Experimental Verification of a Theoretical Loading Function Describing Momentum Transfer from an Explosion to a Tree Stem
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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This study was conducted to validate methods previously developed by the Waterways Experiment Station to theoretically predict the clearing capability of a given explosive at a selected site in a forested area to be used as a helicopter landing zone. The prediction depends largely on a theoretical loading function used in the solution of a partial differential equation that describes the motion of a tree stem being acted upon by a shock front. Special equipment was designed to evaluate the loading function in terms of the impulse experienced by free-flying logs, which represented the tree stems. Seven explosions of 0.09-metric-ton TNT equivalent yield were detonated to provide adequate data for evaluation. Each explosion was monitored for the correct yield and shock-front symmetry. The results show good agreement between the stem loading predicted by the theoretical loading function and the actual loading experienced by the logs during the tests.
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