热源加载方式对大型结构件变形和应力影响的研究

对大型结构件压轮的焊接过程进行数值模拟,分别采用双椭球热源和分段热源两种加载方式,得到了焊后压轮的变形和应力分布,同时采用三坐标和盲孔法残余应力测试仪进行了试验验证。结果表明：两种加载方式焊接变形趋势相同,双椭球热源加载焊后变形峰值小,其值为4.179mm；应力分布趋势相同,在焊缝位置附近应力较大,且应力峰值相同,峰值为338.6MPa。两种加载方式的焊接变形和应力与试验结果误差均能控制在30%以内,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分段热源加载的7.2倍,综合计算效率和精度考虑,分段热源加载在大型结构件计算具有重大的使用价值。

Study on the influence of heat resource loading modeson deformation and stress of large parts

Numerical simulation of the large part pressing wheel welding process, using double ellipsoid heat source and segmented source of two kinds of loading mode, it obtains deformation and stress distribution of the pressure wheel, and tests using three coordinates and blind-hole method. The results show that welding deformation in the two kinds of loading mode has the same trend. The peak of welding deformation in double ellipsoid heat source is small, and the value is 4.179mm. The stress distribution has the same trend, and stress is great near the weld position. The peak of stress is same, and the peak value of 338.6MPa. The welding deformation and stress in two kinds of loading modes can be controlled within 30%, which meets the requirement of engineering application. It proved accuracy of the simulation results. The calculation time of loading double ellipsoid heat source is 7.2 times of loading the segmented heat source. Considering the computational efficiency and accuracy, it has great use value in numerical simulation of large parts.