炸药跌落响应数值模拟分析

Numerical Simulation for Spigot Tests

炸药跌落中可能出现起爆、点火和破碎三种响应,对炸药响应状态计算分析,能够为炸药安全性分析和评价提供依据,为炸药的安全防护提供指导。本研究建立了炸药spigot跌落试验的计算模型,分别对高感度的JO-9159炸药和低感度的PBXC03炸药的跌落过程进行了数值模拟分析,采用点火增长反应速率方程描述炸药起爆过程,采用炸药热力耦合和自热反应模型计算炸药点火温度,网格分离方法描述炸药破碎。计算得到了与试验结果相符的炸药反应临界跌落速度阈值范围,并给出了炸药内部温度变化和变形破碎情况。

The safety performane of explosive is investigated by analyzing three responses for spigot test： initiation, ignition and fragmentation. In this paper, the numerical model of spigot test was developed with high sensitive explosive JO-9159 and low sensitive PBXC03. The Ignition and Growth reactive （ I and G） model was used to describe initiated progress. The thermalmechanical coupling method and Arrheniusequation were used to describe ignited temperature. The elements-apart method was used to describe fragmentation of explosive. The calculated critical drop velocity is between 25 m ·s -1 and 28 m · s-1 , which is agreement with experimental results, and interior temperature and fragmentation of explosive were gained.