Bulletin of the American Physical Society
22nd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 67, Number 8
Monday–Friday, July 11–15, 2022; Anaheim, California
Session F04: Multiphase EOS Experimental Measurements IIRecordings Available
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Chair: Christopher Johnson, Sandia National Laboratories Room: Anaheim Marriott Platinum 2 |
Monday, July 11, 2022 3:30PM - 3:45PM |
F04.00001: Heat of detonation of 2,4,6-triamino-1,3,5-trinitrobenzene (TATB) as a function explosive density Suzanne M Sheehe, Jennifer Montgomery, Lawrence E Fried, Octavio Cervantes The detonation product equation of state (EOS) describes the transfer of energy from detonation products to adjacent materials. Because most interest is on the expansion Pressure – Volume (P-V) work that the products does on the surroundings, the EOS is shown as P-V curve describing product expansion from the detonation state along a specified adiabat. Currently, the product EOS is measured experimentally using three tests that cover the volume expansion range of interest: (1) Disc Acceleration eXperiment (DAX), (2) the cylinder test, and (3) detonation calorimetry. These techniques directly probe small, moderate, and large volume expansions, respectively. Here, this work will present detonation calorimeter results for neat 2,4,6-triamino-1,3,5-trinitrobenzene (TATB) as a function of charge density. The explosives configuration (heavy confinement) is deliberate to enable interrogation of the C-J adiabat. Finally, the precision of the instrument will be discussed and how this impacts uncertainty in the EOS fits. |
Monday, July 11, 2022 3:45PM - 4:00PM |
F04.00002: Velocity-adjusted Davis products isentrope for program burn calculations Eduardo Lozano, Tariq D Aslam, David B Culp, Matthew A Price The disparity between the reaction and the engineering length scales in high-explosive (HE) systems motivates the use of program burn methods such as Detonation Shock Dynamics (DSD). DSD replaces the detonation wave with a surface and an evolution equation that precomputes the burn time field based on a curvature-dependent normal detonation velocity. When this velocity differs from the nominal Chapman–Jouguet value (non-zero curvature), the local expansion isentrope of the HE detonation products must be adjusted to yield the correct detonation energy and mathematically consistent post-flow state. We present the derivation of a velocity-adjusted model based on the Davis reference curve. The physical constraints result in a system of nonlinear equations for the free parameters of the equation of state that can be solved numerically. The velocity-adjusted model is evaluated using cylinder test calculations for PBX 9502 at different charge diameters. |
Monday, July 11, 2022 4:00PM - 4:15PM |
F04.00003: Equation of state of additively manufactured Ti-6Al-4V quasi-hydrostatically compressed and decompressed in a DAC to ~55 GPa Samantha Couper, Reeju Pokharel, Rick Rowland, Changyong Park, Jesse S Smith, Blake Sturtevant Ti-6Al-4V is widely used in industrial applications due in part to its suppression of the brittle, ω phase to high pressures. This has led to extensive previous studies on Ti-6Al-4V using a variety of static and shock compression platforms. However, advanced (e.g. additive) manufacturing techniques are well-known to affect macroscopic material properties, leading to intensive efforts to study these materials at the meso- and micro-scale to inform “process-structure- properties-performance” design of high performance parts. To determine effects of additive manufacturing processes at the crystal lattice scale, we quasi-hydrostatically compressed an additively manufactured sample of Ti-6Al-4V to ~55 GPa at 300K in a diamond anvil cell using KCl as a pressure-transmitting medium. Platinum was used as a primary internal pressure standard. We found that the transition from the low pressure α phase to the higher pressure ω phase began at roughly 42 GPa and the two phases coexisted until nearly 54 GPa. This phase boundary is >10 GPa higher than the same transition reported in recent studies of commercial Ti-6Al-4V. Upon decompression, the α phase begins to recover at ~23 GPa and both α and ω phases are present at ~0 GPa indicating that significant hysteresis exists in the sample.
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Monday, July 11, 2022 4:15PM - 4:30PM |
F04.00004: Absolute EOS of molybdenum and diamond from laser-accelerated flyer-plate impacts Federica Coppari, Amy E Lazicki, Peter M Celliers, Marius Millot, Rich London, David J Erskine, Dayne E Fratanduono, Jon H Eggert, Robert F Heeter The measurement of materials’ equations of state (EOS) is relevant to a variety of applications, ranging from material science to geophysics and planetary science. EOS measurements along a shocked state (Hugoniot) are particularly useful for developing and benchmarking models because they yield data from well-defined thermodynamic states. Impedance-matching (IM) techniques, which are most often used to determine the shock state at multi-megabar pressure, rely on the accurate knowledge of the impedance matching standard EOS and behavior upon release, which are respectively limited in pressure or difficult to measure. Here we present the concept and initial results of absolute (reference-free) equation of state measurements, using symmetric impact of laser-accelerated flyer-plates. Experiments on diamond and molybdenum at multi-megabar pressures were performed at the Omega Laser Facility (University of Rochester, NY). VISAR (Velocity Interferometer System for Any Reflector) measurements allowed us to monitor the flyer acceleration prior to impact and the shock state generated upon impact on the target, thus providing simultaneous measurement of the particle and shock velocity from which pressure and density can be obtained using the Rankine-Hugoniot relations, without the need to rely on a reference material. |
Monday, July 11, 2022 4:30PM - 4:45PM |
F04.00005: Evidence for the isotope effect on the liquid-liquid metal-insulator transition in dense fluid hydrogen Peter M Celliers, Marius Millot, Paul Loubeyre, Stephanie Brygoo, Ryan S McWilliams, Jon H Eggert, J. Ryan Rygg, Dayne E Fratanduono, Alexander Goncharov, Gilbert W Collins, Raymond Jeanloz, Russell J Hemley We report new results investigating the liquid-liquid metal-insulator transition in hydrogen. Previous investigations using dynamic compression techniques have focused on the deuterium isotope, while investigations with static techniques have examined both isotopes. We have fielded several dynamic compression experiments on the NIF with hydrogen and find clear evidence of an isotope effect in the pressure-temperature locus of the liquid-liquid metal-insulator transition. These results complement the recent static data and provide additional evidence to constrain theoretical models. LLNL-ABS-832655 |
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