Dynamic Damage Characteristics of Composite Concrete Structure Subjected to Reactive Jet

doi:10.12382/bgxb.2024.0630

Abstract

Abstract:

The dynamic damage characteristics of composite concrete structure under the combined action of reactive jet penetration and explosion are studied. A method combining full-scale damage experiment and kinetic-chemical energy segmented numerical simulation is used to obtain the dynamic damage characteristics of composite concrete structures with different surface layer thicknesses under the action of reactive jet. The findings reveal various damage modes, including central penetration holes, collapse, bulge, and radial/circumferential cracks, in the concrete layers under the combined action of PTFE/Al jet penetration and explosion. As the thickness of the concrete layer increases, the spalling area increases, while the height of bulge and the number of radial cracks decrease. Utilizing finite element analysis software, in conjunction with the reactive characteristics of the jet and a modified-RHT concrete model capable of simulating concrete tensile failure, the study employed the FEM-SPH algorithm and restart approach for segmented numerical simulation of damage behavior, resulting in damage effect diagrams to further analyze the mechanisms behind damage discrepancies. The spatial distribution characteristics of the reactive jetare pesented by combining experimental and numerical results, establishing the relationship between kinetic penetration damage and explosion-enhanced damage. The numerically simulated results are in good agreement with the experimental results. The results show that, on the basis of kinetic energy damage, the diameters of penetrating hole and damaged areaare increased by 116% and 59.7%, respectively, under the action of explosion enhanced; damage of reactive jet.

Key words: composite concrete structure, reactive jet, penetration behavior, explosion enhancement, damage effect

CLC Number:

TJ410.4

SU Chenghai, WANG Zhong, MA Hongbing, ZHENG Yuanfeng, WANG Haifu. Dynamic Damage Characteristics of Composite Concrete Structure Subjected to Reactive Jet[J]. Acta Armamentarii, 2024, 45(S1): 135-146.

Figures/Tables 24

Fig.1 Composite concrete structure

Table 1 Compressive strength and flexural strength tests of concrete layer

编号	抗压破坏载荷/kN	测试抗压强度/MPa	平均抗折强度/MPa	抗折破坏载荷/kN	测试抗折强度/MPa	平均抗折强度/MPa
1	1075.2	47.8		38.6	5.1
2	1050.1	46.7	47.3	38.2	5.1	5.1
3	1065.5	47.4		38.2	5.1

Fig.2 Scanning results of the microstructure of the reactive liner

Table 2 EDS surface scan elemental analyzed results

元素	质量百分比/%	原子百分比/%
C	24.02	35.48
O	1.32	1.46
F	59.30	55.37
Al	11.12	7.31
Au	4.25	0.38

Fig.3 Structure of reactive liner shaped charge

Fig.4 Experimental principle and setup

Fig.5 High-speed photography the damage of reactive jetsto composite concrete structures

Fig.6 Dynamic damage results of Hc=250mm composite concrete structure subjected to reactive jet

Fig.7 Dynamic damage results of composite concrete structures with different thicknesses

Fig.8 Comparison of composite concrete damages affected by Al jet and reactive jet

Table 3 Comparison of dynamic damage results of composite concrete structures

实验编号	H_c/cm	D_p/cm	D_c/cm	δ_b/cm	L	环向裂纹直径/cm
活性射流-1	250	37	87×75	6	8	330
活性射流-2	350	30	97×105	3	7
活性射流-3	450	26	198×160	0	4
铝射流	450	14.7	66×83	0	3

Fig.9 High-speed photography of the damage of Al jet to composite concrete structures

Table 4 Concrete material parameters

参数	数值	参数	数值
剪切模量/GPa	16.3	弹性强度/f_t	0.7
抗压强度f_c/MPa	47.3	弹性强度/f_c	0.53
抗拉强度f_t/f_c	0.108	残余强度常数B₀	1.8
剪切强度f_s/f_c	0.11	残余强度exp.M	0.7
破坏面参数A₀	2	比较应变率exp.α	0.032
破坏面参数N	0.7	损伤常数DI	0.04
拉压子午比	0.6805	最小失效应变	0.01
脆性到延性转变	0.0105	残余热模量	0.13
G(弹性)/G(弹-塑性)	2	侵蚀应变几何应变(仅适用于拉格朗日)	2

Table 5 Material parameters of inert PTFE/Al, steel and aluminum

材料	密度/(g·cm^-3)	G/GPa	A₁/MPa	B₁/MPa	n	C₁	m	T_melt/K	C_a/(km·s^-1)	S₁	Γ
钢	7.83	77	507	320	0.28	0.064	1.06	1793	4.57	1.92	2.17
PTFE/Al	2.27	0.666	8.044	250.6	1.8	0.4	1.0	500	1.45	2.2584	0.9
铝	2.74	22.7	250	225	0.37	0.067	1.0	775	5.33	1.34	2.0

Table 6 Material parameters of 8701 explosive and PTFE/Al after reactivation

材料	密度/(g·cm^-3)	D/(km·s^-1)	P_cj/GPa	A₂/GPa	B₂/GPa	R₁	R₂	ω
PTFE/Al	2.27	5.2	21	15.9	0.0023	7	0.6	0.38
8701炸药	1.71	8.315	28.6	524.23	7.678	4.2	1.1	0.34

Fig.10 Numerical simulation model

Fig.11 Dynamic response mechanism of composite concrete structure under jet penetration

Fig.12 Damage results of composite concrete structure under reactive jet penetration

Fig.13 Variation of penetration depth over time

Fig.14 Spatial distribution of reactive jet at τ

Table 7 Spatial distribution of mass fractions of reactive materials

H_c	活性材料初始质量/g	剩余质量/g	空气层中质量分数/%	混凝土层质量分数/%	碎石层质量分数/%
250mm		956.5	20.7	37.9	41.4
350mm	1057	964.0	31	54.5	14.5
450mm		983.0	37.8	62.2	0

Fig.15 Numerically simulated results of explosion-enhanced damage

Fig.16 Comparison of numerically simulated and experimental results

Fig.17 Comparison of damages from reactive jet penetration and explosion enhancement

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