Abstract: The forming process of liquid-solid extinsion com-posite tubes is simulated by means of thermal rigid-plastic quasi-coupled FEM to revea! Its plastic deformation behavior, According to the FEM simulation system software, the stress-strain field, the temperarure field and the deformation pressure (ire obtained by the re-meshing technology, and the relative problems, including the stress-strain constitutive relation, simplified method for the liquid ?re? in the deforming body, are analyzed. The com-parison of the numerical simulation results and the experiments validated the reliability of the system, which provided a theoretic basis for the assurance of the product forming quality and the rational choiee of the technology parameters.

Key words: Numerical simulation Composite tubes, Liquid-solid extrusion FEM Semi-solid state