Ti/Al/Mg阻抗梯度结构超高速撞击数值模拟
2025,47(1):136-146
陈兴
中国工程物理研究院总体工程研究所， 四川 绵阳 621900
徐大富
上海宇航系统工程研究所， 上海 201108
刘占芳
重庆大学 航空航天学院， 重庆 400044
卫国宁
上海宇航系统工程研究所， 上海 201108
卢永刚
中国工程物理研究院总体工程研究所， 四川 绵阳 621900
中国工程物理研究院总体工程研究所， 四川 绵阳 621900
徐大富
上海宇航系统工程研究所， 上海 201108
刘占芳
重庆大学 航空航天学院， 重庆 400044
卫国宁
上海宇航系统工程研究所， 上海 201108
卢永刚
中国工程物理研究院总体工程研究所， 四川 绵阳 621900
摘要：
基于AUTODYN有限元软件，研究Ti/Mg厚度比值（简称Ti/Mg比值）、结构厚度/弹丸直径（t/D）比值和撞击角度θ对Ti/Al/Mg阻抗梯度结构超高速撞击特性的影响。结果表明，Ti/Mg厚度比值对外泡碎片云膨胀特性的影响在5%以内，但增加Ti/Mg比值能提高弹丸的破碎程度，Ti/Mg比值在0.625~1之间结构耗能特性最佳；随着t/D比值的增加，外泡碎片云膨胀速度和弹丸中心大碎片质量越小，而结构的单位面密度吸能量降低；斜撞击有利于阻抗梯度结构对弹丸动能的耗散，但会降低弹丸的破碎程度，θ大于40°或50°后，“滑弹效应”对阻抗梯度结构撞击特性的影响较为显著；阻抗梯度结构穿孔面积随Ti/Mg比值和t/D比值的增加而降低，随θ增加而增加，并基于量纲分析拟合出了阻抗梯度结构的无量纲穿孔面积经验计算公式。
基于AUTODYN有限元软件，研究Ti/Mg厚度比值（简称Ti/Mg比值）、结构厚度/弹丸直径（t/D）比值和撞击角度θ对Ti/Al/Mg阻抗梯度结构超高速撞击特性的影响。结果表明，Ti/Mg厚度比值对外泡碎片云膨胀特性的影响在5%以内，但增加Ti/Mg比值能提高弹丸的破碎程度，Ti/Mg比值在0.625~1之间结构耗能特性最佳；随着t/D比值的增加，外泡碎片云膨胀速度和弹丸中心大碎片质量越小，而结构的单位面密度吸能量降低；斜撞击有利于阻抗梯度结构对弹丸动能的耗散，但会降低弹丸的破碎程度，θ大于40°或50°后，“滑弹效应”对阻抗梯度结构撞击特性的影响较为显著；阻抗梯度结构穿孔面积随Ti/Mg比值和t/D比值的增加而降低，随θ增加而增加，并基于量纲分析拟合出了阻抗梯度结构的无量纲穿孔面积经验计算公式。
基金项目：
国家自然科学基金资助项目（11672278）
国家自然科学基金资助项目（11672278）
Numerical simulation of Ti/Al/Mg impedance-graded structure under hypervelocity impact
CHEN Xing
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621900 , China
XU Dafu
Shanghai Institute of Aerospace Systems Engineering, Shanghai 201108 , China
LIU Zhanfang
College of Aerospace Engineering, Chongqing University, Chongqing 400044 , China
WEI Guoning
Shanghai Institute of Aerospace Systems Engineering, Shanghai 201108 , China
LU Yonggang
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621900 , China
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621900 , China
XU Dafu
Shanghai Institute of Aerospace Systems Engineering, Shanghai 201108 , China
LIU Zhanfang
College of Aerospace Engineering, Chongqing University, Chongqing 400044 , China
WEI Guoning
Shanghai Institute of Aerospace Systems Engineering, Shanghai 201108 , China
LU Yonggang
Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang 621900 , China
Abstract：
The effects of Ti/Mg thickness ratio(abbreviated as Ti/Mg ratio), structural thickness/projectile diameter(t/D) ratio and impact angle θ on the hypervelocity impact characteristics of Ti/Al/Mg impedance gradient structures were studied with AUTODYN finite element software. Results show that the influence of Ti/Mg ratio on the expansion characteristics of the outer bubble fragment cloud is within 5%, but increasing the Ti/Mg ratio can improve the degree of fragmentation of the projectile. The structural energy absorption characteristics are best within the range of 0.625 to 1. The expansion speed of the outer bubble fragment cloud and the mass of the large fragment at the center of the projectile decrease with the increase of t/D ratio, while the unit face density energy absorption decreases. Oblique impact is beneficial to the dissipation of projectile kinetic energy by the impedance gradient structure, but it will reduce the degree of fragmentation of the projectile. After θ exceeds 40° or 50°, the "slip effect" has a significant impact on the impact characteristics of the impedance gradient structure. The perforation area of the impedance gradient structure decreases with the increase of Ti/Mg ratio and t/D ratio, and increases with the increase of θ, and an empirical formula for the dimensionless perforation area of the impedance gradient structure is obtained based on dimensional analysis.
The effects of Ti/Mg thickness ratio(abbreviated as Ti/Mg ratio), structural thickness/projectile diameter(t/D) ratio and impact angle θ on the hypervelocity impact characteristics of Ti/Al/Mg impedance gradient structures were studied with AUTODYN finite element software. Results show that the influence of Ti/Mg ratio on the expansion characteristics of the outer bubble fragment cloud is within 5%, but increasing the Ti/Mg ratio can improve the degree of fragmentation of the projectile. The structural energy absorption characteristics are best within the range of 0.625 to 1. The expansion speed of the outer bubble fragment cloud and the mass of the large fragment at the center of the projectile decrease with the increase of t/D ratio, while the unit face density energy absorption decreases. Oblique impact is beneficial to the dissipation of projectile kinetic energy by the impedance gradient structure, but it will reduce the degree of fragmentation of the projectile. After θ exceeds 40° or 50°, the "slip effect" has a significant impact on the impact characteristics of the impedance gradient structure. The perforation area of the impedance gradient structure decreases with the increase of Ti/Mg ratio and t/D ratio, and increases with the increase of θ, and an empirical formula for the dimensionless perforation area of the impedance gradient structure is obtained based on dimensional analysis.
Key words：
收稿日期：
2022-10-09
2022-10-09
