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On high explosive launching of projectiles for shock physics experiments
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10.1063/1.2746769
/content/aip/journal/rsi/78/6/10.1063/1.2746769
http://aip.metastore.ingenta.com/content/aip/journal/rsi/78/6/10.1063/1.2746769

Figures

Image of FIG. 1.
FIG. 1.

Schematic of ‘Forest Flyer’ explosive launching system for shock physics projectiles.

Image of FIG. 2.
FIG. 2.

Signals contributing to the causal angle .

Image of FIG. 3.
FIG. 3.

States in the computation of the asymptotic angle .

Image of FIG. 4.
FIG. 4.

Comparison of projectile flatness predicted from continuum dynamics simulations with different case materials and taper angles. 45° tapers used the original Forest Flyer design with a cylindrical section in the explosive charge; the other tapers were constant over the full length of the charge. The Al case with 20° taper gave much the same result as the steel.

Image of FIG. 5.
FIG. 5.

Example free surface velocity histories from two dimensional continuum dynamics simulation of explosively launched projectile, suggesting shock formation and tension (Al case, multipoint initiation). High frequency noise is from Lagrangian marker particles drifting off the surface of the projectile.

Image of FIG. 6.
FIG. 6.

Drive pressure histories predicted by one dimensional continuum dynamics simulations, for plane wave lens and multipoint initiation schemes, using the component thicknesses from the original Forest Flyer design and also for a thicker gap.

Image of FIG. 7.
FIG. 7.

Pressure histories predicted at the midplane of the projectile, for plane wave lens and multipoint initiation schemes, using the component thicknesses from the original Forest Flyer design. The horizontal line is the spall strength for Al-6061.

Image of FIG. 8.
FIG. 8.

Shock formation distances predicted as a function of drive pressure as predicted from one dimensional continuum dynamics simulations with multipoint initiation, using the component thicknesses from the original Forest Flyer design ( gap) and also for a thicker gap . The high frequency noise is from the use of a tabulated numerical calculation of the isentrope.

Image of FIG. 9.
FIG. 9.

Comparison between proton radiographs showing Forest Flyer shape just before impact and projectile shape from continuum dynamics simulations. The calculated curvature of the rear surface matches well over the central . The thin fillet at the outside is visible further back in the radiograph. The leading edge at the outside of the projectile appears further advanced in the simulations.

Tables

Generic image for table
Table I.

Projectile acceleration performance for different cases and tapers. (For the plane wave lens initiated charges, of the explosive mass is TNT rather than PBX-9501.)

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/content/aip/journal/rsi/78/6/10.1063/1.2746769
2007-06-22
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: On high explosive launching of projectiles for shock physics experiments
http://aip.metastore.ingenta.com/content/aip/journal/rsi/78/6/10.1063/1.2746769
10.1063/1.2746769
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