金属材料の材質予測のための内部変数

概要

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This paper addresses internal variables for material property simulation by the thermo-elastoplastic FEM in a metal forming process. Desipite of many flow stress equations for material property prediction systems, their internal variables are not consistent with mathematics and dynamics of the continuum theory. This results in a fatal contradiction in a FEM simulation when the FEM is applied to metal forming processes of various deformation history. To overcome this problem, four mathematical requirements on internal variables are discussed, and the generalized deformation energy is proposed as the simplest internal variable that satisfies these requirements. A new constitutive equation is developed using the flow-stress equation based on the generalized deformation energy. It is applied to a thermo-elasto-plastic FEM code, and upsetting and heat treatment processes are simulated. Results show effectiveness of the new internal variable.
一般社団法人日本機械学会の論文
1998-08-25