摘要
提出了一种由金字塔型点阵金属骨架、陶瓷棒、环氧树脂胶结剂、金属面板及背板所组成的复合材料结构模型。基于有限元法,在实验验证数值方法有效性的基础上,模拟研究了该型复合结构对三类钢制弹丸(平头、球头和锥头)的抗侵彻机制。对比分析了弹靶模型各子结构的失效模式、吸能效率、弹丸的塑性变形、弹道特性、速度及加速度等变化规律。结果表明:弹头形态对复合靶板的破坏形态和吸能特性有较大影响,平头弹丸和球头弹丸对靶板主要产生冲塞破坏,达到峰值加速度的时间较短;而锥头弹丸主要表现为刺穿扩孔型破坏,达到峰值加速度的时间较长,侵彻效能最高。在弹体高速侵彻靶板的过程中,由于金属骨架的剪切扩孔和塑性变形、陶瓷棒的断裂破坏以及金属面板与背板的塑性变形,使得该型防护结构的抗侵彻能力得到了显著提高。
A structural model of composite materials composed of the metal skeleton,ceramic rods,epoxy,front and back metal plates was proposed.Based on the finite element method,the validity of numerical method was proved by the available experiments.Then,anti-penetration mechanisms of the composite structures were simulated in the process of penetration with three types of steel projectiles(flat-warhead,hemispherical-warhead and conical-warhead).The sub-structures failure modes,energy absorption efficiency,plastic deformation,ballistic performances,velocities and accelerations of the projectiles target plate were analyzed.The results showed that the warhead shape had a great effect on the damage mechanisms and energy absorption characteristics.The flat-warhead and hemispherical-warhead projectiles mainly resulted in crushing damage to the target plate,and the peak acceleration time was shorter.However,the conical-warhead projectile penetration into the target plate mainly resulted in piercing and reaming.The peak acceleration time was greater and the penetration efficiency was the highest.During the projectile penetration,the shear hole and plastic deformation of the metal skeleton,the fracture of the ceramic rod and the plastic deformation of the metal front plate and the metal back plate significantly improved the antipenetration ability of the structure.
作者
张俊
贾广臣
徐国军
刘荣忠
郭锐
ZHANG Jun;JIA Guangchen;XU Guojun;LIU Rongzhong;GUO Rui(College of Engineering Science and Technology,Shanghai Ocean University,Shanghai 201306,China;School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2020年第1期1-8,共8页
Journal of Aerospace Power
基金
国家自然科学基金(51775329)
上海市科委创新行动计划(17050502000)
上海市临港管委会产学研合作项目(2017-056).
关键词
冲击动力学仿真
金属陶瓷复合材料
抗侵彻机理
金属骨架
点阵夹层结构
impact dynamics simulation
metal-ceramic composites
anti-penetration mechanism
metal skeleton
lattice sandwich structure
