基于局部-整体有限元法的薄壁筒焊接变形计算

Welding deformation predictions of thin-wall cylinders using a local-global method

焊接变形会对焊接件的应用造成很大影响,进行结构件焊接变形的高精度和高效率预测具有重要的工程意义。该文针对大型薄壁圆筒件,应用局部-整体映射法对其环焊缝的焊接过程进行了有限元分析,得到了3种不同焊接顺序下的筒体变形结果。计算结果表明:相比于环缝一段焊和环缝两段焊,对环缝分成四段焊接情况下圆筒变形量最小,其数值相比于环缝一段焊减少约17%。将局部-整体法计算结果与热弹塑性法和实验方法所得结果进行了对比,三者吻合较好,但局部-整体法的计算用时仅为热弹塑性法的约1/6。

Welding structure can be seriously affected by welding deformation. Accurate, efficient predictions of welding deformation are important in engineering projects. A local global finite element analysis is used to analyze circumferential welding of large-scale thin wall cylinders. The welding deformation of the cylinder is obtained in 3 sequences. The results show that the deformation of a 1/4 circle weld is less than for a full-circle weld and a 1/2 circle weid. The deformation of a 1/4 circle weld is about 17% less than for a full-circle weld. The local-global method results agree well with results from the therrno-elastic-plastic method and experimental data with the local global method using about 1/6 of the time of the t hermo-elastic-plastie method.