re-shock, multi-shock, ring-up, quasi-isentropic) have long interested high-pressure scientists. Recent advances in ramp-wave loading using magnetic, laser, and graded-density impactor drives have inspired new interest in determining absolute, quasi-isentropic, equation-of-state (EOS) information from dynamic experiments into the multi-Mbar regime. These new experiments promise the potential to obtain an absolute EOS at many pressures along a quasi-isentrope in a single experiment. Such an experiment requires stringent experimental design including, a) highly accurate free surface or interface velocities measured for two or more sample thicknesses, b) extremely accurate relative timing of the velocity measurements, c) sufficiently planar drive that more than one sample thickness is driven by a single pressure drive, and d) the ramp drive must not generate a shock within the thickest sample step. The primary challenges to analyzing such experiments include, wave interactions, strength, phase transitions, and time-dependent (non-simple wave) effects. An ideal analysis should, a) give $P(\rho)$ independent of any a priori assumed parameterization, b) directly relate uncertainties in $P(\rho)$ to experimental uncertainties, and c) evaluate and address kinetic material effects that cause deviations from self-similar wave propagation. With these criteria in mind I will review several approaches to analyzing these quasi-isentropic compression experiments. [Preview Abstract] |
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