Bulletin of the American Physical Society
16th APS Topical Conference on Shock Compression of Condensed Matter
Volume 54, Number 8
Sunday–Friday, June 28–July 3 2009; Nashville, Tennessee
Session K4: ED-2b: Isentropic Compression |
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Chair: Jacques Petit, Delegation Generale Armement Room: Hermitage D |
Tuesday, June 30, 2009 1:30PM - 2:00PM |
K4.00001: Quasi-isentropic compression of materials using the magnetic loading technique Invited Speaker: The Isentropic Compression Experiment (ICE) technique has proven to be a valuable complement to the well-established method of shock compression of condensed matter. The magnetic loading technique using pulsed power generators was first developed about a decade ago on the Z Accelerator, and has matured significantly. The recent development of small pulsed power generators have enabled several key issues in ICE, such as panel {\&} sample preparation, uniformity of loading, and edge effects to be studied. Veloce is a medium-voltage, high-current, compact pulsed power generator developed for cost effective isentropic experiments. The machine delivers up to 3 MA of current rapidly ($\sim $ 440-530 ns) into an inductive load where significant magnetic pressures are produced. Examples of recent material strength measurements from quasi-isentropic loading and unloading of materials will be presented. In particular, the influence that the strength of interferometer windows has on wave profile analyses and thus the inferred strength of materials is examined. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the U.S. Department of Energy's National Nuclear Security Administration under Contract No. DE-AC04-94AL85000. [Preview Abstract] |
Tuesday, June 30, 2009 2:00PM - 2:15PM |
K4.00002: Sample Preheating Capabilities for Shock and Isentropic Loading Experiments at the DICE Facility R.J. Hickman, M.D. Willis, J.L. Wise, J.L. Lynch, A.W. Shay, M.I. Kaufman A system for preheating test specimens prior to shock or isentropic loading was developed at Sandia's Dynamic Integrated Compression Experimental (DICE) Facility. A dual-output, proportional-integral-derivative (PID) controller using feedback from thermocouples regulated power supplied independently to one or two resistive heaters so as to achieve the desired temperature(s) at selected position(s) within the test assembly. Thermal isolation features validated by finite element heat-transfer analyses afforded temperature uniformity across samples mounted in electrode panels for the Veloce pulsed electromagnetic driver. The preheat system was demonstrated during Veloce experiments on samples (e.g., tin) preheated up to 200 C, and during gas-gun tests. Temperatures exceeding 600 C for Veloce tests are possible, pending identification and qualification of an appropriate high-temperature insulator for the gap between the electrode panels. [Preview Abstract] |
Tuesday, June 30, 2009 2:15PM - 2:30PM |
K4.00003: Design of a Sample Recovery Assembly for Magnetic Ramp-Wave Loading S. Chantrenne, J.L. Wise, J.R. Asay, M.E. Kipp, C.A. Hall Characterization of material behavior under dynamic loading requires studies at strain rates ranging from quasi-static to the limiting values of shock compression. For completeness, these studies involve complementary time-resolved data, which define the mechanical constitutive properties, and microstructural data, which reveal physical mechanisms underlying the observed mechanical response. Well-preserved specimens must be recovered for microstructural investigations. Magnetically generated ramp waves produce strain rates lower than those associated with shock waves, but recovery methods have been lacking for this type of loading. We adapted existing shock recovery techniques for application to magnetic ramp loading using 2-D and 3-D ALEGRA MHD code calculations to optimize the recovery design for mitigation of undesired late-time processing of the sample due to edge effects and secondary stress waves. To assess the validity of our simulations, measurements of sample deformation were compared to wavecode predictions. [Preview Abstract] |
Tuesday, June 30, 2009 2:30PM - 2:45PM |
K4.00004: Explosive loading liner-type devices for generation of loading pulses having short durations Andrey Malyshev, Viktor Skokov, Dmitriy Kryuchkov, Dmitriy Zotov To investigate the phenomena of short-time softening in metals under effect of planar shock waves having amplitudes of 35 and 16 GPa when loading duration is less then 1 ms, two series of explosive loading devices are developed. In these devices, impactors are accelerated in the regime of sliding detonation. Loading devices with thicknesses of copper impactors of 1.0, 0.5, and 0.2 mm are presented in each series. The characteristic size of the investigated samples can be up to 90 mm in diameter. The paper includes the basic characteristics of the devices and results of their verifications. [Preview Abstract] |
Tuesday, June 30, 2009 2:45PM - 3:00PM |
K4.00005: Shockless Compression Studies of HMX-Based and TATB-Based Explosives Melvin Baer, Seth Root, Dana Dattelbaum, Dan Hooks, Rick Gustavsen, Bruce Orler, Tim Pierce, Frank Garcia, Kevin Vandersall, Stan DeFisher, Brian Travers Several HMX-based and TATB-based explosive samples along with their constituent binders were subjected to shockless compression to determine the material response at high stresses. A Velocity Interferometer System for Any Reflector (VISAR) was used to measure the transmitted wave profiles. The measured wave profiles were compared to calculated profiles generated from backward and forward analysis procedures using optimization methods. These results were used to determine the constitutive and equation of state (EOS) properties of the explosives and binders. [Preview Abstract] |
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