摘要
针对受恒定内压载荷的某型号储油箱,将其简化为薄壁同心圆筒结构,基于ABAQUS有限元软件,本文首先进行了线性特征值屈曲分析,得到了结构的前四阶特征值和失稳模态.随后,将线性分析得到的失稳模态作为初始缺陷,采用弧长法,进行非线性失稳分析.非线性失稳分析结果与油箱水压试验结果吻合.接着,基于Python语言,对ABAQUS进行二次开发,建立了同心圆筒的参数化模型,分析了筋条位置对失稳因子的影响,优化了筋条的横截面尺寸,在保证结构加强时所增加质量不变的前提下,最大化地实现了结构的承载能力.研究结果对于今后薄壁轻质结构的失稳分析具有参考价值和指导作用.
Abstract
Aimed at the fuel tank under constant inner pressure load,it is simplified as thin-walled concentric cylinder structure.In this paper,the linear buckle analysis is conducted to get the first four eigenvalue and eigenvector.Then the nonlinear buckle analysis is carried out using the Riks method and the eigenvectors gotten from the previous step are treated as initial imperfection.The result of nonlinear analysis and experiment is very close.Next,parameterized model of thin-walled concentric cylinder is built using Python language to analyze the influence of fillet location and to optimize the cross section dimension of fillet.The bearing capability of structure is maximized with limited mass increase.The research result can be used in future nonlinear buckling analysis of thin-walled structure with great reference value and guiding function.
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