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;基于线性特征值分析的模态构型给出初始缺陷的分布。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。
When the stability of a spherical pressure hull being is analyzed,nonlinearity has to be considered as well as the influence of initial imperfections.According to European Standard EN1993-1-6(2007),a method for calculating equivalent imperfection magnitude of different fabrication tolerance quality classes is proposed.The distribution of imperfections is determined based on the mode form of liner bifurcation analysis.By means of a nonlinear finite element method,the stability of a spherical pressure hull is simulated numerically.Deformation of spherical pressure hull before and after buckling is investigated and load-displacement curve is acquired.The critical buckling loads from consistent mode imperfection method and N-order eigenvalue imperfection mode method are compared.It is shown that a spherical hull is an imperfection-sensitive structure and the stability decreases with the increase of imperfection magnitude.Consistent mode imperfection method is convenient and reasonable in engineering applications,while N-order eigenvalue imperfection mode method considers the influence of higher-mode imperfection and produces more comprehensive results which can provide a reference for the stability design of imperfect structures.
作者
罗珊
王纬波
LUO Shan;WANG Wei-bo(National Key Laboratory on Ship Vibration&Noise,China Ship Scientific Research Center,Wuxi 214082,China;School of Inspection and Testing Certification,Changzhou Vocational Institute of Engineering,Changzhou 213164,China)
出处
《计算力学学报》
EI
CAS
CSCD
北大核心
2019年第4期498-504,共7页
Chinese Journal of Computational Mechanics
基金
国家重点研发计划(2016YFC0304303)
江苏省高职院校青年教师企业实践培训(2018QYSJ006)
常州工程职业技术学院校科研基金资助项目
