高速粒子撞击作用下LF6合金多层靶结构防护能力研究

Protection capability of LF6 alloy multi-layer target structure against hypervelocity projectile impact

针对总厚度为 4mm的LF6合金双层靶和总厚度为 2mm的三层靶进行了直径为 2mm ,速度分别为5 .8和 7.2km/s的GCr15粒子撞击试验 ,并对双层靶进行了不同前靶厚度和靶间距的撞击试验 .试验结果表明 :与同样碰撞条件下半无限体靶上产生的破坏情况相比 ,多层靶被击穿的总厚度远小于半无限体靶上形成的弹坑深度 .采用多层靶结构可显著提高材料的抗高速粒子撞击能力 ,并大大降低航天器抗高速粒子撞击的防护结构的重量 .结构的层数越多 ,防护性能越好 .在满足防高速粒子击穿的条件下 ,为减小航天器多层防护结构的体积 ,靶间距一般可取为粒子直径的 2 5倍左右 .

Describes the impact experiments of dual layer and triple layer target structures run with projectiles of 2 mm in diameter and velocities of 5.8 and 7.2 km/s and the investigation of cratering during hypervelocity impact for the dual layer target structure and concludes that the total punctured depth was less in the multi layer targets by hypervelocity projectile impact in comparison with the crater depth on semi infinite targets under the same impact condition and multi layer target structure achieves a higher protection efficiency as well as weight savings of the protection structure, and the more the layers, the better the protection efficiency, and for the purpose of preventing spacecraft from puncturing by hypervelocity projectile impact the distance between the front and the back target is chosen to be about 25 times the projectile diameter to decrease volume of the multi layer target protection structure.