Effect of Channel Inner Angle on Aluminum ECAP Plastic Deformation

Rigid-plastic finite element was used to investigate the effect of channel inner angle on aluminum ECAP processing. The simulation results demonstrate that distribution of maximum principal stress was non-homogeneous no matter with 90° inner angle or 120° inner angle. For the both inner angle values, material located at the front-end of workpiece flow easily and material located at the top of die channel corner flow difficultly, which were well agreed with plastic mechanics and experiment. The inhomogeneity of maximum principal distribution in ECAP workpiece processed with die channel inner angle of 90° was more severe than that with die channel inner angle of 120°.