大长径比弹体侵彻混凝土结构强度、稳定性及振动特性研究  

Analysis on structural strength,stability and vibration characteristics of slender projectile on penetrating into concrete

作　　者：郑卓扬 武海军[1] 董恒 李萌[1] 皮爱国[1] ZHENG Zhuoyang;WU Haijun;DONG Heng;LI Meng;PI Aiguo(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]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：《兵器装备工程学报》2023年第11期1-12,共12页Journal of Ordnance Equipment Engineering

基　　金：青年科学基金项目(12202067)。

摘　　要：针对典型大长径比弹体SDB在侵彻混凝土靶时的结构强度及稳定性问题,基于空腔膨胀阻力模型,给出了其在不同打击工况下极限安全壁厚、抗弯破坏临界倾角及攻角的控制要求。基于压弯耦合屈服条件,研究了着靶速度、着靶姿态及无量纲壁厚对弹体结构塑性弯曲失稳的影响规律,进一步得到了保证弹体稳定条件下结构参数(长径比、无量纲壁厚)、着靶状态参数(着靶速度、着靶姿态)及弹体材料强度间的耦合约束控制条件。考虑大长径比对弹体结构振动响应的影响,通过有限元模态分析及谐响应分析获取了弹体结构的固有频率及模态振型,揭示了结构的振动响应特性。研究结论和成果可为大长径比弹体结构设计、能力评估及弹目交汇参数控制提供思路和依据。Aiming at the structural strength and stability of the typical large aspect ratio projectile SDB(small diameter bomb)when penetrating concrete targets,based on the cavity expansion resistance model,the control requirements of limit dimensionless thickness of projectile,critical oblique angle and attacking angle under different striking conditions are given.Based on compression-bending coupling yielding conditions,the influence of targeting velocity,targeting posture and dimensionless thickness of projectiles on the plastic bending instability of the projectile structure are studied.The control conditions for the coupling between the structural parameters(aspect ratio,dimensionless thickness of projectiles),the parameters of the targeting state(targeting velocity and targeting posture)and the strength of the projectile material are obtained under the condition to ensure the structural stability of the projectile.Considering the influence of the large aspect ratio on the vibration response of the projectile structure,the inherent frequency and the modal pattern of the projectile structure are obtained through the finite element modal analysis and harmonic response,and the vibration response characteristics of the projectile structure are revealed.The research content and results provide ideas and basis for the structural design,capability assessment and parameter control of the projectile and target intersection of large aspect ratio projectile.

关 键 词：大长径比 侵彻 结构强度 结构稳定性 振动特性 

分 类 号：O385[理学—流体力学] TJ410[理学—力学]