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Abstract
Three types of duplex compaction process have been simulated by the finite element method using a backward Euler method and a yield criterion, which can describe the densification behaviour of ceramic powder. The effects of two parameters in the yield criterion on the uniaxial compaction curve are examined. The friction force during a combination of inner and outer compaction can be significantly reduced by an intentional clearance between the inner and outer compacts. The calculated shape of duplex compacts and density distribution show good agreement with experimental results using ZrO2 powder. A height difference between inner and outer compacts after combination disappears by friction force reduction.