The FEM Simulation Of The Liquid Infiltration-Extrusion Process Including Damage For Composites

The liquid infiltration extrusion technology, as a new forming method which includes the liquid infiltration and the semi-solid extrusion, has been developed in recent years. In the process, static pressure is applied to the liquid metal directly, which makes the liquid metal solidify and crystallize under high pressure, and then undergone large plastic deformation in the semi-solid or quasi-solid state. Thus, the process can cause materials to be double-strengthened during the forming process during both stages. By means of this technology, many kinds of tube,bar,or shaped products of metal-matrix composites can be formed in the single process.In this paper, a new continuum model of fluid in porous media and the distribution resistance concept were introduced. Then, the temperature variation curves of the infiltration zone, infiltration front edge curves and depth variation curves along with time were gained from the simulation on the ANSYS / FLOTRAN code. In addition, the effects of process parameters such as fiber radius, infiltration press, volume fraction of the porous preform on the infiltration depth and the infiltration process of the liquid-metal are investigated, The results indicate that the fiber radius, infiltration pressure, liquid metal viscosity coefficient and the volume fraction of perform affect the infiltration velocity of liquid metal and the infiltration process. And this paper investigated the temperature distribution of the mould considering radiation heating, The radiation heating and extruding process were simulated using the commercial finite element code MARC, The initial distribution of temperature field is obtained from the analysis of the radiation heating, and the results were compared with that of analysis assuming that the initial temperature in the mould is uniform. Finite element analysis was accomplished and compared with the results of experiments for extruding process, which was similar to actual forming process. It concludes that the investigation on the initial temperature distribution was very important and the simulated results agree well with the experiments. this paper found the base for the analysis of thermal stress and thermal fatigue of the mold., The temperature fields, stress-strain fields for the forming process were simulated with the rigid-viscoplastic direct coupled FEM. And he damage model were built up and the simulation results conform with the test results.In this paper, the numerical simulation problem of the liquid infiltration extrusion technology that includes high pressure infiltration, heat conduction, solidification and large deformation was solved successfully, which provided theoretic basis for the parameters optimization and the application of the process.