细长薄壁弹体的屈曲和靶体等效分析

利用金属靶开展动能深侵彻弹的穿甲屈曲实验研究。实验观察到长/短型弹体动塑性屈曲破坏分别表现为轴向皱褶型和轴向外翻撕裂型2种基本模式。不同的屈曲破坏模式与弹体几何、撞击初条件以及靶材等密切相关。区别于刚性尖头弹穿甲金属靶的韧性隧道开孔，尖头弹因屈曲破坏易变形为钝头形，导致弹体穿透靶板表现为挤凿穿甲。利用薄壁中空柱壳的弹性欧拉屈曲分析和弹体塑性屈服的极限分析给出弹体动塑性屈曲的临界条件。同时给出屈曲实验中混凝土靶和金属靶的等效条件。

Buckling analysis of earth penetrating warhead and equivalent conditions of targets

The dynamic plastic buckling of earth penetrating weapon(EPW) was experimentally studied.Two failure modes,i.e.,crapy buckling and dynamic expansion buckling for different length-diameter-ratio projectiles,were observed in the tests.Different failure modes depend on the geometry of projectile,initial impact conditions and target material.Distinguished from the ductile hole enlarging for rigid sharp projectile impacting metallic target,the buckling failure may induce a sharp projectile to severely deform like blunter nose and perforate the target plate as shear plugging.Critical condition of dynamic plastic buckling of projectile was defined based on the analyses of Euler elastic buckling of hollow slender shell and plastic yielding limit of projectiles.The equivalent condition of steel plate and concrete target was formulated.