火炸药学报

为了揭示炸药装药在过载条件下的点火机制,针对炸药抗过载性能评估装置,采用黏弹性统计裂纹(Visco-SCRAM)模型描述炸药的力学与热学行为,将Visco-SCRAM模型以二次开发的方式嵌入LS-DYNA,通过LS-DYNA对炸药装药在过载条件下的响应过程进行计算,通过炸药抗过载性能评估试验装置对DNAN基熔注炸药(RBHL-1)进行测试。结果表明,DNAN基熔注炸药(RBHL-1)的重锤阈值速度为9.0～9.5m/s,当重锤速度超过阈值速度时,炸药药柱上表面发生点火; 点火位置位于炸药装药上表面,重锤速度阈值为9.26m/s; 数值模拟与试验结果对比表明,Visco-SCRAM模型能够准确预测炸药的点火位置和重锤阈值速度,说明剪切摩擦是抗过载性能评估试验中炸药的点火机制; 同时,提高炸药装药质量及炸药中对含能材料的保护能力是提高炸药抗过载性能的重要手段。

To reveal the ignition mechanism of explosive charge under overload conditions, based on the anti-overload performance evaluation device, the viscoelastic statistical crack mechanics(Visco-SCRAM)model was used to describe the mechanical and thermal behavior of explosive. The Visco-SCRAM model was embedded into LS-DYNA in the way of secondary development. The response process of explosives under overload conditions was calculated by LS-DYNA. The DNAN-based melt cast explosive(RBHL-1)was tested by the anti-overload performance evaluation device. The results show that the threshold velocity of the hammer is 9.0—9.5m/s. When the speed of the hammer exceeds the threshold velocity, the upper surface of the explosive will ignite. The ignition position locates on the upper surface of the explosive charge, and the threshold velocity of the hammer is 9.26m/s. The comparison between numerical simulation and experimental results shows that the Visco-SCRAM model can accurately predict the ignition position and threshold velocity, indicating that shear friction is the ignition mechanism of explosives in the anti-overload performance evaluation test. Meanwhile, enhancing the quality of explosive charge and the protection ability of energetic materials in explosives are effective means to improve the anti-overload performance of explosives.

引言
1 评估装置及炸药点火模型
2 结果与讨论
3 结论

图1 抗过载性能评估装置结构示意图<br/>Fig.1 Schematic diagram of anti-overload performance evaluation device

图1 抗过载性能评估装置结构示意图
Fig.1 Schematic diagram of anti-overload performance evaluation device

图2 试验件结构示意图<br/>Fig.2 Schematic diagram of the test part

图2 试验件结构示意图
Fig.2 Schematic diagram of the test part

表1 重锤打击速度的调节<br/>Table 1 The adjustment of hammer striking speed

表1 重锤打击速度的调节
Table 1 The adjustment of hammer striking speed

图3 炸药单轴压缩应力—应变曲线<br/>Fig.3 Uniaxial compressive stress-strain curve of explosives

图3 炸药单轴压缩应力—应变曲线
Fig.3 Uniaxial compressive stress-strain curve of explosives

图4 计算模型
Fig.4 The simulation model

表2 Visco-SCRAM模型参数<br/>Table 2 Parameters of Visco-SCRAM model

表2 Visco-SCRAM模型参数
Table 2 Parameters of Visco-SCRAM model

图5 重锤速度v=9m/s、t=300μs时的变量云图<br/>Fig.5 Variable cloud when the speed of hammer is 9m/s and t=300μs

图5 重锤速度v=9m/s、t=300μs时的变量云图
Fig.5 Variable cloud when the speed of hammer is 9m/s and t=300μs

图6 重锤速度v=9m/s时的变量历史曲线<br/>Fig.6 Variable history curve when the speed of hammer is 9m/s

图6 重锤速度v=9m/s时的变量历史曲线
Fig.6 Variable history curve when the speed of hammer is 9m/s

图7 不同重锤速度时A处热点温度<br/>Fig.7 The hot spot temperature of element A at different speeds of hammer

图7 不同重锤速度时A处热点温度
Fig.7 The hot spot temperature of element A at different speeds of hammer

图8 重锤速度v=9.5m/s时炸药点火前(左)后(右)状态<br/>Fig.8 The state of explosive before(left)and after(right) ignition when the speed of hammer is 9.5m/s

图8 重锤速度v=9.5m/s时炸药点火前(左)后(右)状态
Fig.8 The state of explosive before(left)and after(right) ignition when the speed of hammer is 9.5m/s

图9 试验前后试件状态<br/>Fig.9 The state of specimen before and after experiments

图9 试验前后试件状态
Fig.9 The state of specimen before and after experiments

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备注

引言

1 评估装置及炸药点火模型

2 结果与讨论

3 结论

期刊信息

备注

引言

1 评估装置及炸药点火模型

2 结果与讨论

3 结 论

期刊信息

3 结论