脱层壳屈曲的一阶剪切理论

脱层的存在将会大大降低层合结构的屈曲载荷。本文将含任意位置环向贯穿脱层的轴压圆柱壳分成多段子壳 ,用厚度的一次多项式模拟脱层壳屈曲时子壳的轴向和环向位移 ,利用变分原理导出了脱层壳的屈曲方程和定解条件 ,并用状态空间方法进行求解。通过与经典理论的比较 ,指出了它们各自的适用范围 ;考虑脱层壳的三种不同屈曲模态 ,分析了边界条件、脱层长度、深度对脱层壳屈曲载荷的影响 ;最后给出了正交各向异性脱层壳的屈曲分析

Buckling Analysis of Delaminated Shell for the First Order Shear Deformation Theory

Delaminations may greatly reduce the buckling load of the laminated structure. Cylinder including arbitrary delaminations in longitudinal and thickness and spaning the entire circumference was divided into multiple sublaminates shell whose longitude displacements were simulated with linear function of the thickness coordinate. The variational principle was applied to obtain the governing equations and boundary conditions. The state-space scheme was used to solve the problem. By comparing with classical theory, the usable range of each theory was pointed out. Three difference buckling modes of delaminated shell were considered. The influence of boundary condition, length and depth of delamination on buckling load was analyzed. Finally, the buckling analysis of delaminlated orthotropic shell was given.