真空引起的薄壁圆筒屈曲压力预测

研究均匀外压力下初始缺陷对圆柱形薄壳结构屈曲性能的影响。对缩尺薄壁圆筒的外形进行分析以测量壳体表面的几何缺陷。有限元分析时将这些初始缺陷考虑在内,并进行静态几何非线性分析。在实验室进行圆筒的倒塌试验,并将试验结果和有限元分析结果进行比较。结果表明,有限元分析能够准确预测圆筒的破坏坍塌压力和后屈曲模态。

Prediction of Vacuum-Induced Buckling Pressures of Thin-Walled Cylinders

The effect of geometric imperfections on the buckling capacity of thin cylindrical shells subjected to uniform external pressure is investigated in this paper. Geometric surveys were conducted on small-scale thin cylinders in order to measure geometric imperfections of the shell surface. These imperfections were then modelled in the FE analysis and a geometrically nonlinear static analysis was carried out. The cylinders are tested to collapse in the laboratory and the results are compared to the results of the FE analysis. Both collapse pressure and postbuckling mode shape are accurately predicted by the FE analysis.