复合材料层合厚板后屈曲

Postbuckling of Composite Laminated Thick Plates

基于Ｒｅｄｄｙ高阶剪切变形板理论，给出复合材料层合厚板在单向压缩作用下的后屈曲分析．分析中应用了由该理论导出的广义大挠度Ｋａｒｍａｎ型方程，考虑两种面内边界条件并计及板的初始几何缺陷．采用摄动法确定板的屈曲载荷和后屈曲平衡路径，给出四边简支反对称角铺设和对称正交铺设层合板的数值结果，同时讨论了横向剪切变形、长宽比、铺层数、面内边界条件和初始几何缺陷等各种参数变化的影响．

Postbuckling analysis is presented for a simply supported, composite laminated thick plate subjected to uniaxial compression. The initial geometrical imperfection of the plate is taken into account . The formulations are based on the Reddy's higher order shear deformation plate theory and the Karman type nonlinear large deflection equations. The analysis uses a deflection type perturbation technique to determine buckling loads and postbuckling equilibrium paths. Numerical examples are presented that relate to the performances of perfect and imperfect, antisymmetrically angle ply and symmetrically cross ply laminated plates. The influence is played by a number of effects, among them the transverse shear deformation, the character of the in plane boundary conditions, the plate aspect ratio, the total number of plies, fiber orientation and initial geometrical imperfections are studied.