椭球弹丸超高速撞击防护屏碎片云数值模拟

低地球轨道的各类航天器易受到微流星体及空间碎片的超高速撞击.本文采用AUTODYN软件进行了椭球弹丸超高速正撞击及斜撞击防护屏碎片云的数值模拟.给出了三维模拟的结果.研究了在相同质量的条件下,不同长径比椭球弹丸以不同速度和入射角撞击防护屏所产生碎片云的特性,并与球形弹丸撞击所应产生的碎片云特性进行了比较.结果表明:在相同的速度下,不同长径比椭球弹丸撞击的碎片云形状、质量分布和破碎程度是不同的,随撞击入射角的增加弹丸的破碎程度增大,滑弹碎片云的数量增加;随撞击速度的增加,弹丸的破碎程度也增加.

Numerical simulation of debris cloud produced by ellipsoidal projectile hypervelocity impact on bumper

All spacecraft in low orbit are subject to hypervelocity impacts by meteoroids and space debris. The numerical simulations of debris cloud produced by ellipsoidal projectile hypervelocity impact on bumper at normal and oblique angles have been carried out using the AUTODYN hydro-codes in this paper. The results using three-dimensional simulations are given. The characteristics of debris cloud produced by ellipsoidal projectile with the mass kept constant and different aspect ratios hypervelocity impact on bumper have been investigated with variations of the impact velocity and the impact incidence angle. The simulation results are compared with the characteristic of debris cloud created by spherical projectiles. It is shown that the debris cloud shapes, mass distribution and fragmentation degree are different with various aspect ratios ellipsoidal projectile impact, the fragmentation and the quantity of ricochet debris cloud is increased as the increase of impact incidence angle at the constant velocity; the fragment of projectile is increased as the impact velocity increase.