外压薄壁容器的稳定性分析

Stability Analysis for External Pressure-Undertaking of Thin-walled Vessel

利用柱壳理论建立了横截面为理想椭圆的薄壁容器均布外压作用下的位移形式的基本控制方程。为表征椭圆偏心率的影响,将引入位移函数,采用Galerkin积分得到稳定性的临界条件,得到了不同偏心率下外压容器稳定性的分析结论。然后利用有限元软件ANSYS对外压容器进行了几何非线性分析,求出失稳临界载荷,为提高外压容器安全性和结构设计合理性提供依据。

Basic fuctions in the form of displacement are established about ideal oval thin-walled vessels under external pressure. The section eccentricity is introduced into the displacerment function for the characterization of the impact of elllpse eccentricity, the critical buckling loads subjected to external compression are solved using Galerkin method. The results of the stability analysis for different section eccentricity vessels subjected to external pressure are gained. Then the nonlinear buckling analysis is performed with ANSYS, special finite element analysis software, for external pressure-andertaking of thin-walled vessel to obtain the critical load to lose stability. It can be used as the basis to imorove the safty and structural suitability of extemal vessels