Benchmark Tests for Fragmentation and Propagation Models

The FRAGPROP model predicts probabilities of propagation of detonation and burning between ammunition stacks. In order to benchmark predictions from FRAGPROP, propagation tests using 155-mm M107 ammunition were conducted. The predicted frequencies of detonation and burning propagation are somewhat greater than those observed in the tests. While the results do not provide sufficient data to validate the FRAGPROP predictions with a high level of confidence, they indicate that they are reasonable representations of the actual responses of these munitions. FRAGGEN is a simple model for estimating the fragment output. In order to benchmark its predictions of fragmentation from a missile warhead, an arena test on a single Hellfire missile was performed. Analysis indicates that the predicted distribution is accurate for the smallest fragments. Measured fragment velocities were much lower than the Gurney predictions employed by FRAGGEN. Because the configuration used in the single Hellfire test does not represent the actual storage arrangement, an arena test on two Hellfire missiles in their containers was conducted. Comparison of the fragment mass distributions produced in the two tests indicates depopulation of the smaller fragment sizes in the second test. This renders the FRAGGEN predictions inaccurate. A final arena test with two 155-mm M864 ICM projectiles containing submunitions, conducted in an attempt to develop fragmentation data for this configuration, was not successful. See also ADM001002. Presented at the Department of Defense (DOD) Explosives Safety Seminar (28th) held in Orlando, Florida on 18-20 August 1998. Published in the Proceedings of the Department of Defense (DOD) Explosives Safety Seminar (28th), 1998. The original document contains color images.