高速碰撞下弹坑的成坑规律研究

利用爆炸加速器将球形ＧＣｒ１５粒子加速到２．６－７ｋｍ／ｓ撞击ＬＹ１２－Ｍ、ＬＦ６、ＴＡ６、３０ＣｒＭｎＳｉＡ－Ｔ靶材，研究了四种靶材在高速碰撞下弹坑的成坑规律，结果表明，弹丸平均动能密度一定时，弹坑深度与弹丸直径呈线性关系：在４ｋｍ／ｓ〈ｖ０〈５ｋｍ／ｓ时，四种半无限体靶上形成的弹坑深度和直径弹ｖ０增大而减小，在其它速度范围内，弹坑深度和直径随ｖ０增大而增大；在２．６ｋｍ／ｓ〈ｖ０〈７ｋｍ／ｓｊ

Formation of Craters By Hypervelocity Impact

Tacits made of LY12-M, LF6, TA6, 30CrMnSiA-T alloys were impacted by GCr15 steel projectiles which had been accelerated to velocities of 2. 6~7km/s by an explosive accelerator and the formation of craters in the these four materials has been studied. The results show that the depth of craters changes linearly with the Projectile diameter when the average energy density of projectiles is a constant; In the impact velocity range of 4km/s < v0 < 5km/s, the depth and diameter of craters formed in the four targets decrease with increasing the impact velocity, and in other conditions, the depth and diameter of craters increase with v0; when 2. 6km/s < v0 < 7km/s, the crater shape coefficient Pc/Dc in targets made of aluminum alloys decreases with the increase of v0, while its value is still larger than 0. 5, and the crater shape changes gradually from a cylinder with a hemishperical bottom to a hendspherical cylinder. The crater shape coefficient Pc/Dc in targets made of steels or titanium alloys is always equals to about 0.5, and the crater always shows a hemispherical shape; the crater volume shows a linearly function with the projectile energy; the largest thickness for aluminum targets that can be penetrated by penetrated by projectiles is 2Pc, while that for steel targets is 4Pc.