ESKIMO (Explosive Safety Knowledge Improvement Operation) VII Test Results
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CA
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ESKIMO VII, seventh in the series of Explosive Safety Knowledge Improvement Operation Tests, was conducted to determine the safety and performance of Navy box-shaped ammunition storage magazines. The two magazines tested, the Type A new design and Type IIB old design, were the remaining half-scale structures from the July 1980 ESKIMO VI test. The Type A magazine was tested using a foam High Explosive Simulation Technique HEST on its roof. The Type IIB magazine was tested one week later using a small hemispherical surface charge of 13,616 pounds of TNT. The two interior columns of the Type A magazine catastrophically collapsed when subjected to a HEST impulse approximately three times greater than the design impulse. Although the yield-line pattern and response predicted for the flat-slab structure never occurred, the roof remained intact while undergoing maximum support rotations of 16 degrees. These data indicate a high probability of eliminating the columns from future magazines by utilizing the tremendous energy absorbing properties associated with tensile membrane behavior of restrained slabs. The redesigned door and headwall system for the Type IIB magazine survived the blast loading conditions approximating those at the minimum side-to-side spacing earth-covered magazines with only minor structural damage. These data indicate that the structural re-design used in this test is more than adequate to prevent sympathetic detonation.
- Safety Engineering
- Ammunition and Explosives