高温下带金属壳PBX炸药低速撞击敏感性数值模拟

被引:6
作者
胡偲
吴艳青
黄风雷
机构
[1] 北京理工大学爆炸科学与技术国家重点实验室
关键词
PBX炸药; 热力耦合; 撞击; 敏感性;
D O I
暂无
中图分类号
TQ560.1 [基础理论];
学科分类号
0817 ;
摘要
炸药撞击感度和热安全性是评价炸药安全性能的重要指标。为了对高温下炸药撞击敏感性变化规律进行可靠预测,本文中通过数值模拟,研究不同预加热温度下带壳PBX炸药装药在小弹丸低速撞击下的热力学响应,得到炸药点火前至点火阶段局部高温区的位置、形态、温度和应变随时间在炸药中分布的变化。结果显示,炸药发生点火的撞击阈值速度与烤燃温度的关系并非单一随温度升高而降低,而是在加热至348.15 K时达到最高;根据温度和应力应变云图分析可得,随着烤燃温度的提高,炸药强度下降,PBX炸药装药局部高温区快速升温的主导因素由局部剪切变为压缩。热软化对炸药的撞击敏感性起重要作用。
引用
收藏
页码:27 / 38
页数:12
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