三维编织复合材料圆柱壳在外压作用下的屈曲分析  

BUCKLING OF 3D BRAIDED COMPOSITE CYLINDRICAL SHELLS UNDER EXTERNAL PRESSURES

作　　者：李志敏[1] 沈惠申[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200030

出　　处：《固体力学学报》2008年第1期52-58,共7页Chinese Journal of Solid Mechanics

基　　金：国家自然科学基金(50375091)资助

摘　　要：提出一种三维四向编织复合材料圆柱壳的细观力学模型,宏观上基于Reddy高阶剪切变形理论和广义Kármán型方程,采用奇异摄动法求解在固支边界条件下三维四向编织复合材料圆柱壳在外压作用下的屈曲和后屈曲.分析中同时考虑非线性前屈曲、大挠度和初始几何缺陷的影响.讨论了纤维体积含量、壳体几何参数等因素对圆柱壳屈曲行为的影响.A new micro-macro-mechanical model of unit cells was suggested. In this model, a 3D braided composite is taken as a cell system and the geometry of each cell is closely dependent on its position in the cross-section of the cylindrical shell. Accordingly, a postbuckling analysis is presented for a 3D braided composite cylindrical shell of finite length subjected to external pressure. The governing equations are based on a higher order shear deformation shell theory with avon Kármán-Donnell-type of kinematic nonlinearity. The nonlinear prebuckling deformations and initial geometric imperfections of the shell are both taken into account. A singular perturbation technique is employed to determine the buckling loads and postbuckling equilibrium paths. Effects of fiber volume fraction, shell geometric parameter, and initial geometric imperfections on buckling of cylindrical shells are studied.

关 键 词：三维编织复合材料 高阶剪切变形理论 圆柱壳 屈曲 

分 类 号：TB33[一般工业技术—材料科学与工程]