An Equivalent Simulation Test System for Complex Terminal Ballistics of Fuze Based on Counter Target Method

doi:10.12382/bgxb.2023.0985

Abstract

Abstract:

In response to the increasing demand for high initiation reliability of fuze under complex terminal ballistic in mobile warfare, an equivalent simulation test system for complex terminal ballistic of fuze based on the counter target method is studied to address the issues of limited incident angle, non-real-time acquisition of initiation signals, and high testing cycle/cost in current forward shooting tests. The similarities of axial impact characteristics of key modules in 30 mm small caliber projectile fuze are compared through finite element simulation. A theoretical model of the impact characteristics of a cylindrical target plate reverse impact fuze is established based on elastic-plastic mechanics. The theoretical model is numerically solved using a micro surface force method and verified through comparison of simulated results. An equivalent simulation test system model is built based on a 20mm light gas gun, and the response characteristics of two trigger switches are collected in real-time and studied. The experimental results show that the response time of a trigger switch for small caliber projectile fuze when forwardly impacting on a 2mm aluminum alloy target plate is approximately 58.2μs. The feasibility of the equivalent simulation test system based on the counter target method is verified by comparing the calculated results of the forward shooting test fuze hitting a 2mm aluminum alloy target plate and causing a “surface explosion”.

Key words: equivalent simulation test system, counter target method, fuze, terminal ballistics, test method

CLC Number:

TJ01

LOU Wenzhong, HE Bo, YUAN Yong, LI Zhipeng, SHAN Liang, FENG Hengzhen, ZHANG Mingrong, ZHU Haokun. An Equivalent Simulation Test System for Complex Terminal Ballistics of Fuze Based on Counter Target Method[J]. Acta Armamentarii, 2024, 45(12): 4554-4564.

Figures/Tables 20

Fig.1 FE model of 30mm projectile and modular fuze

Table 1 Composition of simulation model and key material parameters

模型组成	材料	弹性模量/GPa	密度/ (kg·m^-3)	泊松比
引信体	铝合金	69.35	2810.0	0.33
灌封材料	环氧树脂	3.39	1850.0	0.36
起爆模块	铝合金	69.35	2810.0	0.33
电源模块	铝合金	69.35	2810.0	0.33
安全系统	铝合金	69.35	2810.0	0.33
压螺	铝合金	69.35	2810.0	0.33
传爆管	铝合金	69.35	2810.0	0.33
战斗部装药	炸药柱	9.0	1740.0	0.30
战斗部壳体	45号钢	206.84	7833.4	0.29

Fig.2 Axial impact overloads applied to the detonating control module of fuze under different conditions

Fig.3 Counter target simulation model

Fig.4 Axial impact overload applied to the fuze at a impact velocity of 300m/s

Fig.5 Axial impact overload applied to the sensitive components under different impact velocities

Fig.6 Schematic diagram of the impact excitation of fuze under the reverse target method

Fig.7 30mm projectile fuze head model

Fig.8 Fuze head surface grid

Fig.9 Normal vector of infinitesimal

Fig.10 Residual velocity of target at different impact velocities

Fig.11 Fuze axial overload at different impact velocities

Table 2 Comparison of the amplitudes of impact overloads on sensitive components

碰撞速度/ (m·s^-1)	a_f/ g	t_f/ μs	a_{s_t}/ g	a_{s_s}/ g	误差/ %
200	19150.2	7.2	97072.3	102000	4.8
300	26488.4	5.8	163114.2	179000	8.9
400	29412.2	4.4	220027.7	278000	20.9

Fig.12 Counter target method test system

Fig.13 Equivalent fuze carrier and internal trigger switch

Fig.14 Electrical connection relationship

Table 3 Test conditions

工况	触发开关	靶板材料	靶板质量/g	等效引信载体质量/g	靶板速度/ (m·s^-1)
1	1	硬橡胶	11.0	26.1	293
2	2		10.81	26.1	300

Fig.15 High-speed photography of dynamic process of target impacting on fuze

Fig.16 Key signals collected by oscilloscope

Fig.17 Different morphologies of forward shooting test target plates

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