Test Method for Anti-overload Performance of Explosives

doi:10.12382/bgxb.2022.0074

Abstract

Abstract:

The test and characterization of the anti-overload performance of the explosives are important basis for the selection of penetrating warhead charge. Based on the single-degree-of-freedom forced vibration model, a testing device for the anti-overload performance of explosives is set up, the mechanical environment and deformation characteristics of explosive charges in the process of warhead penetration are simulated. Then we propose a method for characterizing the anti-overload performance, which is the explosive charge ignition criterion $∫ σ ·$ dσ(σ and $σ ·$ are stress and stress rate respectively), and obtain a method for characterizing overload resistance of explosives. The device is used to test the anti-overload performance of three typical DNAN-based insensitive penetrating melt cast explosives, and obtain that their ignition thresholds are 1.8GPa^2/ms, 2.2GPa²/ms and 3.3GPa²/ms. Then, the flat-nosed projectile penetration test is employed to verify the anti-overload performance of the above three explosives. The results show that the anti-overload performance test and the flat-nosed projectile penetration test deliver consistent results, indicating that the test method and the device for the anti-overload performance of explosives are scientifically effective in selecting penetrating warhead charges.

Key words: DNAN explosives, anti-overload performance, stability of penetration, test device, ignition criterion

ZHOU Lin, NI Lei, LI Dongwei, ZHANG Xiangrong, LIU Haiqing, JIANG Tao, ZHU Yingzhong. Test Method for Anti-overload Performance of Explosives[J]. Acta Armamentarii, 2023, 44(6): 1722-1732.

Figures/Tables 19

Fig.1 Diagram of single-degree-of-freedom forced vibration model

Fig.2 System composition and structure concept diagram of penetration environment simulation test device

Fig.3 Drawing of assembly of main part of penetration environment simulation test device

Table 1 Peak stress value of the 3 groups of test charge grain under different experimental conditions

销钉直径/mm	气室初始压强/MPa	自由程/ mm	峰值压力/MPa	平均峰值压力/MPa	偏差/%
			741		1.93
6.0	0.5	252	724	727	0.41
			715		1.65
			952		1.06
8.0	0.9	240	940	942	0.21
			934		0.85
			1233		0.57
10.0	1.2	250	1244	1230	1.14
			1223		0.57

Fig.4 Comparison of stress-time curves of the 3 groups of test grain under different experimental conditions

Fig.5 Structure and geometry of the test piece

Table 2 Composition and content of explosive formulation

配方名称	组分及含量
RBUHL-1	DNAN 35%/RDX 15%/AP 15%/Al 25%/助剂10%
RBHL-1	DNAN 25%/RDX 36%/Al 31%/助剂8%
RBOL-1	DNAN 25%/HMX 36%/Al 31%/助剂8%

Table 3 Experimental conditions

序号	销钉直径/mm	自由程/mm	打击速度/(m·s^-1)
1	6.0	240	6.66
2	8.0	180	8.97
3	8.0	240	9.26
4	10.0	160	11.03
5	10.0	240	12.58

Fig.6 Measured stress-time curve of RBUHL-1 explosive sample by impact test

Fig.7 Photos of RBUHL-1 test piece recovery

Fig.8 Measured stress-time curve of RBHL-1 explosive sample by impact test

Fig.9 Photos of RBHL-1 test piece recovery

Fig.10 Measured stress-time curve of RBOL-1 explosive sample by impact test

Fig.11 Photos of RBOL-1 test piece recovery

Fig.12 Layout diagram of flat-nosed projectile test range

Fig.13 Structure diagram of flat-nosed test projectile

Fig.14 Photos of the site after the test with RBUHL-1 explosive flat-nosed projectile(left: target, right: recovered projectile)

Fig.15 Photos of thh site after the test with RBHL-1 explosive flat-nosed projectile (left: target, right: recovered projectile)

Fig.16 Photos of the site after the test with RBOL-1 explosive flat-nosed projectile (left: target, right: recovered bullet)

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