加筋壁板结构非线性屈曲数值分析研究

Numerical Analysis of Nonlinear Buckling of a Stiffened Wall Structure

应用非线性有限元分析技术采用ANSYS10.0有限元计算软件细致研究了飞机加筋壁板结构在受压状态下的非线性变形及稳定性特性,考虑了不同边界条件、不同加载方式以及不同筋条厚度对特征值屈曲分析临界载荷的影响。并比较了非线性分析下结构的临界屈曲载荷与线性屈曲分析下的临界屈曲载荷。同时提取板上不同位置上节点的位移/加载曲线,面外挠度/加载曲线,等效应力/加载曲线,对结构非线性特性进行了细致分析和讨论。并以面外挠度为纵坐标得出了长截面与短截面的屈曲波形图,细致表现了加筋板的非线性屈曲形态与规律。

The thesis studies computationally the nonlinear features and stability characteristics of the aircraft stiffened wall structure under the compression, based on nonlinear finite element analysis by ANASYS10.0. The influences of different boundary conditions,loading types, loading positions and plate- beam thick for eigenvalue buckling analysis is considered. The buckling loads in linear and nonlinear analysis in one- type structure are compared. For more detailed analysis and study of the nonlinear features of the compressed structures, the course curves of displacement against loading, surface deflection against loading and stress against loading of the different structural locations are showed to reflect the nonlinear evolution and internal force transformation. The buckling curves of long- drawn- section and short- drawnsection with vertical coordinate of the surface deflection are also showed in order to get a better understanding of the non- linear bucking form.