Edri Idan E, Grisaro Hezi Y, Yankelevsky David Z
Faculty of Civil & Environmental Engineering, National Building Research Institute, Technion-Israel Institute of Technology, Haifa, Israel.
Faculty of Civil & Environmental Engineering, National Building Research Institute, Technion-Israel Institute of Technology, Haifa, Israel.
J Hazard Mater. 2019 Jul 15;374:248-257. doi: 10.1016/j.jhazmat.2019.04.043. Epub 2019 Apr 13.
The peak gas pressure developed as a result of a confined explosion is an important parameter characterizing the pressure signal and is crucial for assessment of the structural response of the confined space envelope elements. The gas pressure depends on the amount of the released energy, including the afterburning energy. A new analytical model is presented to predict the gas pressure developed in a confined volume, for different types of explosives, as function of the charge weight (W) and the free confined volume (V), considering the afterburning effect. The model is based on the detonation chemical reaction and on the calculation of a full or partial afterburning energy release due to the reaction of the fuels in the detonation products with the surrounding oxygen. Considering the detonation energy and the possible additional afterburning energy, the model demonstrates the different behavior of the gas pressure variation with W/V for different types of explosives. The equivalent TNT charge weight is calculated for each explosive. According to the analysis performed, the TNT equivalent factor varies with W/V. The predictions of the model results are compared with available models as well as with available test data and very good agreement is obtained.
由受限爆炸产生的峰值气体压力是表征压力信号的一个重要参数，对于评估受限空间围护结构元件的结构响应至关重要。气体压力取决于释放的能量，包括二次燃烧能量。提出了一种新的分析模型，用于预测在不同类型炸药作用下，受限空间内产生的气体压力，该模型将气体压力表示为装药重量（W）和自由受限体积（V）的函数，并考虑了二次燃烧效应。该模型基于爆轰化学反应以及对由于爆轰产物中的燃料与周围氧气反应而导致的全部或部分二次燃烧能量释放的计算。考虑到爆轰能量和可能的额外二次燃烧能量，该模型展示了不同类型炸药的气体压力随W/V的变化行为。计算了每种炸药的等效TNT装药重量。根据分析结果，TNT等效系数随W/V而变化。将模型结果的预测与现有模型以及现有试验数据进行了比较，得到了很好的一致性。
