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基于模态缺陷的受压球壳屈曲特性研究
Research on Buckling Behavior of the Spherical Pressure Hull Considering Initial Imperfections
投稿时间:2018-07-07  修订日期:2018-08-28
DOI:
中文关键词:  受压球壳  屈曲特性  非线性有限元  EN1993-1-6(2007)  模态缺陷法
英文关键词:Spherical pressure hull  buckling behavior  nonlinear finite element method  EN1993-1-6(2007)  Mode imperfection method
基金项目:国家重点研发计划项目(2016YFC0304303)资助项目. 江苏省高职院校青年教师企业实践培训(2018QYSJ006)资助项目.
作者单位E-mail
罗珊 中国船舶科学研究中心 Rosa0713@163.com 
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中文摘要:
      针对受压球壳非线性屈曲过程,对含初始缺陷受压球壳的稳定性进行研究。根据EN1993-1-6(2007)规范,给出不同制造等级壳体的等效缺陷值计算方法;初始缺陷的分布基于线性特征值分析的模态构型。利用非线性有限元弧长法对球壳受压失稳过程进行数值模拟,得到屈曲前后球壳变形情况及全过程载荷-位移曲线。计算一致缺陷模态法和N阶缺陷模态法对应的球壳屈曲临界载荷,结果表明,受压球壳对缺陷较敏感,承载能力随缺陷值增大而降低;一致缺陷模态法计算便捷,在工程应用上具有合理性,N阶缺陷模态法考虑高阶模态缺陷构型,结果更加全面,可以为工程中缺陷结构稳定性设计提供参考。
英文摘要:
      When the stability of spherical pressure hull being analyzed, nonlinearity has to be considered as well as the influence of initial imperfections. According to European Standard EN1993-1-6(2007), a method of calculation for equivalent imperfection amplitude of different fabrication tolerance quality class is proposed. Distribution of imperfections is basing on the mode form of liner bifurcation analysis. By nonlinear finite element method, stability of spherical pressure hull is simulated numerically. Deformation of spherical pressure hull before and after buckling is investigated and load-displacement curve is acquired. Critical buckling load of consistent mode imperfection method and N-order eigenvalue imperfection mode method are compared. It is showed that spherical hull is an imperfection sensitive structure and the stability decreases with the increase of imperfection amplitude. Consistent mode imperfection method is convenient and reasonable in engineering application, while N-order eigenvalue imperfection mode method considers the influence of higher mode imperfection and has more comprehensive results which can provide reference for the stability design of imperfection structure.
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