Single Point Pressure Approach As Input For Injury Models With Respect To Complex Blast Loading Conditions.

摘要

Blast injury models, like Axelsson and Stuhmiller, require four pressure signals as input. Those pressure signals must be acquired by a Blast Test Device (BTD) that has four pressure transducers placed in a horizontal plane at intervals of 90 degrees. This can be either in a physical test setup or in a numerical environment. However, using a BTD for blast injury assessment can be very cost-inefficient since this procedure only predicts injury at one specific location. For injury predictions at other positions a new simulation or experiment must be performed. Several single point approaches remove the need for a BTD by using the free field pressure as model input. However, it is not clear whether these will give correct results. To assess the applicability of these methods, case studies of different single point approaches have been performed for different charge weights, ranging from 9 to 5000 kg. Distances from the charges corresponded to free field lung injury threshold levels and 50% survivability levels. Results from the full BTD approach were compared with the single point methods. In particular, the influence of reflecting surfaces was studied.