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Analysis of Three Dimensional Equal Chanel Angular Pressing by Using the Finite Element Method in Conjunction with the Dislocation Cell Based Constitutive Model  

Yoon, Seung Chae (Research and Development Team Danjin Works, Hyundai HYSCO)
Kim, Hyoung Seop (Department of Materials Science and Engineering, Pohang University of Science and Technology)
Publication Information
Korean Journal of Metals and Materials / v.47, no.11, 2009 , pp. 699-706 More about this Journal
Abstract
Deformation behavior of pure aluminum during equal channel angular pressing (ECAP) was simulated using a three-dimensional version of the finite element method in conjunction with a constitutive model based on the dislocation density and cell evolution. The three-dimensional finite element analyses for the prediction of microstructural features, such as the variation of the dislocation density and the cell size with the number of ECAP, are reported. The calculated stress and strain and their distributions are also investigated for the route Bc ECAP processed pure aluminum. The results of finite element analyses are found to be in good agreement with experimental results for the dislocation cell size. Due to the accumulation of strain throughout the workpiece and an overall trend to saturation in cell size, a decrease of the difference in cell size with the number of passes (1~4) was predicted.
Keywords
equal channel angular pressing; microstructure based constitutive model; dislocation cell model; three dimensional finite element method;
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