A new explosive loading technique is applied to study the uniform plastic expansion and fracture initiation of 304 stainless steel cylinders. An annular layer of dry PETN high explosive is placed in contact with the inner diameter of the cylinder and surface-initiated with an array of etched copper bridgewires. This technique produces a simultaneous detonation of the explosive and a nearly uniform expansion of the stainless steel cylinders.

COPPER PBX -9407 PHENOLIC MESH DISK RING \ ~\\\\\m& \\~\\\~ J c;yis-Ji2fll I I I ;;:~ I I I I \ I I !Call LEADS TO CAPAC ITOR FIG. 2. Mesh-initiated large area detonator-hcad-on mode of initiation. initiation point density of 3.1 x 10 5 m-2 • -FIG. 6. Breakout on surface ofPETN-inside-out mode of initiation.

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