摘要
针对长杆弹侵彻半无限厚金属靶过程中第3侵彻阶段机理不清的问题,建立了三维光滑粒子流体动力学有限元模型,在验证模型有效性的基础上,开展了金杆侵彻半无限厚7075-T6铝靶研究,对第3侵彻阶段机理进行探索,并分析弹/靶密度、强度和弹体长径比对侵彻的影响规律。研究结果表明:金杆侵彻7075-T6铝靶的侵彻深度曲线在高速段显著超过流体动力学极限是由倒转金杆碎片对靶板的二次侵彻造成的;金杆销蚀后形成管状碎片体,高初速下其速度较大,其方向与侵彻方向一致,且其密度大,因此它会在弹体完全销蚀后继续侵彻靶体;金杆的二次侵彻深度随撞击速度增大呈“S”形增大,它对总侵彻深度的贡献在3 km/s撞击速度下甚至高达15.6%;存在二次侵彻时,长杆弹侵彻半无限靶第3侵彻阶段划分为剩余侵彻和二次侵彻阶段更合适;高弹靶密度比有利于形成二次侵彻现象;靶体密度和强度对总侵彻性能的影响显著超过弹体密度和强度;无论是保持弹体长度还是质量不变,长径比对流体动力学侵深和总侵深有显著的影响,但对二次侵彻的影响却较小。
A 3D SPH-FEM finite element model is established to further investigate the penetration mechanism of long-rod projectile at the third penetration stage.On the basis of verifying the effectiveness of the model,a penetration of gold rod against a semi-infinite thick 7075-T6 aluminum target is studied,the mechanism of the third penetration stage is explored,and the influence law of projectile/target density and strength,and L/D of projectile on penetration is also analyzed.The calculated results show that the reason why the P/L vs.striking velocity curve for gold rod penetrating 7075-T6 aluminum target is broken is the secondary penetration of the inverted rod debris.A tubular fragment is formed after the gold rod is eroded.At high initial velocity,its velocity is higher,its direction is consistent with the penetration direction,and its density is large.Therefore,it will continue to penetrate the target after the projectile body is completely eroded.The secondary penetration depth of the gold rod increases in an “S” shape with the increase in striking velocity,and its contribution to the total penetration depth is even as high as 15.6% at striking velocity of 3 km/s.When there is a secondary penetration,it is more appropriate to divide the third penetration stage into residual and secondary penetration stages.High projectile-target density ratio is beneficial for the formation of secondary penetration.The influence of the target density and strength on the penetration capability significantly exceeds that of the projectile.Under the conditions of the unchanged length or mass of the projectile,the effect of length-to-diameter ratio on the hydrodynamics and total penetration depth is significant,but its effect on the secondary penetration is small.
作者
唐奎
王金相
刘亮涛
杨明
TANG Kui;WANG Jinxiang;LIU Liangtao;YANG Ming(National Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China)
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2023年第12期3707-3718,共12页
Acta Armamentarii
基金
国家自然科学基金项目(12102202、12002168、12102427)
江苏省博士后基金项目(2021K272B)。
关键词
金长杆弹
二次侵彻
7075-T6铝靶
数值模拟
gold long-rod
secondary penetration
7075-T6 aluminum target
numerical simulation