Ignition Characteristics of PBX Explosives at Meso-Structural Level under Shock and Ramp Loading
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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。
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关键词:
- 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. -
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. 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 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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