摘要
【目的】该文旨在研究波形钢腹板梁的焊接温度场变化及残余应力分布。【方法】通过数值模拟和试验研究对实际工程中波形钢腹板梁焊接残余应力进行了估算和分析,建立了波形钢腹板梁三维热弹塑性有限元模型。通过Fortran语言编制Dflux子程序,定义了焊接路径及热源模型。采用顺序耦合法,先后计算了焊接温度场和应力应变场,并对应力场最终结果即焊接残余应力分布进行了分析,最后与残余应力测试试验结果比较。【结果】结果表明,以上焊接数值模拟方法可行,即实际测试结果与波形钢腹板梁有限元模拟计算得到的焊接残余应力分布趋势比较接近。【结论】在焊缝附近波形钢腹板梁焊接残余应力接近屈服强度,且在相同热输入下,上下翼缘板因板厚不同,产生的残余应力大小及分布也不同。
[Objective]The aim of this paper was to study variation of welding temperature field and residual stress distribution of corrugated web girders.[Methods]Through numerical simulation and experimental research,welding residual stress of corrugated steel web girders in practical engineering was estimated and analyzed.A three-dimensional thermal elastic-plastic finite element model was established.Dflux subroutine was compiled by Fortran language to define welding path and heat source model.Welding temperature field and stress field of corrugated web girders were obtained by sequential coupling method.The final result of stress field,namely distribution of welding residual stress,was analyzed and finally compared with test results of residual stress.[Results]The results showed that trend of welding residual stress of the model was close to experimental test,which proved the correctness of numerical simulation method used in welding.[Conclusion]Welding residual stress of corrugated web girders near weld was close to yield strength.Residual stress of the upper and lower flanges varied in size and distribution due to different thickness under the same heat input.
作者
呼昭灯
冀伟
姜红
Hu Zhaodeng;Ji Wei;Jiang Hong(Lanzhou Jiaotong University,Lanzhou 730070,China;China Design Group Co.,ltd.,Nanjing 210014,China;Gansu Borui Traffic Heavy Equipment Manufacturing Co.,Ltd.,Lanzhou 730087,China)
出处
《焊接》
2024年第7期58-66,共9页
Welding & Joining
基金
甘肃省重点研发计划-工业类项目资助(23YFGA0043)
兰州市人才创新创业项目(2021-RC-39)。
关键词
波形钢腹板梁
数值模拟
焊接残余应力
热力学
corrugated web girders
numerical simulation
welding residual stress
thermodynamics
