空心侵彻弹侵彻金属靶板的细观损伤行为研究

本文研究了三种钢制截卵形空心侵彻弹侵彻45#钢板的细观损伤机制.靶道试验后对侵彻弹的细观观察结果表明:当侵彻弹以较低速度撞击靶板并保持弹体结构的完整时(发生小变形),其主要细观损伤控制机制为微孔洞机制;当侵彻弹以较高速度撞击靶板,在弹体头部或头部与弹身交接处发生大变形或断裂破坏时,绝热剪切损伤机制为其细观损伤机制.材料的绝热剪切敏感性是侵彻弹毁伤威力和变形破坏的主要细观控制参量.透射电镜(TEM)观察发现绝热剪切带为转变带,带内发生了动态再结晶转变.

MECRO-DAMAGE STUDY OF HOLLOW STEEL PROJECTILES IMPACTING STEEL PLATES

A study with the main objective to investigate the mecro-damage mechanisms occurring in hollow projectiles made of three different steels after penetrating 45# steel plates was presented. After the ballistic impact tests, the mode and distribution of mecro-damages were examined using optical, scanning and transmission electron microscopies. It is found that void and adiabatic shear band were two main mecro-damage mechanisms. When projectiles impact steel plates at relatively low velocities and keep intact after penetration, void is the controlling mecro-damage mechanism. When projectiles impact the targets at high velocities and larger deformation and fracture take place, located at the ogival head of projectile or at transition region from head to body, adiabatic shear band (ASB) is the mecro-damage counterpart. Adiabatic shear banding sensitivity can be taken as the main mecro-damage consideration when the deformation behavior and penetration performance of hollow projectiles are assessed. Transmission electron microscopy observations show that shear bands were of transformed type and dynamic recrystallization occured inside the bands.