摘要
针对椭圆截面弹体高速非正侵彻混凝土靶弹体结构响应问题,基于任意截面梁弯曲理论引入中性轴概念,建立椭圆空腔截面自由梁在轴力-双侧向弯矩作用下的屈服响应模型,并结合数值仿真与现有实验验证了轴力-双侧向弯矩作用下屈服响应模型的可靠性。分析结果表明:与等截面面积的圆形弹体相比,椭圆截面弹体短轴侧抗弯能力减弱、长轴侧抗弯能力加强;椭圆截面弹体初始滚转角的引入导致弹体薄弱面中性轴的改变,当中性轴靠近长轴侧时,弹体的抗弯能力下降;若弹身进入塑性屈服状态,塑性区的位置亦随中性轴方位角的变化而出现在弹身不同方位处;所建模型可用于初步判断椭圆截面弹体在给定着靶条件下初期的结构稳定问题,为此类弹体结构设计提供指导。
The structural response of an elliptical cross-sectional projectile obliquely penetrating into concrete target at high-speed is analyzed.The concept of the neutral axis is introduced based on the bending theory of arbitrary-section beams,a yield response model of a free beam with elliptical cavity section under the action of axial force and bilateral bending moment is established.The reliability of the yield response model under the action of axial force and bilateral bending moment is verified through numerical simulations and experimental results.The results show that,compared with the circular crosssectional projectile with the same cross-sectional area,the bending resistanceof the elliptic cross-sectional projectile is weakened on the short axis and strengthened on the long axis.The introduction of the initial roll angle of the elliptical cross-sectional projectile leads to a change in the neutral axis of its weak surface.When the neutral axis is near the long axis,the bending resistance of the projectile decreases.If the projectile enters the plastic yield state,the position of the plastic zone also appears in different directions of the projectile with the change in the azimuth of the neutral axis.The research results can be used to preliminarily judge the structural stability of the elliptical cross-sectional projectile at the initial stage of hitting a target,and provide guidance for the structural design of such a projectile.
作者
董恒
邵宇宁
武海军
任光
吕映庆
黄风雷
DONG Heng;SHAO Yuning;WU Haijun;REN Guang;LÜYingqing;HUANG Fenglei(State Key Laboratory of Explosion Science and Safety Protection,Beijing Institute of Technology,Beijing 100081,China)
出处
《兵工学报》
北大核心
2025年第12期358-371,共14页
Acta Armamentarii
基金
国家自然科学基金青年科学基金项目(12202067)
国家自然科学基金叶企孙科学基金项目(U2441209)。
关键词
椭圆截面弹体
双侧向载荷
侵彻
结构响应
elliptical cross-sectional projectile
bilateral loading
penetration
structural response
