High-Speed Impact Engraving Characteristics of Cased Telescoped Ammunition

doi:10.2382/bgxb.2022.0834

Abstract

Abstract:

To study the mechanical mechanism and motion law of the high speed impact engraving process of cased telescoped ammunition, the physical and mathematical interior ballistic models were analyzed and established with a 40mm caliber CTA gun as the research object, and the interior ballistic model was verified by live fire experiments. Considering the friction and contact characteristics between the interfaces, a high-speed impact engraving model was built by the FEM-SPH coupling algorithm, and the numerical solution of the interior ballistics was used as the boundary condition to obtain the change laws of the deformation of the rotating band, projectile motion, projectile attitude and engraving resistance by numerical calculations. The results showed that: the established ballistic model is accurate and reasonable; the initial velocity of the projectile at the bore was 78.2m/s; the entire engraving process can be divided into the decelerating and accelerating phases, and the projectile was in the quasi-static state between the two phases; during the decelerating engraving process, the projectile attitude changed periodically, and the amplitude of the oscillation angle decreased continuously; the oscillation angle increased rapidly during the accelerating engraving process; as the engraving was completed, the oscillation angle showed a decreasing trend; the engraving time was 2.65 ms and the projectile velocity was 73.92 m/s at the completion of engraving; the surface temperature of the rotating band during the engraving process was close to the melting point of the material; there were two "rise - fall" processes in the dynamic engraving resistance with the maximum engraving resistance of 95.288 kN, and the resistance decreased and stabilized at 10 kN at the moment of fully engraving.

Key words: cased telescoped ammunition, interior ballistic, impact engraving, FEM-SPH coupling algorithm, projectile attitude, engraving resistance

SHI Junfei, QIAN Linfang, CHEN Hongbin, FU Jiawei. High-Speed Impact Engraving Characteristics of Cased Telescoped Ammunition[J]. Acta Armamentarii, 2023, 44(3): 656-669.

Figures/Tables 24

Fig. 1 Physical model of interior ballistics of the CTA gun

Table 1 Charge parameters of CTA

参数	数值	参数	数值
ω_b/g	1.5	u_1b	4×10^-8
ω_z/g	375	u_1z	1.8×10^-8
ω_c/g	58	u_1c	2×10^-8
n_b	0.82	ρ_b/(kg•m^-3)	1 600
n_z	0.82	ρ_z/(kg•m^-3)	1 600
n_c	1	ρ_c/(kg•m^-3)	850
f_b/(kJ•kg^-1)	1 000 000	α_b/(m³•kg^-1)	0.001
f_z/(kJ•kg^-1)	1 150 000	α_z/(m³•kg^-1)	0.001
f_c/(kJ•kg^-1)	700 000	α_c/(m³•kg^-1)	0.000 825
V_0b/m³	6.9×10^-6	V₀/m³	7.5×10^-4
S₁/m²	1.36×10^-3	S₂/m²	1.27×10^-3
l_k/m	0.172	l_g/m	2.98
p_bs/MPa	2.5	p_bd/MPa	8
φ₁	1.005	φ₂	1.05
m/kg	1	θ	0.25

Fig. 2 Diagram of the numerical solution procedures of interior ballistics

Fig. 3 Comparison of the numerical results of the average bore pressure with the conversion results of the measured values

Fig. 4 Velocity-time and displacement-time curves of the projectile

Fig. 5 Schematic diagram of projectile attitude

Fig. 6 Schematic diagram of the shape of and force on the rotating band during the engraving process

Fig. 7 Schematic diagram of the high-speed impact engraving process

Fig. 8 Finite element meshes of the engraving system

Fig. 9 Coupling diagram of SPH particles and Lagrange grids

Fig. 10 Meshes and SPH particles of the rotating band

Table 2 Material parameters of the rotating band

参数	数值	参数	数值
A/MPa	90	D₁	0.54
B/MPa	292	D₂	4.89
n	0.42	D₃	-3.03
C	0.01	D₄	0.014
m	1.68	D₅	1.12
T_r/K	294	T_m/K	1356

Fig. 11 SPH-FEM coupling contact algorithm

Fig. 12 Plastic deformation process of the rotating band

Fig. 13 Comparison of the shape of the rotating band obtained from the test and simulation

Fig. 14 SPH particles in typical parts of the rotating band

Fig. 15 Temperature of typical parts of the rotating band surface

Fig. 16 Equivalent stress of typical parts of the rotating band surface

Fig. 17 Velocity-time curve of engraving

Fig. 18 Acceleration-time curve of engraving

Fig. 19 Energy variation during the engraving process

Fig. 20 Lateral and longitudinal osllication angles of the projectile

Fig. 21 Angular velocity of transverse and longitudinal oscillation of the projectile

Fig. 22 Resistance variation law of dynamic engraving resistance

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