球形弹体打击作用下宽距水间隔铝板的动态响应特性

Dynamic responses of wide interval water-spacing aluminum plates under sphere projectile impact

设计了水间隔靶板在球形弹体撞击下动态响应的实验装置,利用高速相机记录了整个过程,分析了不同阶段的复杂物理现象,讨论了弹体在水中运动时的位移变化和速度衰减规律,对比了背空靶板和背水靶板在相近速度弹体侵彻作用下的变形特点。得到以下主要结论:(1)球形弹体侵彻宽间距水间隔铝板的过程可以划分为3个阶段,弹体在水中运动的过程中,水中将产生巨大的空化气穴,弹体动能转变为水的动能和势能,且在弹体碰撞后板后,水中势能再次转化为水的动能施加在靶板上;(2)球形弹体在水中运动过程中,阻力系数近似为常数,约为0.38;(3)球形弹体侵彻时,靶板由于局部径缩产生花瓣开裂,背水靶板将比背空靶板产生更小的塑性变形,且背水靶板的花瓣开裂数更少。

An experiment device was set up to investigate the dynamic responses of water-spacing aluminum plates,and a super-speed camera was used to record the whole process with complex phenomena in different stages. The projectile velocity and the deformation during its motion in water were studied and the failure modes for water-back plate and airback pates were analysed. It is gained that： the process can be divided into three stages,and the kinetic energy of the projectile transforms to the kinetic energy and potential energy of water; the projectile resistance when moving in water is a constant,about 0. 38; the failure modes of the plates is mainly the radial-shrinkage and the successive petal breaking,and the local deformation and petal number of water-back plates are much less than those of air-back plates.