2차원 열간 단조에서의 변형과 온도의 연계 해석과 비연계 해석 비교

Abstract

The study is concerned with the comparison of coupled analysis with decoupled analysis for plastic deformation and heat transfer analysis in thermo-viscoplastic axisysmmetric or plane strain forging. A rigid-viscoplastic material is used so as to take the effect of strain rate and working temperature into account. Axisymmetric and plane strain examples for forging are chosen for computation. Analysis of deformation and heat transfer is carried out for upsetting of cylinder by both coupled and decoupled schemes in order to check whether the computation time can be saved by the decoupled analysis without impairing the accuracy of the solution. The comparison has shown that the results of the decoupled analysis are almost coincident with those of the coupled analysis. The analysis of heat transfer are carried out both by the finite element method and by the finite difference method. The distribution of temperature by the FDM is coincident with that by the FEM. The finite difference formulation by heat balance of element, however, needs large input data and is less accurate than the FE formulation, since the temperature in an element of the FDM is constant.