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高温下带金属壳PBX炸药低速撞击敏感性数值模拟
引用本文:胡偲,吴艳青,黄风雷.高温下带金属壳PBX炸药低速撞击敏感性数值模拟[J].爆炸与冲击,2019,39(4):25-36.
作者姓名:胡偲  吴艳青  黄风雷
作者单位:北京理工大学爆炸科学与技术国家重点实验室,北京,100081;北京理工大学爆炸科学与技术国家重点实验室,北京,100081;北京理工大学爆炸科学与技术国家重点实验室,北京,100081
基金项目:科学挑战专题(TZ2016001);国家自然科学基金(11572045,11472051);中物院安全弹药研发中心开放基金(RMC2015B03)
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。

关 键 词:PBX炸药  热力耦合  撞击  敏感性
收稿时间:2017-07-10

Numerical simulation of confined PBX charge under low velocity impact at high temperature
HU Cai,WU Yanqing,HUANG Fenglei.Numerical simulation of confined PBX charge under low velocity impact at high temperature[J].Explosion and Shock Waves,2019,39(4):25-36.
Authors:HU Cai  WU Yanqing  HUANG Fenglei
Institution:State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Abstract:Accidental initiations of the explosive subjected to mechanical or thermal loads have caused numerous catastrophic tragedies. The impact sensitivity and thermal safety of explosive is of great importance for the applications. Previous work showed an evident decline on modulus with increasing cook-off temperature, which suggest that Cook-off temperature may affect the deformation process of the impacted PBX, and further affect the critical impact velocities for initiation. In this work, to investigate the mechanical and thermal response of confined PBX charge under low velocity impact of a small projectile during cook-off events, a finite-element model was established to provide reliable prediction of explosive safety performance at high temperature. A thermal-mechanical-combined experiments from literature enabled comparisons between simulated results and measured data for the critical impact velocities of initiation for a HMX-based PBX charge (HMX/TATB/olefin). The simulation results showed that when it was heated up to 348.15 K, the critical impact velocity of initiation for the explosives reached the maximum (360 m/s). With the increase of cook-off temperature, the localized heating regions change from the surface of explosive charge to the center. This phenomenon was caused by the effect of compression overshadows shearing on the initiation because of the strength decreases in the heated PBX, implying that thermal softening plays an important role in the impact sensitivity of the heated PBX charge.
Keywords:PBX  thermal-mechanical coupling  impact  sensitivity
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