Abstract: The current standard military bullets have excessive penetration power at close range. After abullet cuts through the body, its remaining energy can cause a highly lethal effect, which is unable tomeet the combat requirements of counter-terrorism and anti-hijacking. So there is an urgent need to develop the non-penetration and highly lethal technology for rifle bullets. A rolling motion model of bullet inthe muscles is established and the centrifugal fragmentation mechanism of bullet is revealed by analyzingthe basic control principle of penetration depth. The numerical simulation is used to discuss the main factors which affect the rolling and fragmentation of bullet. The rolling and fragmentation process of non-penetrating rifle bullet in gelatin target is revealed by experiment. The research results show that the centrifugal force generated by rolling bullet can make the soft bullet crushed, and the center-of-mass position ofbullet is a sensitive factor to affect the rolling of bullet. The rolling state of bullet can be controlled by adjusting the center-of-mass position of bullet, and compared with the standard rifle bullet, the penetrationdepth of new bullet can be reduced to 1/2 to reach the non-penetration and highly lethal effect by improving the bullet velocity and reducing the thickness and strength of bullet shell.

Key words: ordnance science and technology, rifle ammunition, instability rolling, centrifugal force, fragmentation, non-penetration