Penetration-deflagration Experiment and Coupling Mechanism of Reactive Liner Shaped Charge

doi:10.12382/bgxb.2021.0645

Abstract

Abstract:

To investigate the penetration-deflagration behaviors and coupling mechanism of fluoropolymers based reactive liner shaped charge against steel target, the damage experiment of 73.5% PTFE (Polytetrafluoroethylene)/26.5% Al reactive liner shaped charge impacting the steel target is carried out, and the effects of stand-off on the penetration depth, penetration aperture, and burst behaviors of the steel target are obtained. The results show that the coupling damage effect of penetration and burst of reactive liner shaped charge on the steel target is most significant when the stand-off is in the range of 0.35CD~1.00CD. On this basis, combining the theory of quasi-steady incompressible fluid mechanics, a function between the penetration depth and reaction delay of the reactive jet is given by introducing the reaction delay, and the effective mass model of the reactive jet inside the penetration hole is further developed. Based on the modified Bernoulli equation, combining the interior explosion characteristics of the reactive jet, a theoretical model for the reactive jet's penetration aperture diameter is developed. Using the cylinder failure theory, a method for judging the burst behaviors of a steel target under the coupling damage effect of penetration and burst of the reactive jet is proposed. The theoretical model quantitatively describes the coupling damage the reactive jet causes to the steel target and reveals the mechanism for the expansion of the hole and burst of the steel target caused by overpressure after the armor penetration is terminated.

Key words: reactive materials, reactive liner, penetration, deflagration, damage model

CLC Number:

TJ410.4

SU Chenghai, LI Zongyu, ZHENG Yuanfeng, ZHENG Zhijian, GUO Huanguo. Penetration-deflagration Experiment and Coupling Mechanism of Reactive Liner Shaped Charge[J]. Acta Armamentarii, 2023, 44(2): 334-344.

Figures/Tables 18

Fig.1 Sintering curve of reactive liner samples

Fig.2 Reactive liner sample

Fig.3 SEM microstructure of PTFE/Al reactive liner

Table 1 Comparison between mechanical parameters of the reactive material and copper

材料	密度/ (g·cm^-3)	屈服强度/MPa	弹性模量/GPa	抗拉强度/MPa	延伸率/ %
PTFE/Al	2.27	12.65	1.29	19.2	37
紫铜^[10]	8.9	90	127	209	60

Fig.4 Reactive liner shaped charge structure

Fig.5 Experimental principle and setup

Fig.6 Experimental results of damage effectscaused by the reactive liner shaped charge to the steel target

Fig.7 Section view of damage effects

Table 2 Experimental results regarding damage effects

序号	炸高	侵彻深度/ mm	顶部孔径 D_t/mm	底部孔径 D_b/mm	裂纹
1	23mm(0.35CD)	51	68	24	4条裂纹 (3大1小)
2	33mm(0.5CD)	52	60	21	3条裂纹,钢靶几乎裂成两半
3	66mm(1.0CD)	48	55	23	4条裂纹 (3大1小)
4	99mm(1.5CD)	50	39	20	无
5	132mm(2.0CD)	30	43	18	无

Fig.8 Schematic diagram of the damage effects

Fig.9 Theoretical model for the reactive jet penetrating the steel target

Fig.10 Residual mass model of the reactive jet penetrating the steel target

Fig.11 Relationship between penetration depth and time under different stand-offs

Fig.12 Relationship between meff and penetration depth under different stand-offs

Table 3 Parameters of the reactive jet when reaching the target

射流参数	0.35CD	0.5CD	1.0CD	1.5CD
头部直径/mm	9.8	9.2	8.6	7.8
头部速度/(m·s^-1)	7100	6889	6805	6770
杵体直径/mm	17.2	19.2	18.4	18
杵体速度/(m·s^-1)	516	562	511	490
侵彻体长度/mm	73	81	111	142

Table 4 Calculation of the penetration hole diameter and ultimate fracture strength under different stand-offs

参数	0.35CD	0.5CD	1.0CD	1.5CD
顶部孔径D_t理论值/mm	61.9	53.5	48.4	42.8
侵孔底部孔径D_b理论值/mm	18.8	20.5	22.0	17.8
侵孔平均直径计算值/mm	40.4	37.0	35.2	30.3
碎裂强度极限计算值/MPa	91.1	93.0	93.9	96.1
侵孔内爆压力计算值/MPa	131.8	124.4	98.2	85.1
是否碎裂	是	是	是	否

Fig.13 Comparison of experimental and calculated results regarding hole diameter

Fig.14 Average perforation diameter

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