高速球形弹丸对飞机油箱结构的毁伤效应影响

目的研究高速球形弹丸对飞机油箱结构的毁伤效应。方法基于LS-DYNA有限元分析软件和光滑粒子流体动力学理论,建立弹丸高速冲击充液油箱的动力学分析模型,分析不同弹丸冲击速度、不同充液比例情况下油箱结构的动态冲击响应和毁伤机理。结果充液比例对弹丸的速度衰减变化几乎没有影响;弹丸速度和充液比例均对油箱结构的动态冲击响应有较大影响。随着弹丸速度的增加,油箱前后壁板的变形量逐渐增加;随着充液比例的增加,油箱结构的变形量逐渐增大,破坏也更严重,且部分充液箱体的变形明显小于完全充液的情况。结论充液比例越大、弹丸速度越高,油箱毁伤程度越大。

Damage Effect of Aircraft Fuel Tank Structure under Spherical Projectile Impact at High Speed

Objective To study damage effect of high speed projectile on the structure of aircraft fuel tank. Methods A dynamic analysis model for high-speed projectile impact on water-filled fuel tank was established based on LS-DYNA finite element analysis software and the theory of smooth particle hydrodynamics. The dynamic impact response and damage effect of the fuel tank structure under different projectile impact velocity and different liquid filling ratio were analyzed. Results The liquid filling ratio had little effect on the velocity attenuation of the projectile. The projectile speed and the liquid filling ratio had significant effects on dynamic impulse response of the fuel tank structure. With the increase of the projectile velocity, the deformation of the front and back plates increased gradually. With the increase of the proportion of filling, the deformation of the structure also increased gradually and the damage was more serious. In addition, the deformation of partially filled aircraft fuel tanks was significantly less than that of the fully filled fuel tank. Conclusion Damage of the aircraft fuel tank increased with the increase of liquid filling proportion and projectile velocity.