Analysis of Loading Characteristics of Penetrating Warhead on Fuze in Wide Frequency Domain

doi:10.12382/bgxb.2023.0736

Abstract

Abstract:

A dynamic model and a finite element model of warhead are established to reveal the influence of warhead on the boundary load of fuse during penetrating. The transient loading characteristics of warhead on the fuze under the excitation of semi-sinusoidal signals with different frequencies are analyzed by using the finite element difference method and numerical simulation. The time-domain response characteristics of projectile and fuze under the impact of projectile on a target are studied through numerical simulation. Furthermore, the amplification factor of fuze overload response in the frequency domain is calculated by useing the shock response spectrum value. The results indicate that the penetrating warhead exhibits significant axial vibration amplification characteristics in a wide frequency range. The analyzed results of the overload frequency response characteristics and harmonic response of fuze indicate that the fundamental reason for the axial vibration amplification characteristics of penetrating warhead in a wide frequency range is the resonance of natural frequency of the first-order or multi-order axial vibration of warhead, which provides a basis for guiding the optimization design of high overload resistance of missile-borne products.

Key words: penetrating warhead, fuze, broadband domain, load characteristic

CLC Number:

O385

ZHAO Hui, CHENG Xiangli, LIU Jun, LIU Bo, WU Xuexing. Analysis of Loading Characteristics of Penetrating Warhead on Fuze in Wide Frequency Domain[J]. Acta Armamentarii, 2024, 45(10): 3696-3705.

Figures/Tables 24

Fig.1 Schematic diagram of penetrating warhead

Fig.2 Schematic diagram of 1D cylindrical rod subjected to impact load

Table 1 Parameters of warhead

类型	弹径/m	弹长/m	长径比	弹头系数
小型战斗部	0.18	1.05	5.83	2.2
大型战斗部	0.41	2.56	6.24	2.6

Fig.3 Transient acceleration of fuze

Fig.4 Transient acceleration peak value of fuze varying with loading frequency

Fig.5 Frequency spectrum for transient acceleration

Table 2 Material parameters for projectile simulation

组件	密度/(kg·m^-3)	弹性模量/GPa	泊松比
壳体	7750	210	0.31
主装药	1680	6.0	0.38
后端盖	4500	110	0.34
引信	4500	110	0.34

Fig.6 Finite element model of small-scaled warhead

Fig.7 Transient acceleration of fuze

Fig.8 Transient acceleration peak value of fuze varying with loading frequency

Fig.9 Frequency spectrum for transient acceleration of warhead

Fig.10 Finite element model of projectile and target

Table 3 Main parameters ofwarhead model

材料	密度/ (g·cm^-3)	屈服强度/ MPa	泊松比	弹性模量/ GPa
弹体	7.85	1590	0.28	210
装药	1.84	16.2	0.38	3.05
后端盖	4.50	825	0.34	110
引信	4.50	825	0.34	110

Table 4 HJC model parameters of concrete

参数	数值	参数	数值
ρ/(kg·m^-3)	2440	SF_max	7
G/GPa	14.86	p_c/GPa	0.016
A	0.79	μ_c	0.001
B	1.6	p_L/GPa	0.8
C	0.007	μ_L	0.1
N	0.61	D₁	0.04
f_c/GPa	0.048	D₂	1
T/GPa	0.004	K₁/GPa	85
EP_s0/s^-1	1	K₂/GPa	-171
EF_min	0.01	K₃/GPa	208

Fig.11 Acceleration of small-scaled warhead and fuze

Fig.12 Acceleration of full-scaled warhead and fuze

Table 5 Acceleration peak value and magnification

战斗部	靶标	过载峰值/10⁴g		放大倍数
战斗部	靶标	弹体	引信	放大倍数
小型战斗部	2.5m厚靶	2.06	4.16	2.02
	5层建筑楼板	1.22	3.4	2.78
大型战斗部	2.5m厚靶	0.61	1.38	2.26
	5层建筑楼板	0.59	2.33	3.95

Fig.13 Frequency spectrum analysis of fuze acceleration

Fig.14 Shock response spectrum of fuze simulation acceleration

Fig.15 Harmonic response analysis result of warhead

Table 6 Frequency spectrum energy concentrated band of fuze accelerationHz

计算类型	大型战斗部	小型战斗部
谐响应分析	970	2400
瞬态响应理论计算	1000	2400
瞬态响应仿真分析	1000	2400
弹靶作用响应分析	1000	2462

Fig.16 Layout of target

Fig.17 Frequency spectrum of measured fuze acceleration

Fig.18 Shock response spectrum of measured fuze acceleration

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