Some New Developments in Shock Wave Research

Chhabildas, L.C.

doi:10.1016/b978-0-08-024774-8.50233-4

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…With the proper selection or design of materials for the impactor, ramp waves can be generated in a plate impact experiment. The materials that have been used for the impactor in plate impact ramp wave experiments include fused silica (Barker and Hollenbach, 1970), ceramics (Asay and Chhabildas, 1980), material with graded density (Barker, 1983), and layered material (Chhabildas and Barker, 1987). More recently, a significant development in the ramp wave experiment has been made at Sandia National Laboratories.…”

Section: Equation Of State (Eos)mentioning

confidence: 98%

Thermal and mechanical analysis of material response to non-steady ramp and steady shock wave loading

Ding

2006

Journal of the Mechanics and Physics of Solids

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Section: Equation Of State (Eos)mentioning

confidence: 98%

Thermal and mechanical analysis of material response to non-steady ramp and steady shock wave loading

Ding

2006

Journal of the Mechanics and Physics of Solids

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“…However, isentropic compression data have been hard to achieve. Some experiments have been done using graded impactors [1] but are limited to <2. 5 Mbar pressure and are quasi-isentropic, in that they consist of a series of small shocks rather than a smooth ramp loading.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the principal isentropes of lead and lead–antimony alloy to ∼400 kbar by quasi-isentropic compression

Rothman

Davis

Maw

et al. 2005

J. Phys. D: Appl. Phys.

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The magnetic-pressure drive technique allows single-shot measurements of compression isentropes. We have used this method to measure the isentropes in the pressure–volume space of bulk and single-crystal lead, and lead–antimony alloy to ∼400 kbar.The isentrope pressure–volume curves were found from integration of the experimentally deduced Lagrangian sound speed as a function of particle velocity. A characteristics calculation method was used to convert time-resolved free-surface velocity measurements to corresponding in situ particle-velocity histories, from which the Lagrangian sound speed was determined from the times for samples of different thicknesses to reach the same particle velocity. Use of multiple velocity interferometry probes decreased the uncertainty due to random errors by allowing multiple measurements.Our results have errors of from 4% to 6% in pressure, ∼1% to 1.5% in volume, depending on the number of measurements, and are consistent with existing isotherm and Hugoniot data and models for lead.

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“…Unfortunately, such materials (typically ceramics) tend to have high elastic limits that adversely perturb the unsteady stress wave entering the molten tin. Early experiments attempted to use Pyroceram ® 9608 glass ceramic which had previously been shown to exhibit anomalous compression (spreading instead of steepening a propagating wave) up to 20 GPa [Asay and Chhabildas, 1980]. Impact experiments carried out on three different batches of the material, however, showed this behavior to be very sensitive to microstructure, which itself is sensitive to small differences in ceramic processing.…”

Section: Thermal Insulationmentioning

confidence: 99%

Experimental and computational study of the liquid-solid transition in tin.

Foiles¹,

Davis²

2005

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An experimental technique was developed to perform isentropic compression of heated liquid tin samples at the Z Accelerator, and multiple such experiments were performed to investigate solidification under rapid compression. Preliminary analyses, using two different methods, of data from experiments with high uncertainty in sample thickness suggest that solidification can begin to occur during isentropic compression on time scales of less than 100 ns. Repeatability of this result has not been confirmed due to technical issues on the subsequent experiments performed. First-principles molecular-dynamics calculations based on density-functional theory showed good agreement with experimentally-determined structure factors for liquid tin, and were used to investigate the equation of state and develop a novel interatomic pseudo-potential for liquid tin and its high-pressure solid phase. Empirical-potential molecular-dynamics calculations, using the new potential, gave results for the solid-liquid interface velocity, which was found to vary linearly with difference in free energy between the solid and liquid phases, as well as the liquidus, the maximum over-pressurization, and the solid-liquid interfacial energy. These data will prove useful in future modeling of solidification kinetics for liquid tin. Stephen Foiles would like to acknowledge many useful discussions with J. J. Hoyt (Org. 1814) concerning the simulation of solid-liquid interfaces. Aidan Thompson (Org. 1435) incorporated the new interatomic potential into the parallel molecular dynamics code, GRASP. Finally, Marcus Martin (Org. 1435) provided important advice on the use of the DAKOTA software package for the determination of interatomic potentials.

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Some New Developments in Shock Wave Research

Cited by 5 publications

References 6 publications

Thermal and mechanical analysis of material response to non-steady ramp and steady shock wave loading

Thermal and mechanical analysis of material response to non-steady ramp and steady shock wave loading

Measurement of the principal isentropes of lead and lead–antimony alloy to ∼400 kbar by quasi-isentropic compression

Experimental and computational study of the liquid-solid transition in tin.

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