Error estimation, double mesh as well as fore-and-aft process program are applied in the rigid-viscous-plastic finite element simulation of tube unsteady extrusions. By the error estimation, mesh can be reasonably divided. The double mesh includes analytical mesh and material mesh. The analytical mesh is used in the finite element analysis. The material mesh is used in the recording of distortion history. The fore-and-aft process program is used in the input-output of data and computer drawing. In the results, analytical meshes, distorted material meshes and strain contours are mapped by computer.
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