火炸药学报

为了研究PBX炸药在完全约束加载和剪切流动加载下的点火性能,采用一级轻气炮对完全约束、剪切流动(不同开孔直径)的实验样弹进行加载,采用高速摄影记录了PBX炸药装药在冲击加载过程中的反应情况,并通过压力传感器测得了加载过程中的应力曲线。使用LS-DYNA软件对完全约束加载和剪切流动加载进行四分之一模型仿真计算,用完全约束下应力参数进行模型参数校核,使用校核的模型参数对剪切流动实验进行计算,获得了炸药在不同条件下的流动速率等参数。结果表明,炸药在剪切流动加载过程中相比于完全约束的装药更容易发生反应; 剪切流动加载过程中,PBX炸药是否发生反应,不仅与剪切流动速率有关,而且还与单位时间流量有关,3mm开孔直径单位时间流量比2mm开孔直径增加62%。

In order to investigate the ignition performance of PBX explosives under full-constrained and shear-flow loading, the experimental projectile was tested by using a one-stage light gas gun. High-speed photography was used to record the reaction of the PBX explosive charges, and the stress curves in the loading process were measured by pressure sensor. A quarter of the model was used to simulate the full-constrained and shear-flow loading cases by using LS-DYNA software. The stress under full-constrained condition was used for the verification of the model parameters. Further, the model parameters verified was used to calculate the shear-flow loading case, and the flow velocity and other parameters of explosives under different conditions were obtained. The results show that the reaction of PBX explosives occurs more easily under shear-flow loading than the full constrained loading. Not only the shear flow rate but also the unit time flow rate have significant influence on the PBX explosives reaction. The rate of the shear-flow with 3mm diameter is 62% faster than that with 2mm diameter.

引言
1 实验
2 结果与讨论
3 数值模拟

图1 实验系统示意图<br/>Fig.1 Schematic diagram of the experimental system

图1 实验系统示意图
Fig.1 Schematic diagram of the experimental system

图2 加载示意图和装配图<br/>Fig.2 Loading schematic and assembly of experiment

图2 加载示意图和装配图
Fig.2 Loading schematic and assembly of experiment

表1 PBX炸药加载实验结果<br/>Table 1 Loading results of PBX explosive

表1 PBX炸药加载实验结果
Table 1 Loading results of PBX explosive

图3 完全约束PBX炸药实验结果<br/>Fig.3 Fully constrained results of PBX explosives

图3 完全约束PBX炸药实验结果
Fig.3 Fully constrained results of PBX explosives

图4 开孔PBX炸药实验结果<br/>Fig.4 Experiment results of PBX explosives with hole

图4 开孔PBX炸药实验结果
Fig.4 Experiment results of PBX explosives with hole

图5 PBX炸药在剪切流动状态时的反应情况<br/>Fig.5 PBX explosives react in shear-flow process

图5 PBX炸药在剪切流动状态时的反应情况
Fig.5 PBX explosives react in shear-flow process

图6 完全约束样弹加载过程中应力随时间的变化曲线<br/>Fig.6 Stress versus time curve during full-constrained loading

图6 完全约束样弹加载过程中应力随时间的变化曲线
Fig.6 Stress versus time curve during full-constrained loading

图7 数值模拟计算模型图<br/>Fig.7 The simulation model

图7 数值模拟计算模型图
Fig.7 The simulation model

表2 数值模拟计算材料模型参数<br/>Table 2 Materials parameters in simulation model

表2 数值模拟计算材料模型参数
Table 2 Materials parameters in simulation model

图8 下击柱应力数值模拟计算和实验测定值对比<br/>Fig.8 Comparison of the simulation and experimental stress of lower strike

图8 下击柱应力数值模拟计算和实验测定值对比
Fig.8 Comparison of the simulation and experimental stress of lower strike

图9 炸药加载剪切流动过程<br/>Fig.9 Shear-flow process of explosive 4 结论

图9 炸药加载剪切流动过程
Fig.9 Shear-flow process of explosive 4 结论

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备注

引言

1 实验

2 结果与讨论

3 数值模拟

期刊信息

备注

引言

1 实 验

2 结果与讨论

3 数值模拟

期刊信息

1 实验