舱室密闭空间中爆炸载荷燃烧增强效应试验研究

为研究梯恩梯(TNT)爆炸产物的燃烧释放能量对密闭空间中的爆炸载荷增强效应，开展7.50 g、11.25 g、15.00 g、22.50 g、30.00 g 5种不同质量的TNT分别在空气和氦气环境（抑制燃烧）密闭空间中的爆炸试验。通过压力、温度传感器及三维数字图像相关技术，得到爆炸载荷历程、准静态压力、封闭空间内气体温度、金属板试件的动态响应和最终变形等试验数据。对试验结果的分析和对比发现：TNT爆炸产物的燃烧效应对封闭舱室内的爆炸载荷与结构响应影响显著，5种不 同质量TNT在氦气环境中爆炸的准静态压力、温度峰值相较对应的空气工况中的降幅分别在38.81%~46.85%和57.53%~76.35%；试件最终变形较空气工况的降幅在19.1%~48.9%；建议在结构内爆响应的计算评估中应考虑爆炸载荷燃烧增强效应的影响。

Experimental Study of Afterburning Enhancement Effect for Blast Load in Confined Compartment Space

In order to investigate the afterburning enhancement effect of detonation products for the blast load in a confined space, the explosion experiments of 5 different masses of TNT were performed in the confined spaces filled with air and helium. The data about shockwave-time history, quasi-static pressure, temperature of mixed gas in a confined space, and both the dynamic response and final deformation of steel plates were recorded by using the pressure and temperature sensors and the three-dimensional digital image correlation (DIC) method. The experimental results were analyzed and compared. The results show that the afterburning of detonation products of TNT has a dramatic influence on the confined blast load and the structural responses. The quasi-static pressures and temperature peaks of the five different masses of TNT explosions in helium environment are reduced by 38.81%-46.85% and 57.53%-76.35%, respectively, and the final deformation of tested specimens are decreased by 19.1%-48.9% compared with those of TNT explosions in air environment. It is suggested that the afterburning enhancement effect of detonation products for the confined blast load should be taken into account in predicting the dynamic responses of structures. Key