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Application of tape-cast graded impedance impactors for light-gas gun experiments
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10.1063/1.2756058
/content/aip/journal/jap/102/2/10.1063/1.2756058
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/2/10.1063/1.2756058

Figures

Image of FIG. 1.
FIG. 1.

Density and layer thickness as a function of volume percent Mg for monolithic pellets fabricated by hot-pressing the tape cast Mg-Cu powder mixtures.

Image of FIG. 2.
FIG. 2.

SEM micrographs of fracture surfaces from monolithic pellets fabricated from tape cast powders: (a) Mg, (b) Mg, (c) Mg, (d) Mg (balance Cu).

Image of FIG. 3.
FIG. 3.

Longitudinal sound wave velocity and acoustic impedance as a function of volume percent Cu for monolithic pellets fabricated by hot-pressing the tape cast Mg-Cu powder mixtures. The dotted line shows velocities predicted by the Reuss (constant stress) model, and the solid line shows velocities predicted by the Voigt (constant strain) model.

Image of FIG. 4.
FIG. 4.

(a) Impedance profile and layer stacking sequence for an initial graded impactor fabricated from seven compositions of tape cast Mg-Cu powders. (b) SEM micrograph of a polished cross section of the graded impactor in (a).

Image of FIG. 5.
FIG. 5.

C-Scan of a graded impactor which also has seven tape compositions, but a slightly different profile than in Fig. 4.

Image of FIG. 6.
FIG. 6.

Impedance profile and layer stacking sequence for a graded impactor fabricated from 19 compositions of tape cast Mg-Cu powders.

Image of FIG. 7.
FIG. 7.

White light interferometer (Zygo) profile of surface flatness for the impactor profiled in Fig. 6. Top: Mg side. Bottom: Cu side.

Image of FIG. 8.
FIG. 8.

Line-outs from Fig. 7 for the impactor profiled in Fig. 6. (a) Mg, (b) Cu, (c) difference between (a) and (b) giving an overall indication of the flatness and parallelism of the impactor.

Image of FIG. 9.
FIG. 9.

Particle velocity versus compression time for gas gun experiments using graded impactors with seven (left axis) and 19 (right axis) composition layers to impact 2 mm thickness Al targets. The impact velocities were 1.67 and 1.93 km/s, respectively.

Image of FIG. 10.
FIG. 10.

A 1D hydrodynamic simulation of the graded impactor striking an Al target shows how a discretely layered impactor imparts a pressure ramp to the target. The pressure is shown as a function of position relative to the impact plane at 0.0 mm. To the left is the graded impactor and to the right is the Al target. Initially a shock wave propagates from the impact plane to both the left and right (gray line ); then a pressure ramp is created in accord with the impedance profile of the impactor, which propagates into the target. The solid line is at and subsequent traces represent time increments of .

Tables

Generic image for table
Table I.

Measured characteristics of several graded impactors fabricated from the tape cast Mg-Cu powder mixtures. Values are expressed as the percentage of that predicted from the stacking sequence and the individual tape characteristics.

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/content/aip/journal/jap/102/2/10.1063/1.2756058
2007-07-17
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Application of tape-cast graded impedance impactors for light-gas gun experiments
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/2/10.1063/1.2756058
10.1063/1.2756058
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