低速大质量球头弹冲击下薄板塑性动力响应分析

Dynamic plastic response of thin plate subjected to impact of spherical-nosed projectile with low velocity

为研究半穿甲导弹冲击下舷侧结构抗侵彻性能及机理,探讨舷侧抗半穿甲导弹侵彻结构设计,假设低速大质量球头弹冲击下薄板的穿甲破坏可分为隆起变形、碟形变形和弹体贯穿3个阶段,采用理想刚-塑性材料本构模型,同时考虑剪切、弯曲及薄膜拉伸对薄板变形和失效的作用,分析了薄板在冲击过程中的塑性动力响应及三个阶段中的变形吸能,并采用材料有效塑性应变失效准则分析了薄板的穿甲破坏准则,得到了弹体穿甲后的剩余动能和速度、薄板的弹道极限速度以及薄板的最大塑性变形。模型计算结果与实验结果及有限元分析结果吻合良好。

In order to explore the perforation mechanism of topside structure and the design of protective structure subjected to the impact of SAP missile,this paper supposes that the perforation process of thin plate subjected to the impact of spherical-nosed projectile with low velocity is divided into three stages：indentation,dishing deformation and perforation-petalling failure based on the FEM and experimental results.A theoretical model was presented for the dynamic plastic response analysis, deformation and energy absorbing analysis in each phase of thin plate.The target material was consi- dered to be perfect rigid-plastic.And the effect of shear,bend moment and membrane on deformation and failure of thin plate was all considered.The perforation criterion of the thin plate was presented based on the effective plastic strain failure mode.The residual energy and velocity of the projectile after perforation,the ballistic limits and the maximum plastic deformation of the thin plate were obtained.The analytical results agree well with the experimental and FEM ones.