Prediction of the Shape Changes and Microstructural Evolution in an Eulerian Analysis of Steady State Forming Process

摘要

Main objectives of the forming processes are to form the products having the shape and mechanical properties as designed. A forming process model should be able to predict the shape changes and the mechanical properties changes of a work piece. To effectively predict the shape changes in steady state forming processes, an Eulerian analysis supplemented with a free surface correction algorithm and a stream line technique is addressed. Since the mechanical properties are related directly to the microstructures of the work piece, the prediction of microstructural changes must be included in the process model. In this work, anisotropy from deformation texture and deterioration of mechanical properties due to growth of micro voids are directly coupled into the virtual work expressions for the mass and momentum balances. Applications of the proposed model to the plate rolling, hydrostatic clad extrusion and shape rolling are given and the results are discussed in detail.