基于有限元法的内压容器封头局部屈曲分析
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摘要
采用有限元法分析了压力容器筒体与封头连接区的应力分布规律以及封头局部屈曲失稳。结果表明,在相同内压下,壁厚较大时压力容器的临界屈曲载荷较大,即结构较稳定不易出现局部屈曲;随着施加内压的增大,封头与筒体连接区的应力分布规律不变,而应力最大值与最小值之差增大,即封头与筒体连接区更易发生局部屈曲。
The stress and localized buckling of connection of cylinder and head of pressure vessel are analysed by the finite element method.The results indicate that under the same internal pressure,the critical buckling load of the pressure vessel is larger when the wall thickness is larger,that is,the structure is more stable and it is not easy to appear localized buckling.With the increase of internal pressure,the stress distribution of the connecting area between the head and the cylinder remains unchanged,but the difference between the maximum and minimum values of stress increases,which means that the connection area between the head and the cylinder is easier to appear localized buckling.
The stress and localized buckling of connection of cylinder and head of pressure vessel are analysed by the finite element method.The results indicate that under the same internal pressure,the critical buckling load of the pressure vessel is larger when the wall thickness is larger,that is,the structure is more stable and it is not easy to appear localized buckling.With the increase of internal pressure,the stress distribution of the connecting area between the head and the cylinder remains unchanged,but the difference between the maximum and minimum values of stress increases,which means that the connection area between the head and the cylinder is easier to appear localized buckling.
引文
[1]杨娅君,陶伟明,郭乙木.内压作用下压力容器封头局部屈曲分析[J].机械工程学报,2004,40(7):187-189.
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[6]沈敏敬,龙连春,陈兴华,等.激光辐照下圆柱壳结构的稳定性分析[J].计算力学学报,2008,25:124-128.
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[12]蒲广益.ANSYS Workbench 12基础教程与实例详解[M].北京:中国水利水电出版社,2010:178.
[2]万力,陶伟明,吴莘馨,等.由初始几何缺陷引起的薄壁压力容器在内压作用下的局部非线性屈曲[J].核动力工程,2004,25(5):434-438.
[3]ROCHA L A O,REAL M V,CORREIA A L G,et al.Geometric optimization based on the constructional design of perforated thin plates subject to buckling[J].Computational Thermal Sciences,2012,4(2):119-129.
[4]MAIORANA E,CARLO PELLEGRINO,CLAUDIO MODE-NA.Elastic stability of plates with circular and rectangular holes subjected to axial compression and bending moment[J].Thin-Walled Structure,2009,47:241-255.
[5]MAIORANA E,CARLO PELLEGRINO,CLAUDIO MODE-NA.Linear buckling analysis of perforated plates subjected to localized symmetrical load[J].Engineering Structures,2008,30:151-158.
[6]沈敏敬,龙连春,陈兴华,等.激光辐照下圆柱壳结构的稳定性分析[J].计算力学学报,2008,25:124-128.
[7]程魁,高勇,王勇.基于ANSYS Workbench的压力容器筒体与封头连接区的应力分析[J].广东化工,2013,40(12):153-154.
[8]张彤,汤国伟,殷雅俊.薄壁压力容器在内压作用下的弹塑性屈曲行为研究[J].压力容器,2010,27(3):17-25.
[9]汤国伟,张彤.碟形封头压力容器在内压作用下的弹塑性屈曲及后屈曲行为研究[J].压力容器,2012,29(10):16-22.
[10]沈敏敬.激光辐照下圆柱壳结构屈曲分析及优化设计[D].北京:北京工业大学,2008.
[11]凌桂龙.ANSYS Workbench 15.0从入门到精通[M].北京:清华大学出版社,2014:68.
[12]蒲广益.ANSYS Workbench 12基础教程与实例详解[M].北京:中国水利水电出版社,2010:178.