Theoretical Model of Oblique Penetration of Rigid Projectiles into Concrete Targets at Attack Angles

doi:10.12382/bgxb.2022.0423

Abstract

Abstract:

To facilitate the pre-estimation of the trajectory and attitude of rigid projectiles obliquely penetrating into concrete targets at attack angles, an theoretical model of rigid projectiles obliquely penetrating into concrete targets at attack angles is proposed to predicate the influence of attack angle on the motion state of projectiles. This paper offers a new method for calculating the projectile load at the cratering stage by its surface stress distribution, and subdivides the cratering stage into the entering stage of the projectile nose and the remaining stage after the full entry as it is considered that the attack angle has most obvious effects at the cratering stage. Moreover, the influence of free surface effect and contact area change on the stress of the projectile body is considered in the cratering model. Then the tunnel and shear plugging model in the theoretical model of attitude deflection is used to predict the whole process of a rigid projectile obliquely penetrating into a concrete target at an attack angle. The computational results of the motion state of the projectile under different penetration situations are proved to be in good agreement with the experimental data. Moreover, the results show that at an oblique angle, the positive attack angle will aggravate the deflection and reduce the penetration ability, while the negative attack angle will inhibit the deflection and the penetration ability can be improved when the negative attack angle is in the right range.

Key words: rigid projectile, attack angle, oblique penetration, perforation, concrete target

CLC Number:

O385

LIU Hongfu, HUANG Fenglei, BAI Zhiling, DUAN Zhuoping. Theoretical Model of Oblique Penetration of Rigid Projectiles into Concrete Targets at Attack Angles[J]. Acta Armamentarii, 2023, 44(8): 2381-2390.

Figures/Tables 17

References 21

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序号	弹径/ m	质心弹尖距离/m	弹长/ m	弹头长/m	弹重/ kg	弹头系数	转动惯量/ (kg·m²)
1	0.030	0.097	0.18	0.058	0.52	4.00	1.4×10^-3
2	0.360	0.743	1.48	0.426	500.00	1.69	76.1
3	0.064	0.179	0.32	0.106	5.04	3.00	3.7×10^-2
4	0.250	1.100	2.20	0.500	438.00	4.50	145.0

序号	弹径/ m	质心弹尖距离/m	弹长/ m	弹头长/m	弹重/ kg	弹头系数	转动惯量/ (kg·m²)
1	0.030	0.097	0.18	0.058	0.52	4.00	1.4×10^-3
2	0.360	0.743	1.48	0.426	500.00	1.69	76.1
3	0.064	0.179	0.32	0.106	5.04	3.00	3.7×10^-2
4	0.250	1.100	2.20	0.500	438.00	4.50	145.0

序号	厚度/m	密度/(kg·m^-3)	强度/MPa
1	0.10	2400	40.0
2	1.00	2400	40.0
3	0.42	2420	34.3
4	0.43	2420	34.3
5	1.50	2420	45.0

序号	厚度/m	密度/(kg·m^-3)	强度/MPa
1	0.10	2400	40.0
2	1.00	2400	40.0
3	0.42	2420	34.3
4	0.43	2420	34.3
5	1.50	2420	45.0

实验序号	弹体序号	靶体序号	弹体初始状态				靶厚分类	余速/(m·s^-1)			出靶姿态角/(°)
实验序号	弹体序号	靶体序号	初速/ (m·s^-1)	姿态角/ (°)	倾角/ (°)	攻角/ (°)	靶厚分类	实验值	计算值	相对偏差/%	实验值	计算值	相对偏差/%
1	1	1	705	14.41	15.11	-0.70	薄	624	590	5.4	13.67	13.6	0.5
2	1	1	515	28.54	29.57	-1.03	薄	428	350	18.2	26.74	30	12.2
3	1	1	694	28.28	29.8	-1.52	薄	576	579	0.5	26.63	29	8.9
4	2	2	256	30.8	25	5.8	中厚	73	67	8.2	41	39	4.9
5	3	3	407	15.9	15.9	0	厚	152	160	5.3	20.8	19.2	7.7
6	3	4	407	20.7	20.7	0	厚	168	141	16.1	32.06	26.6	16.8
7	4	5	227	0	0	0	厚	105	97	7.6	0	0	0