研究梯形截面杀伤战斗部预制破片飞散特性规律,为梯形截面杀伤战斗部的设计提供参考。运用ANSYS/LS-DYNA软件建立了5种不同形状梯形截面杀伤战斗部模型,并进行了爆炸驱动预制破片的数值模拟,得到了破片分布规律、梯形面上破片飞散速度、不同起爆点破片的飞散特性。结果表明: 4个梯形面上的破片形成了4个破片束,下面破片飞散角最大,可达105°,梯形斜面上的破片飞散方向相对于斜面法向朝梯形下方偏转,最大偏转34.5°。θ为60°之前,梯形面上的破片平均速度随着θ的增大提高了8.6%,梯形下面破片平均速度大于梯形上面。θ过大会降低梯形下面和斜面上破片平均速度。梯形斜面上最大速度破片位于斜面上部。梯形对称轴上不同位置的起爆点对梯形面上破片周向飞散角和斜面破片偏转角影响不大,但是可以提高对侧方向破片飞散速度,下面破片增幅达3.7%。θ为45°、起爆点设置在梯形上面可使下面破片获得最大的杀伤威力。

In order to obtain the flying characteristics of prefabricated fragments of trapezoidal section lethal warhead and provide reference for the design of trapezoidal section lethal warhead, the numerical simulation of prefabricated fragments driven by five kinds of trapezoidal section charge explosion was carried out by ANSYS/LS-DYNA software.The distribution law of fragments,the velocity of fragments on each trapezoid surface and the characteristics of fragments at different initiation points were obtained. The results show that the fragments on the four faces of trapezoid form four fragment bundles. The lower fragment flying angle is the largest, up to 105°.The fragmentation direction on the trapezoidal inclined plane is deflected under the trapezoidal relative to the normal direction of the inclined plane.The maximum deflection angle is 34.5°.When angle θ is smaller than 60°, the average fragment velocity on each surface of trapezoid increases by 8.6%.And the average velocity of fragments on the lower surface of trapezoid is greater than that on the upper surface of trapezoid. A large angle θ will decrease the average velocity of the fragment on the lower surface and the inclined surface of the trapezoid. The maximum velocity fragment is located on the upper part of the trapezoidal inclined plane. The initiation points at different positions on the trapezoidal symmetry axis have little effect on the circumferential scattering angle of fragments on each trapezoidal plane and the deflection angle of fragments on the inclined plane, but can increase the velocity of fragments in the contralateral direction,the fragment on the lower surface increased by 3.6%.The angle θ is 45° and the initiation point is set on the trapezoid, which can make the following fragments obtain the maximum killing power.