| An investigation to HPT of copper disk using finite element method |
| Paper ID : 1421-UFGNSM-FULL |
| Authors: |
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Seyed Amin Hosseini Kahnooj *1, Hossein Alimohammadi1, Majid Vaseghi2, Mahmood Sameezadeh2 1Department of Mechanical and Energy Engineering, AC, Shahid Beheshti University, Tehran 16765–1719, Iran 2Department of Mechanical and Energy Engineering, AC, Shahid Beheshti University, Tehran 16765–1719, Iran |
| Abstract: |
| . Many severe plastic deformation processes have been developed to get the ultra-fine grain (UFG) structures of materials. High pressure torsion (HPT) is a reasonably new method of processing bulk nanostructured materials. Nanostructures of materials could be formed both by the consolidation of nano powders and the reļ¬nement of the coarse grained microstructures using SPD. Since the mechanical properties of the deformed material are directly related to the amount of plastic deformation, i.e. the developed strain, understanding the phenomenon associated with strain development is very important in severe plastic deformation processes. In this paper, finite element method was applied for investigating the strain inhomogeneity of workpieces during the high pressure torsion. The finite element analyzes performed of disks with 5 mm in radius and varied initial thickness of 2 mm, 3mm and 4 mm. In this simulation, the pressures of 1 GPa, 2 GPa and 4 GPa with various revolution of 0.5, 1 and 2 was applied. Simulation results demonstrated that the effect of the material condition, the disk aspect ratio and the effect of friction between the disks and the anvil walls are the most important variables. The results were shown that by increasing the pressure and the number of turns, the strain inhomogeneity in the edge of processed disks increased and strain homogeneity in disk with 4 mm in thickness was higher than disks with 2 mm and 3 mm in thickness |
| Keywords: |
| Finite element method; High pressure torsion; Severe plastic deformation |
| Status : Paper Accepted (Oral Presentation) |
