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| Research on buckling behavior of the spherical pressure hull considering initial imperfections |
| Received:July 07, 2018 Revised:August 28, 2018 |
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| DOI：10.7511/jslx20180707002 |
| KeyWord:spherical pressure hull buckling behavior nonlinear finite element method European Standard EN1993-1-6(2007) mode imperfection method |
| Author | Institution |
| 罗珊 |
中国船舶科学研究中心 船舶振动噪声重点实验室, 无锡 ;常州工程职业技术学院 检验检测认证学院, 常州 |
| 王纬波 |
中国船舶科学研究中心 船舶振动噪声重点实验室, 无锡 |
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| Abstract: |
| 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. |