Journal ArticleDOI
Analysis of Lagrangian gauge measurements of simple and nonsimple plane waves
John B. Aidun,Yogendra M. Gupta +1 more
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In this paper, the analysis of multiple, embedded gauge measurements of large-amplitude plane waves is addressed and the use of wave similarity as a criterion for determining the preferred analytic approach is emphasized.Abstract:
Analysis of multiple, embedded gauge measurements of large‐amplitude plane waves is addressed. Although many of the developments are general, the emphasis is on the determination of stress and density fields from particle velocity measurements. Practical considerations for embedded particle velocity and stress gauge measurements are discussed. Difficulties with existing analysis methods are described. The use of wave similarity as a criterion for determining the preferred analytic approach is emphasized. Simple waves are easily analyzed using the approaches suggested by Fowles, Cowperthwaite, and Williams J. Appl. Phys. 41, 360 (1970); 42, 456 (1971)]. Nonsimple waves, of broader interest, are best analyzed using surfaces explicitly fit to measured histories and directly integrating the conservation equations. Analytic and numerical examples of the surface‐fitting procedure are presented. Uniqueness and verification of calculated results in past and present work are discussed.read more
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Journal ArticleDOI
Ramp compression of diamond to five terapascals
Raymond F. Smith,Jon Eggert,Raymond Jeanloz,Thomas S. Duffy,Dave Braun,J. R. Patterson,Robert E. Rudd,J. Biener,Amy Lazicki,A. V. Hamza,Jason J. Wang,T. Braun,Lorin X. Benedict,P. M. Celliers,Gilbert Collins +14 more
TL;DR: Ramp-compression measurements for diamond are described, which can be compared to first-principles density functional calculations and theories long used to describe matter present in the interiors of giant planets, in stars, and in inertial-confinement fusion experiments, and provide new constraints on mass–radius relationships for carbon-rich planets.
Journal ArticleDOI
Dynamic compression of materials: metallization of fluid hydrogen at high pressures
Abstract: Dynamic high pressure is 1 GPa (10 kbar) or greater with a rise time and a duration ranging from 1 ps (10−12 s) to 1 µs (10−6 s). Today it is possible in a laboratory to achieve pressures dynamically up to ~500 GPa (5 Mbar) and greater, compressions as much as ~15-fold greater than initial density in the case of hydrogen and temperatures from ~0.1 up to several electronvolts (11 600 K). At these conditions materials are extremely condensed semiconductors or degenerate metals. Temperature can be tuned independently of pressure by a combination of shock and isentropic compression. As a result, new opportunities are now available in condensed matter physics at extreme conditions. The basic physics of the dynamic process, experimental methods of generating and diagnosing matter at these extreme conditions and a technique to recover metastable materials intact from ~100 GPa shock pressures are discussed.Results include (i) generation of pressure standards at static pressures up to ~200 GPa (2 Mbar) at 300 K, (ii) single-shock compression of small-molecular fluids, including resolution of the recent controversy over the correct shock-compression curve of liquid D2 at 100 GPa pressures, (iii) the first observations of metallization of fluid hydrogen, nitrogen and oxygen compressed quasi-isentropically at 100 GPa pressures, (iv) implications for the interiors of giant planets within our solar system, extrasolar giant planets and brown dwarfs discovered recently and the equation of state of deuterium–tritium in inertial confinement fusion (ICF) and (v) prospects of recovering novel materials from extreme conditions, such as metastable solid metallic hydrogen. Future research is suggested.
Journal ArticleDOI
Experimental configuration for isentropic compression of solids using pulsed magnetic loading
C.A. Hall,James R. Asay,Marcus D. Knudson,William A. Stygar,R. B. Spielman,T. D. Pointon,David Reisman,Arthur Toor,R. C. Cauble +8 more
TL;DR: Hall as mentioned in this paper describes a modular configuration that improves the uniformity of loading over the sample surface, allows materials to be easily attached to the magnetically loaded sample, and improves the quality of data obtained.
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Magnetically driven isentropic compression experiments on the Z accelerator
David Reisman,Arthur Toor,R. C. Cauble,C.A. Hall,James R. Asay,Marcus D. Knudson,M. D. Furnish +6 more
TL;DR: Isentropic compression experiments (ICE) have been performed on the Z accelerator facility at Sandia National Laboratory as mentioned in this paper, which used large magnetic fields to slowly compress samples to pressures in excess of 400 kbar.
Journal ArticleDOI
Experimental measurement of the principal isentrope for aluminum 6061-T6 to 240 GPa
TL;DR: In this article, an absolute measurement of stress and density along the principal compression isentrope is obtained for solid aluminum to 240GPa, using a backward integration technique, with approximate accounting for unknown systematic errors in experimental timing.
References
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Physics of shock waves and high-temperature hydrodynamic phenomena
Ya. B. Zel'dovich,Yu. P. Raizer +1 more
TL;DR: The physics of high-temperature hydrodynamic phenomena is discussed in this article, where the authors present interpretations of the physical basis of shockwave and high temperature hydrodynamics and give practical guidance to those who work with these subjects.
Book
Supersonic flow and shock waves
Richard Courant,Kurt Friedrichs +1 more
TL;DR: In this article, the authors proposed a method to compressible ecoulement for compressible compressible and supersonique and onde de choc Reference Record created on 2005-11-18, modified on 2016-08-08
Journal ArticleDOI
Shock‐Wave Studies of PMMA, Fused Silica, and Sapphire
Lynn M. Barker,R. E. Hollenbach +1 more
TL;DR: In this paper, the authors measured the shock wave propagation characteristics of polymethyl methacrylate (PMMA), fused silica, and sapphire for both compressive and rarefaction waves using plate-impact experiments and interferometer instrumentation techniques.
Shock waves in condensed matter-1981
TL;DR: In this article, the authors provided a format for scientific interactions on questions of physico-chemical properties and processes of condensed matter under shock compression, which produces unique and extreme states for scientific investigation.
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