稳态热加载对筒状结构变形和应力影响的研究

焊接热源分别采用双椭球和整条焊缝两种稳态热加载,得到了筒状结构的焊后变形和残余应力分布,并进行了试验验证。结果表明:两种加载方式焊后变形和应力趋势相同。整条焊缝加载峰值出现在两封口板中心位置,峰值为4.931 mm,与试验结果对比误差小。应力峰值相近,峰值近似339 MPa。采用双椭球热源加载,应力分布与试验结果吻合更好。仿真与试验结果误差均能满足工程应用要求,证明了模拟结果的准确性。双椭球热源加载的计算时间是整条焊缝加载的27.2倍,从工程应用层面分析,整条焊缝加载具有重大的使用价值。

Influence of steady-state thermal loading modes on deformation and stress of tubular structure

Two kinds of steady-state thermal loading of double ellipsoid heat source and entire weld seam were used to obtain the deformation and stress distribution of tubular structure, and verified by experiments. The results show that welding deformation and stress with the two kinds of loading mode have the same trend. The peak of welding deformation at entire seam loading is located in the middle of the seal plate. The peak value is 4.931 mm. Welding deformation at entire seam loading is close to experimental results. The peak of stress is similar, and the peak value is about 339 MPa, and close to experimental results. The simulation results meet the requirement of engineering application. It proved accuracy of the simulation results. The calculation time of double ellipsoid heat source loading is 27.2 times of entire seam loading. Considering engineering applications, entire seam loading has great use value in numerical simulation.