Observations of Shaped-Charge Jet/M30 Propellant Reactions.
Abstract
This investigation assesses both the violence of shaped-charge jet/propellant reactions and the pertinent jet-characteristics associated with this violence. The tests involved impacting 105 mm rounds which were instrumented with crush-gages and velocity screens, augmented by framing camera observations (4 microseconds between frames) taken during two tests. The violence of each test was ranked by crush-gage pressures and cartridge-case damage. Test results show that there are 3 types of violence associated with shaped-charge jet/propellant reactions: (1) non-violent, similar to hydrostatically rupturing the case due to a localized pressure; (2) moderately-violent type whose violence is similar to an electrically ignited round; and (3) severely-violent type whose violence is similar to a deflagration of high explosive. The deposited kinetic-energy was found to yield the best a priori prediction for both the type of reaction and the ranking within each type. It was hypothesized that the reaction can be characterized via 2 threshold-energy values E sub 1 and E sub 2, and 2 threshold-widths Delta E sub 1 and Delta E sub 2. Tests employing hypervelocity particles confirmed the threshold-energy hypothesis, with E sub 1 = approximately 10 kJ and E sub 2 = approximately 50 kJ for the 105-mm round. However, the hypervelocity particle and shaped charge jet data show that good a priori predictions can be made only if multiple off-axis impacts are accounted for.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1978
- Accession Number
- ADA062299
Entities
People
- A. B. Merendino
- J. N. Majerus
Organizations
- Ballistic Research Laboratory