摘要
针对大型厚壁焊接结构尺寸大、焊接时间长,以及有限元计算需要耗费大量时间和空间的特点,基于ANSYS有限元软件,建立了简化焊道数、简化移动热源及两者都简化的多道焊过程应力有限元快速预测模型.针对厚度达125 mm的筒体斜插弯管接头,分别采用3种简化模型预测了其残余应力及过程应力的演化特征,得出了3种简化模型在进行大型厚壁结构多道焊过程应力预测中的异同.结果表明:采用简化焊道数的方法计算接头应力,在焊道填充方向的误差大于简化移动热源的方式;当研究相同焊道平面内的应力状态时,简化移动热源的方式比简化焊道数具有更大误差.这是因为简化移动热源,会增大接头的过程应力峰值,而简化焊道数,对于焊道数较多、焊接时间较长的接头的过程应力可能具有更大的影响.
Facing a huge memory space and long calculating period in finite element calculation for large thick-wall welded structure,three predictor models based on software ANSYS with simplification of bead number,moving heat source,and both of them respectively are presented.Under the three simplifications,the residual stress and the process stress of the welded cylinder with angle-inserting elbow and thickness of 125 mm are evaluated,and as a result,the similarities and differences for the welding stress are obtained.It shows that the residual stress in simplified bead model has greater error than that by simplified moving heat source model in direction of bead filled,and the stress in simplified moving heat source model has greater error than that by simplified bead model in the same bead plane.The process peak stress increases in case of simplified moving heat source model,and the process stress of the joint with many beads or a very long welding time is affected more significantly by the simplified bead model.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2010年第3期68-71,共4页
Journal of Xi'an Jiaotong University
基金
国家自然科学基金资助项目(50875200)
关键词
大型厚壁
快速预测
过程应力
large thick-wall
fast prediction
stress evolution
