复合材料加筋圆拱壳的失稳特性分析

本文应用增量形式的拉格朗日列式法对其有纵横加筋的迭层圆拱壳在均布载荷作用下的稳定性进行了非线性有限元分析。文中应用Sander 壳体理论及横向剪切的影响, 推导了矩形壳元及与该壳元变形相协调的直梁元和曲梁元的切线刚度矩阵。编制了FORTRAN 计算程序。计算并分析了加筋拱壳的局部及整体失稳过程。 

ANALYSIS OF INSTABILITY FOR LAMINATED COMPOSITE CYLINDRICAL SHELLS WITH LONGITUDINAL STIFFENERS AND TRANSVERSE FRAMES

A nonlinear finite element based on the total Lagrangian incremental formulation of a two dimensional anisotropic medium is developed, and its application in the geometrical nonlinear buckling and postbuckling analysis of stiffened layered composite shell is demonstrated via example problems under the combination of mechanical loading and hygrothermal loading. The finite element based on the Sander's shell theory with transverse shear strains is also presented. The tangential stiffness matrices of rectangle shell finite element, the beam and curved beam, the equivalent hygrothermal force vector, and the method of analysis of buckling and postbuckling are given. Finally, several example problems are illustrated by the FORTRAN Programme.