摘要
以热-弹塑性理论为基础,建立了10 mm厚Monel-400合金管多道轴向焊接残余应力的三维有限元模型,利用ANSYS有限元分析软件,模拟了Monel-400合金中厚壁管纵焊对接的应力分布.结果表明,在焊缝一定距离处截面的节点应力随焊接道次的增加而不断变化;外表面节点X方向的应力为拉应力,中间节点和内表面节点应力为压应力;该截面处节点的径向和轴向应力均为压应力,中间节点压应力最大;材料冷却10 s后各方向的残余应力小于材料的屈服点应力;焊接热影响区的残余应力分布有利于减少材料的应力腐蚀,提高管道的使用寿命.
A three-dimensional finite-element model of multi-pass axial welding residual stresses of 10 mm thick wall pipe of Monel-400 was proposed based on the theory of thermal-elastoplasticity. Using ANSYS finite-element program, the welding stresses of heat resistant steel were simulated. The conclusions can be drawn as follows ： within a certain range frmn the weld, node stress is a function of temperature;X direction of the outer surface of the node stress is tensile stress;stress at intermediate nodes and the inner surface nodes is compressive; nodes in radial and axial stresses are compressive stress, and the intermediate nodes become the maximum copressive stress; cqoling 10s after the end of welding, residual stresses in each direction are less than the yield point stresses of the materials;HAZ of residual stress distribution is beneficial to reducing the stress corrosion of the materials and improving the service life of the pipeline.
出处
《内蒙古科技大学学报》
CAS
2010年第1期46-48,共3页
Journal of Inner Mongolia University of Science and Technology
