焊接初始缺陷对船体梁极限强度的影响
Effect of welding initial imperfections on the ultimate strength of hull girder
崔虎威 1胡润文 2陈泽民 2黄路3
作者信息
- 1. 重庆交通大学 航运与船舶工程学院,重庆 400074;内河航运技术湖北省重点实验室,湖北 武汉 430063;重庆高新开发建设投资集团有限公司,重庆 401329
- 2. 重庆交通大学 航运与船舶工程学院,重庆 400074
- 3. 中国舰船研究设计中心,湖北 武汉 430064
- 折叠
摘要
[目的]旨在更准确地评估船体梁的总纵极限强度并获取其崩溃失效过程.[方法]采用非线性有限元软件ABAQUS,对某双底散货船船体梁进行细致建模,充分考虑轻微、平均、严重这 3 种水平焊接初始变形与平均水平焊接残余应力对中拱、中垂弯矩下船体梁极限强度的影响.[结果]计算结果表明,随着焊接初始变形幅值的增加,船体梁的极限强度与抗弯刚度逐步减小;严重水平的焊接初始变形使得某双底散货船船体梁极限强度最高下降了 14.25%;在焊接残余应力的单独影响下,某双底散货船船体梁极限强度最高下降了 8.22%;焊接初始变形与残余应力对船体梁极限强度的综合影响并非两种初始缺陷单独影响的线性叠加.[结论]在船体梁极限强度研究中,有必要更仔细考虑焊接初始变形与残余应力对船体梁极限强度的综合影响.
Abstract
[Objectives]The aim of this paper is to evaluate the longitudinal ultimate strength of a hull girder more accurately and determine its collapse process.[Methods]A bulk carrier is finely modeled in nonlinear finite element software ABAQUS,and the effects of slight,average,and severe welding initial de-formations and average welding residual stress on the ultimate strength of the hull girder under hogging and sagging bending moments are fully considered.[Results]The calculation results show that the hull girder's ultimate strength and bending stiffness decrease gradually with the increase of the initial deformation amp-litude.Severe welding initial deformation makes the ultimate strength of the bulk carrier decrease by 14.25%,and the bulk carrier's ultimate strength decreases by up to 8.22%under the effect of welding residual stress in-dividually.The combined effect of welding initial deformation and residual stress on the hull girder's ultimate strength is not a linear combination of the effects of the two initial deformations individually.[Conclusions]The combined effect of welding initial deformation and residual stress on a hull girder's ultimate strength should be considered more carefully in research on the ultimate strength of hull girders.
关键词
船体梁/结构分析/极限强度/焊接初始变形/焊接残余应力/有限元法/ABAQUSKey words
hull girders/structural analysis/ultimate strength/welding initial deformation/welding resid-ual stress/finite element method/ABAQUS引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据