From the feature of the force and deformation of the tpih , 5 different elements are used to mesh the different zones of the tube , which are structural beam 3d elastic 4 , structural pipe plastic straight 20 , structural pipe elastic elbow 18 , structural shell elastic 4 node 63 and contact 3d pt - to - surf 49 ; the contact problem is assumed to be flexible - to - flexible ; the temperature field is assumed to be body load . a mechanical model corresponding to reality has been established for numerical simulation . based on the above , the 3 - d fem numerical simulation of tpih has been carried out by using the ansys program 针对加热弯管过程的受力和变形特点，采用三维梁单元、三维塑性直管单元、三维弹性曲管单元、三维壳单元与三维点对面接触单元等5种不同的单元分别对管毛坯不同区域进行划分，并对接触单元采用柔体-柔体的处理方法，将温度场作为体载荷处理，建立了符合实际的加热弯管问题数值模拟力学模型：在此基础上，应用商用软件ansys对加热弯管过程进行三维有限元模拟与研究，获得了成形时推力、弯矩、支撑力大小及其变化趋势。
