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온간금형 압축시 구리 분말의 치밀화에 대한 알루미늄 몰드의 영향
박태욱(TaeUk Park),이성철(SungChul Lee),김기태(KiTae Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Densification behavior of copper powder was investigated to study the effect of an aluminum mold under warm pressing. The low flow stress of an aluminum mold is appropriate to apply hydrostatic stress to powder compacts during compaction under high temperature. The suggested P/M process is very useful under high temperature since copper powder compacts have higher relative density over axial stress of 100 ㎫ and show more homogeneity as compared with conventional warm pressing. Elastoplastic constitutive equation proposed by Shima and Oyane was implemented into a finite element program (ABAQUS) for densification behavior under warn pressing by using a metal mold. Finite element results agreed well with experimental data for densification and deformation of copper powder compacts in the mold.
하상렬(Sangyul Ha),박태욱(TaeUk Park),김기태(KiTae Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
In this paper, we developed a physically-based micromechanical model for inelastic deformation of ceramic powders. The aggregate response of ceramic particles was modeled using the two-surface yield function which considered the shear-induced dilatancy caused by friction, rolling resistance and cohesion between powder particles and consolidation caused by plastic deformation of powder themselves under high compression. The constitutive equations were implemented into the user-subroutine VUMAT of finite element program ABAQUS/Explicit. The material parameters in the constitutive model were identified by calibrating the model to reproduce data from triaxial compression tests and simple compression tests. The density distribution obtained by using the proposed model was in good quantitative agreement with the experimental results of the triaxial compression and cold isostaic compression as well.
온간금형 압축시 구리 분말의 치밀화에 대한 알루미늄 몰드의 영향
이성철(Sungchul Lee),박태욱(Taeuk Park),김기태(Kitae Kim) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.4
Densification behavior of copper powder was investigated to study the effect of an aluminum mold under warm pressing. The low flow stress of an aluminum mold is appropriate to apply hydrostatic stress to powder compacts during compaction under high temperature. The suggested powder metallurgy process is very useful under high temperature since copper powder compacts have higher relative density over axial stress of 100 MPa and show more homogeneity as compared with conventional warm pressing. Elastoplastic constitutive equation proposed by Shima and Oyane was implemented into a finite element program (ABAQUS) for densification behavior under warn pressing by using a metal mold. Finite element results agreed well with experimental data for densification and deformation of copper powder compacts in the mold.