变化截面复合材料箱型结构后屈曲性态分析

Investigation of post-buckling behavior of various cross-section composite box-like structures

采用以大变形板壳理论为基础的非线性有限元分析方法 ,对复合材料盒段的屈曲、后屈曲性态、应力分布及破坏过程作了比较详尽的研究 .通过对 4种典型截面盒段结构的分析计算 ,指出了线性屈曲理论的局限性和采用非线性理论对研究实际结构屈曲性态和破坏载荷的必要性 .同时讨论了箱型盒段中腹板的布置。

Post-buckling behaviors of various cross-section composite box-like structures are researched using non-linear FEM which is based on large deflection theory. Four section-form designs are compared with one another including buckling modes, displacement and stress distribution. Numerical results show the non-linear theory is much fitter to actual structures. The influences of web location on buckling property are especially discussed.