Precision stress measurements in severe shock-wave environments with low-impedance manganin gauges

Vantine, H. C.; Chan, J.; Erickson, L.M.; Janzen, J.; Weingart, R.C.; Lee, Ron

doi:10.1063/1.1136038

Cited by 45 publications

(10 citation statements)

References 7 publications

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“…Also used were PZT Crystal pins to measure the projectile velocity and tilt (planarity of impact). During the experiment, oscilloscopes measure change of voltage as result of resistance change in the gauges which were then converted to pressure using the hysteresis corrected calibration curve published elsewhere [11,12].…”

Section: Methodsmentioning

confidence: 99%

SHOCK INITIATION EXPERIMENTS ON PBX 9501 EXPLOSIVE AT PRESSURES BELOW 3 GPa WITH ASSOCIATED IGNITION AND GROWTH MODELING

Chidester¹,

Thompson²,

Vandersall³

et al. 2008

AIP Conference Proceedings

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Abstract. Shock initiation experiments on the explosive PBX 9501 (95% HMX, 2.5% estane, and 2.5% nitroplasticizer by weight) were performed at pressures below 3 GPa to obtain in-situ pressure gauge data, run-distance-to-detonation thresholds, and Ignition and Growth modeling parameters. Propellant driven gas guns (101 mm and 155 mm) were utilized to initiate the PBX 9501 explosive with manganin piezoresistive pressure gauge packages placed between sample slices. The run-distance-to-detonation points on the Pop-plot for these experiments showed agreement with previously published data and Ignition and Growth modeling parameters were obtained with a good fit to the experimental data. This parameter set will allow accurate code predictions to be calculated for safety scenarios in the low-pressure regime (below 3 GPa) involving PBX 9501 explosive.

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Section: Methodsmentioning

confidence: 99%

SHOCK INITIATION EXPERIMENTS ON PBX 9501 EXPLOSIVE AT PRESSURES BELOW 3 GPa WITH ASSOCIATED IGNITION AND GROWTH MODELING

Chidester¹,

Thompson²,

Vandersall³

et al. 2008

AIP Conference Proceedings

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“…The gauges are armored with thin (125 µm) Teflon insulation on both sides to prevent shorting of the gauges in a conductive medium when the material becomes reactive. Other details of the manganin pressure gauges are described in our previous publications (3,4).…”

Section: Experimental Techniquementioning

confidence: 99%

Shock initiation of composition B and C-4 explosives: Experiments and modeling

Urtiew

Vandersall

Tarver

et al. 2008

Russ. J. Phys. Chem. B

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Shock initiation experiments on the explosives Composition B and C-4 were performed to obtain in-situ pressure gauge data for the purpose of providing the Ignition and Growth reactive flow model with proper modeling parameters. A 100 mm diameter propellant driven gas gun was utilized to initiate the explosive charges containing manganin piezoresistive pressure gauge packages embedded in the explosive sample. Experimental data provided new information on the shock velocityparticle velocity relationship for each of the investigated material in their respective pressure range. The run-distance-to-detonation points on the Pop-plot for these experiments showed agreement with previously published data, and Ignition and Growth modeling calculations resulted in a good fit to the experimental data. Identical ignition and growth reaction rate parameters were used for C-4 and Composition B, and the Composition B model also included a third reaction rate to simulate the completion of reaction by the TNT component. This model can be applied to shock initiation scenarios that have not or cannot be tested experimentally with a high level of confidence in its predictions.

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“…Its resistance is very nearly independent of temperature [37,38], which makes it a good gauge to study reaction build-up in explosives The Lawrence Livermore National Laboratory (LLNL) standard manganin gauge is fabricated using annealed, shunt grade manganin foil of 25.4 mm thickness [17,18,39,40]. The foil is composed of 85.90 wt.% copper, 9.5 % manganese, 4 % nickel, 0.5 % iron, and 0.1 % silica.…”

Section: Manganin Stress Gaugementioning

confidence: 99%

Experimental Techniques

Forbes

2012

Shock Wave Compression of Condensed Matter

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This chapter is a summary of a few selected experimental techniques to acquaint you with measuring shock wave parameters. It gives physical insight into practical use of impedance matching for obtaining data from experiments. It is not an exhaustive description of techniques since that would be a book by itself!The ever-increasing capability in computer technology has lead to more sophisticated numerical modeling of physical phenomena that requires ever more accurate high strain rate experiments especially shock wave measurements. The demand is for faster (fraction of a ms) and more accurate measurements during the initial event as well as for relatively long times (a few ms) after the initial shock event. Thus upgrading and improving experimental diagnostics are continually important in shock wave physics. It is also important to use different experimental tools to validate material models. Explosive and Flyer Plate Shock Driver SystemsThe major difference in shock waves generated by the impact of flat flyer plates versus plane 1-D shocks generated by in-contact explosives is the pressure-distance profiles. Flyer plate impacts create a steady pressure over a distance x while incontact explosive systems have a quasi-triangular shape as illustrated in Fig. 4.1.The flyer-plate shock systems can be explosively driven or gas driven from a smooth bore gun. The flat-top shocks have constant P, T, u, and r for a few ms's. This allows the experimental parameters to be measured accurately with a variety of techniques. In contrast, explosive in-contact shock systems create a pressure pulse that varies in time (quasi-triangular shape). The pressure drop behind the

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Precision stress measurements in severe shock-wave environments with low-impedance manganin gauges

Cited by 45 publications

References 7 publications

SHOCK INITIATION EXPERIMENTS ON PBX 9501 EXPLOSIVE AT PRESSURES BELOW 3 GPa WITH ASSOCIATED IGNITION AND GROWTH MODELING

SHOCK INITIATION EXPERIMENTS ON PBX 9501 EXPLOSIVE AT PRESSURES BELOW 3 GPa WITH ASSOCIATED IGNITION AND GROWTH MODELING

Shock initiation of composition B and C-4 explosives: Experiments and modeling

Experimental Techniques

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