Influence of Spin on the Penetration Effect of Projectile

doi:10.12382/bgxb.2023.0864

Abstract

Abstract:

A projectile penetration model considering spin angular velocity is developed to explain the better performance of penetrating projectile with spin angular velocity in experiment and simulation. The effect of spin angular velocity on the projectile penetration behavior is revealed through theoretical research and simulation. The attitude dynamics analysis shows that the spin angular velocity causes the non-planar motion of projectile in general penetration cases, while the spinning projectile maintains planar motion only in ideal penetration. The derivation based on the cavity expansion theory indicates that the change in the direction of shear stress on the contact surface between projectile and target is one of the reasons for the decrease of penetration resistance. Together with the attenuation of normal stress on the cavity surface caused by shear effect, it forms the mechanism for the increase in penetration depth. The derivation of rigid body kinematics shows that the precession between targets leads to a slowdown or even decrease in the angle of fall, which is an important reason for the increase of ballistic stability in the case of multi-layered target penetration. Therefore, the spin angular velocity changes the force and motion mechanism of projectile throughout penetration, leading to the increase of its penetration depth and ballistic stability.

Key words: penetration, effect of spin, cavity expansion theory, multi-layered target, ballistic stability

CLC Number:

TJ301
TJ302

CHEN Baihan, WANG Libin, ZOU Huihui, WANG Weiguang, WANG Kehui. Influence of Spin on the Penetration Effect of Projectile[J]. Acta Armamentarii, 2023, 44(S1): 117-124.

Figures/Tables 5

Fig.1 Definition of body coordinates

Fig.2 Schematic diagram of the change in shear stress direction caused by spin angular velocity

Fig.3 Recession of friction versus penetration velocity, with spin angular velocity of 1000rad/s and different projectile radius

Fig.4 Evolution of angular velocity components at different spin angular velocities

Fig.5 Evolution of angle of fall at different spin angular velocities

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