焊管2024，Vol.47Issue(12)：58-67,10.DOI:10.19291/j.cnki.1001-3938.2024.12.009
基于热弹塑性有限元法的加筋板初始缺陷与极限强度研究
Research on Initial Imperfections and Ultimate Strength of a Stiffened Plate under Thermal Elastic-plastic Finite Element Method
摘要
Abstract
In order to investigate the influence of rigid welding boundary conditions on the deformation,residual stress and ultimate strength of a stiffened plate after welding.Based on thermal elastic-plastic finite element method,a stiffened plate was simulated by Abaqus software under different welding boundary conditions.The deformation and residual stress of the stiffened plate after welding were applied to the model as initial imperfection,and the ultimate strength was calculated.When the stiffened plate is welded under rigid welding boundary conditions,the deflection deformation of the plate is small,the transverse residual stress is large,the lateral-torsional buckling of the stiffener is large,and the ultimate strength is small.Under the free welding boundary condition,the deflection deformation of the plate is large,the longitudinal residual stress is small,the lateral-torsional buckling of the stiffener is small,and the ultimate strength of the stiffened plate is large.The difference of ultimate strength of stiffened plates is small under different rigid constraints.The rigid welding boundary conditions have great influence on the post-welding deformation and the transverse and longitudinal residual stress of the stiffened plate,but little influence on the ultimate strength.The failure mode of the stiffened plate is the failure of the stiffener under compression load.Combined with the influence of welding residual stress,the influence of deflection deformation on the ultimate strength of the stiffened plate is weakened,and the ultimate strength of the stiffened plate is the highest under the free welding boundary condition.关键词
加筋板/极限强度/热弹塑性有限元法/焊接边界条件/残余应力Key words
stiffened plate/ultimate strength/thermal elastic-plastic finite element method/welding boundary conditions/residual stress分类
矿业与冶金引用本文复制引用
刘双,崔虎威,郑学键,申一帆,蓝松..基于热弹塑性有限元法的加筋板初始缺陷与极限强度研究[J].焊管,2024,47(12):58-67,10.基金项目
国家自然科学基金项目"循环载荷下基于弹性安定临界状态的船体梁极限强度研究"(项目编号52001040) （项目编号52001040）
重庆市教委科学技术研究项目"基于增量热弹塑性理论的船体结构极限强度研究"(项目编号KJZD-K202300710) （项目编号KJZD-K202300710）
重庆市自然科学基金面上项目"基于弹性安定临界状态的船体加筋板极限承载性能研究"(项目编号cstc2021jcyj-msxmX0944). （项目编号cstc2021jcyj-msxmX0944）
