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박태욱(Tae-Uk Park),하상렬(Sangyul Ha),김기태(KiTae Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In this paper, we propose a physically-based constitutive model which considers friction and rolling resistance as well as cohesion between powder particles. We employ the classical Mohr-Coulomb model and associated flow rule as a yield condition to resolve the meso-scale deformation behavior of ceramic powder compacts. The constitutive equations are implemented into the user-subroutine VUMAT of finite element program ABAQUS/Explicit. The material parameters in the constitutive model have been identified by calibrating the model to reproduce data from triaxial compression tests and simple compression tests. The density distribution and the predicted shape obtained by using the proposed model are in good quantitative agreement with the experimental results of the cold die compaction.