Penetration and cratering experiments of graphite by 0.5-mm diameter steel spheres at various impact velocities
Penetration and cratering experiments of graphite by 0.5-mm diameter steel spheres at various impact velocities
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DOI：
10.1016/j.ijimpeng.2014.03.004
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发表时间：
2014-08
影响因子：
5.1
通讯作者：
G. Seisson;D. Hébert;L. Hallo;J. Chevalier;F. Guillet;L. Berthe;M. Boustie
中科院分区：
文献类型：
--
作者：
G. Seisson;D. Hébert;L. Hallo;J. Chevalier;F. Guillet;L. Berthe;M. Boustie
用直径为0.5 mm的AISI 52100钢制球形弹丸和直径为30 mm、长为15 mm的石墨靶进行了成坑实验。后者由名为EDM 3的商业级多晶和多孔石墨制成，其行为被称为宏观各向同性。两级轻气炮以1.1至4.5 km s-1的速度发射钢射弹。在大多数情况下，死后断层扫描显示，射弹被困，碎片或没有，在目标。结果表明，表观弹坑尺寸和深度随撞击速度的增加而增大。弹坑的体积也是如此，它似乎遵循一种幂律，与以前在类似的撞击条件和材料下建造的弹坑明显不同。与此同时，弹丸的穿透深度在速度超过2.2 km s-1时开始减小。这首先是因为它的塑性变形，然后，超过3.2 km s-1，因为它的碎裂。除了这三个区域的穿透行为已经描述了一些作者，我们提出了第四个区域，其中弹丸熔化起着重要的作用，在速度超过4.1 km s-1。这四个制度的讨论，并指出，每种现象可能占当地的渗透深度的演变。
Cratering experiments have been conducted with 0.5-mm diameter AISI 52100 steel spherical projectiles and 30-mm diameter, 15-mm long graphite targets. The latter were made of a commercial grade of polycrystalline and porous graphite named EDM3 whose behavior is known as macroscopically isotropic. A two-stage light-gas gun launched the steel projectiles at velocities between 1.1 and 4.5 km s−1. In most cases,post-mortemtomographies revealed that the projectile was trapped, fragmented or not, inside the target. It showed that the apparent crater size and depth increase with the impact velocity. This is also the case of the crater volume which appears to follow a power law significantly different from those constructed in previous works for similar impact conditions and materials. Meanwhile, the projectile depth of penetration starts to decrease at velocities beyond 2.2 km s−1. This is firstly because of its plastic deformation and then, beyond 3.2 km s−1, because of its fragmentation. In addition to these three regimes of penetration behavior already described by a few authors, we suggest a fourth regime in which the projectile melting plays a significant role at velocities above 4.1 km s−1. A discussion of these four regimes is provided and indicates that each phenomenon may account for the local evolution of the depth of penetration.