摘要
板架结构作为船舶或者海洋结构的典型部件,其焊接过程导致的失稳变形是困扰建造精度和生产效率的关键问题。以常见的由纵向角钢和横向T型材构成的板架结构为研究对象。首先总结出焊接过程中的典型接头,建立实体单元模型进行热-弹-塑性有限元分析获得焊接固有变形。随后将焊接固有变形作为力学载荷,加载到板架结构壳单元模型中进行特征值分析和弹性有限元分析,研究该工艺下板架结构的焊接失稳变形特征。同时通过瞬态热拉伸工艺控制板架结构的焊接失稳变形,并研究附加热源施加位置的影响。结果表明,瞬态热拉伸能够影响典型接头的固有变形,特别是减小焊接产生的纵向收缩力。合适的位置施加附加热源可以避免板架结构产生焊接失稳变形;当附加热源施加到距离立板100 mm处的底板上,板架结构没有出现波浪变形,且面外变形峰值减小了49.3%。
Plate panel structure is a typical part of ship and marine structures.Welding induced buckling in plate panel structure is a key issue,which troubles construction accuracy and production efficiency.A common plate panel structure composed of longitudinal angle steel and transverse T-section is studied.Firstly,typical joints in the welding process are summarized,and solid element models are established for thermal elastic plastic FE analysis to obtain the welding inherent deformation.Subsequently,eigenvalue analysis and elastic FE analysis are performed to investigate the characteristics of welding induced buckling of the plate panel structure under this process when the inherent deformation is loaded into the shell element model of the plate panel structure.Meanwhile,transient thermal tensioning is used to control welding induced buckling in the plate panel structure,and the influence of location of additional heat source is studied.The results show that transient thermal tensioning can influence the inherent deformation of typical joints,and significantly reduce longitudinal shrinkage force(tendon force).Welding induced buckling can be mitigated by applying the additional heat source at an appropriate location;when it is applied to the flange plate 100 mm away from web plate,the deformation with wave shape does not appear,and the peak out-of-plane deformation is reduced by 49.3%.
作者
易斌
王江超
YI Bin;WANG Jiangchao(School of Naval Architecture and Ocean Engineering,Huazhong University of Science and Technology,Wuhan 430074)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2023年第14期64-72,共9页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(51609091,52071151)。
关键词
板架结构
焊接失稳变形
固有变形
瞬态热拉伸
弹性分析
特征值分析
plate panel structure
welding induced buckling
inherent deformation
transient thermal tensioning
elastic FE analysis
eigenvalue analysis
