弹粘塑性双球壳塌缩热点反应模型

温丽晶; 段卓平; 张震宇; 欧卓成; 黄风雷

doi:10.11858/gywlxb.2011.06.003

弹粘塑性双球壳塌缩热点反应模型

doi: 10.11858/gywlxb.2011.06.003

1.
北京理工大学爆炸科学与技术国家重点实验室，北京 100081；
2.
国防科技大学理学院技术物理研究所，湖南长沙 410073

详细信息

通讯作者:
段卓平 E-mail:duanzp@bit.edu.cn

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出版历程
- 收稿日期: 2010-10-10
- 修回日期: 2011-03-28
- 发布日期: 2011-12-15

An Elastic/Viscoplastic Pore Collapse Model of Double-Layered Hollow Sphere for Hot-Spot Ignition in Shocked Explosives

1.
State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China;
2.
Institute of Technical Physics, College of Science, National University of Defense Technology, Changsha 410073, China

摘要

摘要: 基于Kim的弹粘塑性单球壳塌缩模型，考虑PBX炸药中的粘结剂效应，假设炸药和粘结剂均为弹粘塑性材料，建立了弹粘塑性双球壳塌缩热点反应模型，给出了炸药球壳在冲击压力作用下的速度、应变、温度和化学反应速率的时空分布，以及新的热点反应速率理论表达式。把新的热点反应项与Kim的低压下慢反应项和张震宇提出的高压反应速率方程相结合，得到了新的冲击起爆三项式细观反应速率模型。把该模型加入DYNA2D中，模拟了PBX-9501炸药的一维冲击起爆过程，结果表明：该模型除了可以解释炸药颗粒度和孔隙度的影响外，还可以较好地描述粘结剂强度和含量对PBX炸药冲击起爆感度的影响。
- 冲击起爆 /
- 反应速率模型 /
- 热点点火模型 /
- PBX炸药 /
- 粘结剂
Abstract: An elastic/viscoplastic pore collapse model of double-layered hollow sphere, in which the effect of the binder in Plastic Bonded Explosives (PBX) was taken into account, was developed as a hot-spot ignition model in shocked explosives. The space and time distributions of the velocity, strain, temperature and chemical reaction rate in shock compression of the explosive hollow sphere were theoretically calculated. A new expression of reaction rate equation was obtained for the hot-spot ignition. The three-term reaction rate model, consisting of the new hot-spot ignition term, the slow burning term at low-pressure from Kim and the high-pressure reaction term from ZHANG Zhen-Yu, was implemented into the two-dimensional, hydrodynamic finite-element code DYNA2D and used to simulate the one-dimensional shock initiation process of PBX-9501 explosive. The numerical results show that the model can successfully explain the influence of strength and content of the binder in PBX on the shock initiation, and that of particle size and porosity as well.
- shock initiation /
- reaction rate model /
- hot-spot ignition model /
- plastic bonded explosives /
- binder

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参考文献(21)

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