射弹冲击下带预裂槽金属靶的防护性能研究

童宗保; 王金相; 梁丽; 钱吉胜; 唐奎

doi:10.11858/gywlxb.2017.02.002

Resistance Performance of Grooved Metal Target Subjected to Projectile Impact

doi: 10.11858/gywlxb.2017.02.002

1.
Science and Technology on Transient Physics Laboratory, Nanjing University of Science and Technology, Nanjing 210094, China
2.
Jiangnan Industries Group Co.LTD, Xiangtan 411207, China
3.
Jinxi Industries Group Co.LTD, Taiyuan 030027, China

Funds:

National Natural Science Foundation of China 11272158

National Natural Science Foundation of China 11672138

Foundation of Science and Technology on Transient Physics Laboratory 9140C300405150C30005

More Information

Author Bio:
TONG Zong-Bao(1988—), male, assistant engineer, major in warhead design.E-mail:asnyxun@163.com

Corresponding author: WANG Jin-Xiang(1978—), male, doctor, professor, major in explosion and impact dynamics.E-mail:wjx@njust.edu.cn

摘要

摘要: 采用弹道实验和数值模拟的方法研究了带环形预裂槽的金属靶在射弹冲击下的毁伤模式和防护性能，分析了弹头形状、预裂槽直径及深度等因素对靶板防护性能的影响。结果表明：对带有环形预裂槽的金属靶板，存在两种主要毁伤模式，即环形槽内部的侵彻和环形槽底的冲击断裂；临界毁伤速度与毁伤模式密切相关，随着环形槽深度的增大或半径的变小，临界毁伤速度变小；与尖头弹相比，平头弹的临界毁伤速度更小；微观分析表明，在射弹冲击作用下，环形槽底部产生绝热剪切带，更容易形成充塞剪切破坏。
- 刻槽金属靶 /
- 防护性能 /
- 弹头形状 /
- 毁伤模式 /
- 绝热剪切带
Abstract: The damage modes and resistance performance of the annular pre-cut metal target impacted by the projectile were studied by experiments and numerical simulation.Influences of the projectile nose shape, the diameter as well as the depth of the annular groove on the resistance performance of the target were analyzed.The results show that there exist two kinds of damage modes for the target with an annular groove, one being the penetration of the inner part of the groove and the other the fracture along the bottom of the annular groove.The critical damage velocity (CDV) is closely related to the damage modes of the target.Generally, the grooved target was easier to be damaged than the intact one.The CDV decreases with the increase of the annular groove depth while it goes up with the increase of the annular groove diameter.Compared with the oval nose projectile, the CDV of the target is smaller for the flat nose projectile.The microscopic analysis shows that when the adiabatic shear band is formed inside the target, the plug is easier to be formed and the target is easier to be damaged.
- grooved metal target /
- resistance performance /
- projectile nose shape /
- damage modes /
- adiabatic shear band

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Figure 1. Schematics of tandem warhead and target

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Figure 2. Schematic and photo of experimental setup

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Figure 3. Projectile size and grooved steel target

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Figure 4. FEM calculation model(1/2)

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Figure 5. Comparison of experimental and numerical results

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Figure 6. Results of numerical simulation about CDV under different conditions

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Figure 7. Typical experimental results of targets for different incidence velocities of projectile

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Figure 8. Typical damage modes of pre-split targets (experimental results)

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Figure 9. Numerical simulation of stress distribution

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Figure 10. Microstructure analysis of damage zone near plug edge

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Table 1. Various experimental conditions

Projectile	D/(mm)	L/(mm)	Projectile	D/(mm)	L/(mm)
Oval projectile	15	4.0 5.5 7.0	Oval projectile	30	4.0 5.5 7.0
Oval projectile	20	4.0 5.5 7.0	Flat nose projectile	20	4.0 5.5 7.0

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Table 2. Material model parameters of projectile (304L steel) and target (45 steel)^[16-17]

Material	A/ (MPa)	B/ (MPa)	N	C	M	D₁	D₂	D₃	D₄	D₅
304L steel	792	510	0.260	0.014	1.03	-0.8	2.10	-0.50	0.002	0.61
45 steel	507	320	0.064	0.280	1.06	0.1	0.76	1.57	0.085	-0.84

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Table 3. Equation of state parameters of projectile (304L steel) and target (45 steel)^[16-17]

Material	ρ₀/(g/cm³)	S₁/(MPa)	S₂/(MPa)	S₃/(MPa)	γ₀	a
304L steel	7.83	164	294	500	1.16	0.46
45 steel	7.81	153	271	483	1.12	0.44

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Table 4. Numerical simulation results of damage modes and CDV

Projectile	D/(mm)	L/(mm)	v₀/(m/s)	Damage mode
Oval projectile	∞	0	624	Penetrate
	15	4.0 5.5 7.0	438 352 225	Penetrate Penetrate Fracture
	20	4.0 5.5 7.0	516 409 288	Penetrate Fracture Fracture
	30	4.0 5.5 7.0	543 502 356	Penetrate Penetrate Fracture
Flat nose projectile	20	4.0 5.5 7.0	386 377 358	Penetrate Fracture Fracture

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Table 5. Experimental results

Projectile	D/(mm)	L/(mm)	Mass/(g)	v/(m/s)	Damage model
Oval projectile	15	4.0 5.5 5.5 7.0 7.0	9.65 9.65 9.65 9.65 9.65	396.0 378.0 305.0 260.0 174.5	No penetrate Fracture No fracture Fracture No fracture
	20	4.0 4.0 5.5 5.5	9.65 9.65 9.65 9.65	390.6 535.0 523.0 341.0	No penetrate Penetrate Fracture No fracture
	30	4.0 4.0 5.5 7.0 7.0	9.65 9.65 9.65 9.65 9.65	558.0 471.7 492.0 341.0 374.0	Penetrate No penetrate Penetrate No fracture Critical fracture
Flat nose projectile	20	4.0 5.5 7.0	7.81 7.81 7.81	374.0 375.0 363.0	No fracture Critical fracture Fracture

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