Abstract
Ballistic gelatin is a widely used tissue simulant in terminal ballistics. To investigate the yawing motion of rifle bullets in gelatin, this paper presented a simplified 2-DOF motion model describing the translation and rotation of the bullets. Penetration experiments were conducted using rifle bullets of two different calibers. By comparing with the experimental results, the parameters in the present yawing motion model were estimated and analyzed. The present model can predict the yawing motion of the two rifle bullets in gelatin with much higher accuracy than previous models. The yawing motion of rifle bullets was discussed in detail by making comparisons between calculations of two different rifle bullets and comparisons between calculations with different initial conditions. The striking yaw angle was found to play a decisive role in the growth of the yaw angle and thus to noticeably affect the penetration depth when the bullet tumbles through 90°.
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