充液格栅结构抗射弹冲击特性研究

为研究充液格栅结构抗射弹冲击特性,基于二级空气炮系统开展1×1、3×3和5×5格栅结构抗射弹冲击实验,获得射弹速度变化和壁板应变等物理量,并通过LS-DYNA有限元软件,建立经实验验证的有限元模型,研究射弹速度全场变化、壁板变形等。结果表明:格栅结构后壁板变形最严重,且壁板下半部分变形大于上半部分;在内部壁板变形和流体对前壁板的共同作用下,5×5格栅结构前壁板变形趋势与1×1和3×3格栅结构不同;格栅结构在射弹冲击过程中获得的总能量随格栅数量的增加而增加,但内部壁板变形耗散更多的能量,导致格栅外部壁板变形反而减小,提高了结构的抗毁伤能力。

Research on Anti-projectile Impact Characteristics of Liquid-filled Grid Structure

In order to study the anti-projectile impact characteristics of the liquid-filled grid structure, the impact damage experiments of 1×1, 3×3 and 5×5 grid structures were carried out based on the two-stage air gun system. And some physical quantities such as projectile partial velocity and wall strain were obtained. Then the experimentally validated finite element model was established based on LS-DYNA finite element software. The physical quantities of the full-field variation of projectile velocity and wall deformation were obtained on the basis of experiments. The results show that the deformation of the rear panel is more serious than other panel, and the deformation of the lower half of the panel is larger than that of the upper half; and under the combined action of internal panel deformation and fluid flow on front panel, the deformation trend of front panel of 5×5 grid structure is different from that of 1×1 and 3×3 grid structure; the total energy obtained in the process of projectile impact increases with the increase of the number of grids, but the deformation of the inner panel dissipates more energy, which leads to the decrease of the deformation of the outer panel of the grids and improves the damage resistance of the structure.