弹塑性球形薄壳在刚性柱体冲击下的破坏分析

Failure Analysis of ElasticPlastic Thin Spherical Shells Impacted by a FlatNose Rigid Missile

在引入曲面弯曲的等度量变换的基础上，研究了弹塑性球形薄壳在刚性平头圆柱体冲击下的大变形破坏行为．通过能量守恒，建立了弹体初速与变形之间的关系，进而得到壳体受冲击后的残余窝陷半径和中心点位移与弹体初速之间关系的闭合近似解．计算结果与实验数据做了比较，表明二者之间具有较好的一致性，这说明本文的分析方法和计算结果对工程设计将具有重要参考价值．

A theoretical analysis of large deformation failure of elasticplastic thin spherical shell impacted by a flatnose rigid missile was presented by introducng isometrical transformation of surface bending.Based on the conservation of energy,a relationship between the permanent dimple radius and the initial missile kinetic energy was derived.The present analysis was shown to agree with some available experimental results and can thus be used to predict the degree of missile impacted spherical shells.