An Assessment of the Performance of the History Variable Reactive Bum Explosive Initiation Model in the CTH Code
Final rept. 1 Oct 95-30 Jun 97
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS TECHNOLOGY DIRECTORATE
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We exercised the History Variable Reactive Burn HVRB model in the CTH code, simulating a number of common explosive sensitivity experiments, including sustained- and pulsed-shock initiation, projectile-impact initiation, and detonation failure. Predictions of sustained-shock initiation are accurate in accordance with the calibration of the model. Predictions of pulsed-shock initiation are only somewhat more accurate than those achieved previously using Forest Fire. Predictions of projectile-impact initiation are much better. The results for bare explosive show excellent agreement with experiment for both flat- and round-tipped projectiles. With a 2-mm tantalum cover, the agreement is nearly as good. With a 2-mm tantalum cover, the agreement deteriorates for flat-tipped projectiles, while remaining adequate in the case of round-tipped projectiles. The failure radius and thickness predicted with CTH exhibit minimam near which the solutions are most stable as functions of zone dimension, but do not appear to converge. These minimum values agree well with experiment. Although no converged solutions were obtained, the most stable failure thickness is approximately equal to the most stable failure radius.
- Ammunition and Explosives