冲击加载和斜波加载下PBX炸药细观结构点火特性对比

王洪波; 王旗华; 卢永刚; 梁斌

doi:10.11858/gywlxb.2017.01.005

冲击加载和斜波加载下PBX炸药细观结构点火特性对比

doi: 10.11858/gywlxb.2017.01.005

中国工程物理研究院总体工程研究所，四川绵阳 621999

基金项目:

中国工程物理研究院“双百人才工程”基金 ZX04135

详细信息

作者简介:
王洪波(1986—)，女，硕士，工程师，主要从事常规战斗部相关研究.E-mail:414wanghb@caep.cn

中图分类号: TJ55;O381
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出版历程
- 收稿日期: 2015-12-08
- 修回日期: 2016-02-25

Ignition Characteristics of PBX Explosives at Meso-Structural Level under Shock and Ramp Loading

Institute of System Engineering, CAEP, Mianyang 621999, China

摘要

摘要: 基于有限元方法，采用Monte-Carlo法建立了考虑炸药颗粒尺寸、形状和位置随机分布的高聚物黏结炸药(PBX)的细观结构。计算分析了冲击加载和斜波加载下黏结剂、孔洞缺陷对PBX炸药细观结构点火特性的影响，研究发现黏结剂含量的增加有效提高了炸药的临界点火压力。相比冲击加载，斜波加载下PBX炸药的临界点火压力有明显提升。炸药内部的孔洞缺陷对临界点火压力的影响与加载方式相关，冲击加载下，孔洞缺陷降低了PBX炸药的临界点火压力；而斜波加载下，孔洞缺陷提高了PBX炸药的临界点火压力。
- 爆炸力学 /
- 高聚物黏结炸药(PBX) /
- 细观结构 /
- 冲击加载 /
- 斜波加载
Abstract: Based on the Monte-Carlo method, the meso-structural model of plastic bonded explosives (PBX) was established considering the grain size and location in random distribution by the non-linear finite element method. The influence of the binder and the defect hole to ignition characteristics of PBX in meso-structural was analyzed under shock and ramp loading. The results show that the critical pressure to ignite explosive rises with the increase of the binder content under shock and ramp loading. Compared with the results under shock loading, the critical pressure to ignite explosive under ramp loading is improved with the increase of the binder content. Also, the critical pressure to ignite explosive falls under shock loading, and rises under ramp loading due to the defect holes.
- explosion mechanics /
- plastic bonded explosives (PBX) /
- meso-structural model /
- shock loading /
- ramp loading

HTML全文

图 1 随机排列的炸药颗粒模型

Figure 1. Explosive grains in random array

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图 2 PBX炸药各细观结构及有限元网格模型^[11]

Figure 2. Mesoscale structure and finite element model of PBX^[11]

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图 3 两种不同的加载方式

Figure 3. Two kinds of loading

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图 4 冲击加载和斜波加载条件下PBX炸药计算模型

Figure 4. Calculation models of PBX under shock loading and ramp loading

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图 5 冲击加载下PBX炸药内部温度分布

Figure 5. Temperature distribution in PBX under shock loading

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图 6 PBX炸药内部点火点及其温度-时间历程

Figure 6. Ignition location and its temperature versus time in PBX

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图 7 PBX炸药内部压力分布

Figure 7. Pressure distribution of PBX

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图 8 PBX炸药内部温度分布

Figure 8. Temperature distribution of PBX

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图 9 3种不同炸药细观结构的局部孔洞缺陷分布

Figure 9. Three mesoscale models of PBX with different defect holes

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图 10 临界点火压力随炸药结构中孔洞尺寸的变化

Figure 10. Critical pressure to ignite explosives versus defect holes dimension

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图 11 两种加载方式下3种PBX炸药细观结构的点火点

Figure 11. Ignition locations in 3 mesoscale models of PBX under shock loading and ramp loading

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表 1 材料的力学性能参数^[14-16]

Table 1. Mechanical parameters of materials^[14-16]

Materials	Density /(kg/m³)	Shear modulus /(GPa)	Yield stress /(GPa)	Sound velocity /(km/s)	s	γ₀
HMX	1 900	2.700	0.10	2.901	2.06	1.100
Estane	1 100	0.270	0.01	2.350	1.70	1.000
Steel	7 850	79.000	1.85	4.570	1.49	1.930
Note: s and γ₀ are Grüneisen parameters.

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表 2 材料的热物理性能参数^{[8, 17]}

Table 2. Thermal physical parameters of materials^{[8, 17]}

Materials	λ/[W/(m·K)]	c/[J/(kg·K)]	Q/(J/g)	Z/(s^-1)	E/(J/mol)	R/[J/(mol·K)]
HMX	0.370	1 100	2 100	5×10¹⁹	2.0×10⁵	8.314
Estane	0.226	1 155
Steel	50	445

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表 3 两种黏结剂含量的PBX炸药细观结构在不同加载方式下的临界点火压力

Table 3. Critical ignition pressure of mesoscale models of PBX with different binder contents under shock and ramp loading

Loading way	Critical ignition pressure of PBX with 3.75% binder content/(GPa)	Critical ignition pressure of PBX with 7.60% binder content/(GPa)
Shock loading	5.9	6.5
Ramp loading	6.5	7.7

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