摘要
为进一步研究柱形弹体超高速撞击靶板的破片群扩展、弹体侵蚀等问题,开展柱形93钨弹体超高速撞击薄钢板实验研究。通过量纲分析方法给出柱形弹体穿靶的穿孔直径经验公式;利用高速摄像技术获得靶后破片群运动图像,分析破片群扩展规律以及弹体的侵蚀规律;基于微观组织分析,探索超高速撞击中弹靶材料的熔化问题。结果表明:通过对实验数据的拟合,认为在弹靶材料不变的情况下,靶板穿孔直径、靶后破片群轴向扩展最大速度、横向扩展最大速度近似和弹体直径、靶板厚度、撞击速度相关,而对于弹体侵蚀长度,除上述参数外还与弹体长径比相关;在柱形弹体超高速撞击靶板问题中,靶板背表面产生层裂并在破片群前部形成速度大于剩余弹体速度的“尖端”,可近似由靶板厚度小于弹体直径的0.72倍来确定;当柱形93钨弹体以2~3 km/s速度撞击靶板时,靶后破片群尚未发生大范围熔化,但当破片群、剩余弹体撞击第2层靶板时,受到二次加载作用,撞击区附近将发生大范围的材料熔化。
The experimental research on the impact of 93 tungsten cylindrical projectile on thin steel plate is carried out to further study the fragment group expansion and projectile erosion of cylindrical projectile during hypervelocity impact on target plate.The empirical formula of perforation diameter of cylindrical projectile penetrating into target is given through the dimensional analysis method.The moving image of fragments behind the target is obtained by using high-speed camera,and the expansion law of fragment group and the erosion law of projectile are analyzed.The melting problems of projectile and target materials in hypervelocity impact is explored by analyzing the microstructure.It can be known from fitted experimental data that the perforation diameter of target plate,the maximum axial expansion velocity and maximum transverse expansion velocity of fragments are approximately related to the diameter of projectile,the thickness of target plate,and the impact velocity,and the projectile erosion length is also related to the projectile length-to-diameter ratio in addition to the above parameters.In the hypervelocity impact of cylindrical projectile on target plate,spallation occurs on the back surface of target plate,and a‘tip’of velocity greater than the velocity of remaining projectile is formed in the front of the fragment group,which can be approximately determined by the thickness of target plate being less than 0.72 times of projectile diameter.When the 93 tungsten cylindrical projectile impacts the steel target at the speed of 2-3 km/s,the fragment group behind the target is not melted in a large range,but when the fragments and the remaining projectile impact the second layer of target plate,the material near the impact zone melts in a large range.
作者
马坤
陈春林
冯娜
尹立新
李名锐
周刚
MA Kun;CHEN Chunlin;FENG Na;YIN Lixin;LI Mingrui;ZHOU Gang(Northwest Institute of Nuclear Technology, Xi'an 710024, Shaanxi, China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2021年第11期2350-2359,共10页
Acta Armamentarii
基金
国家自然科学基金项目(11772269、11402213)。
关键词
柱形93钨弹体
超高速撞击
薄钢板
穿孔直径
破片群扩展
弹体侵蚀
材料熔化
cylindrical 93 tungsten projectile
hypervelocity impact
thin steel plate
perforation diameter
fragment group expansion
projectile erosion
material melting