Stress and Strain Characteristics of Aluminum Equal Channel Angular Pressing

To investigate the stress and strain distribution characteristics of equal channel angular pressing (ECAP), rigid-plastic finite element was used to simulate the aluminum ECAP processing. The simulation results showed that equivalent stress distribution of the sample was uneven, and severe stress concentration was at the channel corner. Equivalent strain distribution of the sample was also uneven, and the deformed sample can be roughly divided as three deformation regions: the front, the middle and the end. At the region of front, the plasctic deformation was extremely uneven and the gradient value of equivalent strain was relatively large, at the region of middle, the plasctic deformation was stable and uniform, at the region of end, there existed material reverse flow the sample contacted with the plunger and bearing heavy three-dimensional compressive stress.