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An improved technique of expanding metal ring experiment under high explosive loading
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Image of FIG. 1.
FIG. 1.

Schematic illustration of charged and discharged system and current measurement of discharge circuit through the Rogowski coil.

Image of FIG. 2.
FIG. 2.

The current response of copper wire recorded by Rogowski coil, which is captured by a digital oscilloscope. The inflexed site of plasma formation denotes the initiation of explosion.

Image of FIG. 3.
FIG. 3.

Schematic arrangement for expanding ring experiment imposed by wire explosion of the exploding wire.

Image of FIG. 4.
FIG. 4.

Expansion velocity-time history of two PETN diameters: (a) 10 mm; (b) 12 mm, each of which has three independent tests.

Image of FIG. 5.
FIG. 5.

The stress-strain response of OFE copper determined from the data in Fig. 4 and numerically obtained using Johnson-Cook model. The dot line represents the SHPB result at a strain rate of 5000 s−1.

Image of FIG. 6.
FIG. 6.

(a) Experimental setup of seven aluminium rings; (b) reassembled fragments for different rings.

Image of FIG. 7.
FIG. 7.

The complementary cumulative distribution of fragment number as a function of fragment size. The dashed line denotes the Weibull fit of the experimental data.


Generic image for table
Table I.

Dimensions of test rings and PETN and PETN mass.


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Scitation: An improved technique of expanding metal ring experiment under high explosive loading