结构变形对深侵彻弹体偏转的影响  

Influence of structural deformation on the deflection of penetrator into concrete target with deep penetration

作　　者：何丽灵[1,2] 郭虎 陈小伟[3,4] 颜怡霞 李继承 陈刚[1,2] HE Liling;GUO Hu;CHEN Xiaowei;YAN Yixia;LI Jicheng;CHEN Gang(Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang 621999,Sichuan,China;Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province,Mianyang 621999,Sichuan,China;Advanced Research Institute for Multidisciplinary Science,Beijing Institute of Technology,Beijing 100081,China;State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]中国工程物理研究院总体工程研究所,四川绵阳621999 [2]工程材料与结构冲击振动四川省重点实验室,四川绵阳621999 [3]北京理工大学前沿交叉科学研究院,北京100081 [4]北京理工大学爆炸科学与技术国家重点实验室,北京100081

出　　处：《爆炸与冲击》2023年第9期74-88,共15页Explosion and Shock Waves

基　　金：国家自然科学基金(11302210);中国工程物理研究院创新与发展基金(CX20210031);四川省自然科学基金(2023NSFSC1913)。

摘　　要：钻地弹是打击地下工事的利器,弹道偏转是降低钻地弹侵彻效率的重要原因之一,弹道偏转的本质原因是弹体偏转,亟需快速且精确地预测多侵彻姿态下弹体的侵深与偏转角度。基于微分面力法,将计及有限大靶所有自由面影响的靶体响应力函数加载在弹体表面,快速模拟了弹体的运动和变形。靶体响应力函数和数值计算模型通过了试验校核。利用刚性弹与可变形弹的运动和变形的对比,剥离并分析了结构变形对弹体偏转的影响。分析显示,结构变形是可变形弹偏转的驱动源之一,其可改变弹体外力矩,并影响弹体瞬时偏转速度。相同条件下,可变形弹偏转角度大于刚性弹。随着弹体长径比减小、着靶速度降低及侵彻斜角增大,刚性弹偏转角度增大;而随着弹体长径比增大、侵彻斜角增大及弹体壁厚减小,可变形弹偏转角度增大。着靶速度对可变形弹偏转角度的影响不单调。当着靶速度不高于800 m/s、侵彻斜角不小于20°时,着靶速度越高、侵彻斜角越大、弹体长径比越大、壁厚越小,则结构变形对弹体偏转的贡献越大。为此,建议选择可变形弹分析非理想侵彻弹体的运动和变形,以提高分析精度与合理性。Earth penetration weapon(EPW)is commonly used to attack the underground target.However,the ballistic trajectory deflection,which is essentially caused by the deflection of the penetrator,commonly decreases the penetration efficiency of the penetrator.Thus,both the deflection angle and depth of penetration(DOP)of the projectile demand rapid and precise predictions.Based on the differential-areal-force-law(DAFL)approach,an analytical contact-resistant pressure is applied on the projectile surface in simulation.It represents the resistant force of the target and considers the free-surface effects of all surfaces of a finite concrete target.The simulation model is verified by comparing with the test results of the DOP and rotation angle of projectiles in open references.The influence of structural deformation upon the deflection of the penetrator is investigated by comparing the dynamics and movement of rigid and deformable projectiles.It indicates that the structural deformation drives the deformable projectile to deflect,which changes the total moment and instant angular velocity of the projectile.Under the same impact conditions,the rotation angle of the deformable projectile is usually larger than that of the rigid projectile.With the aspect ratio of projectile and impact velocity of the projectile decreasing,and the oblique angle of the projectile increasing,the rotation angle of the rigid projectile increases.However,for the deformable projectile,with the aspect ratio and oblique angle of the projectile increasing and the thickness of the projectile decreasing,the rotation angle of projectile increases.The rotation angle of deformable projectile does not monotonously increase with the impact velocity of the projectile increasing.It should be analyzed according to its actual structural deformation.When the impact velocity is less than or equal to 800 m/s and the oblique angle of the projectile is larger than or equal to 20°,the higher the impact velocity,the larger the oblique angle and the aspect ratio,the thi

关 键 词：弹体偏转 结构变形 刚体转动 自由面效应 

分 类 号：O385[理学—流体力学]