Method for Hugoniot Equation-of-State Measurements at Extreme Pressures

Fowles, G. R.; Isbell, William M.

doi:10.1063/1.1714313

Cited by 42 publications

(8 citation statements)

References 3 publications

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“…The Mach lens configuration is an extension of a method used with explosives to generate extreme pressures [4]. Relating the same concepts to an inert plate impact configuration [5], the target consists simply of two concentric cylinders as shown in Figure 4.…”

Section: Mach Lens Configurationmentioning

confidence: 99%

Shockwaves in Converging Geometries

Brown¹,

Ravichandran²

2009

AIP Conference Proceedings

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Abstract.Plate impact experiments are a powerful tool in equation of state (EOS) development, but are inherently limited by the range of impact velocities accessible to the gun. In an effort to dramatically increase the range of pressures which can be studied with available impact velocities, a new experimental technique is being developed. The possibility of using a confined converging target to focus Shockwaves and produce a large amplitude pressure pulse is examined. When the planar shock resulting from impact enters the converging target the impedance mismatch at the boundary of the confinement produces reflected Mach waves and the subsequent wave interactions produce a diffraction cycle resulting in increases in the shock strength with each cycle. Since this configuration is limited to relatively low impedance targets, a second technique is proposed in which the target is two concentric cylinders designed such that the inner cylinder will have a lower shock velocity than the much larger shock velocity in the outer cylinder. The resulting dispersion in the wave front creates converging shocks, which will interact and eventually result in a steady Mach configuration with an increase in pressure in the Mach disk. Numerical simulations indicate a significant increase in pressure for both methods and show promise for the proposed concepts.

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Section: Mach Lens Configurationmentioning

confidence: 99%

Shockwaves in Converging Geometries

Brown¹,

Ravichandran²

2009

AIP Conference Proceedings

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“…Another such system has been described by Fowles and lsbell 24 in which a cylindrical block is surrounded by high explosive. A detona tion wave propagates along the high ex plosive, and a conical shock wave is In duced in the material.…”

Section: Pig 28 Geometrical Representation Formentioning

confidence: 99%

Use of Shock Waves in the Vaporization of Metals.

Ahrens¹,

Urtiew²

1971

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“…Upon convergence, the conical analog of a Mach reflection has been shown to occur. [8][9][10][11] The Mach wave consists of the incident shock joining with the reflected shock and Mach stem to form the stable shock solution shown in Fig. 1.…”

Section: A Target Configurationmentioning

confidence: 99%

High Pressure Hugoniot Measurements Using Converging Shocks

Brown

Ravichandran

2011

Dynamic Behavior of Materials, Volume 1

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Plate impact experiments are a powerful tool in equation of state development, but are inherently limited by the range of impact velocities accessible to the facility. In an effort to dramatically increase the range of pressures which can be studied with available impact velocities, a new experimental technique is examined. The target plate is replaced by a composite assembly consisting of two concentric cylinders. The target is designed such that the initial shock velocity in a well-characterized outer cylinder is higher than in the inner cylinder material of interest. Conically converging shocks will be generated at the interface due to the impedance mismatch between the two materials and axisymmetric geometry. Upon convergence, an irregular reflection occurs and the conical analog of a Mach reflection develops. This Mach reflection grows until it reaches a steady state, at which point the high pressure state in the Mach disk can be measured using velocity interferometry and impedance matching techniques. The technique is demonstrated by studying the shock response of copper. A strong confinement setup utilizes a low impedance 6061-T6 aluminum outer cylinder and the weak confinement case features a higher impedance molybdenum outer cylinder. The experimental results for copper are in good agreement with a simple analytical model, numerical simulations, and data in the literature. The possibility of utilizing full field measurements to make multiple Hugoniot measurements is also examined.

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Method for Hugoniot Equation-of-State Measurements at Extreme Pressures

Cited by 42 publications

References 3 publications

Shockwaves in Converging Geometries

Shockwaves in Converging Geometries

Use of Shock Waves in the Vaporization of Metals.

High Pressure Hugoniot Measurements Using Converging Shocks

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