Design Parameters for Equal-Channel Angular Pressing (ECAP) Via Numerical Approach

Abstract

A numerical approach utilizes to investigate the optimal die design parameters of the ECAP technique. The Deformation behavior and strain distribution are affected by die geometry and processing parameters. were analyzed and evaluated. In addition, the influence of the inner channel angle (ICA) and the outer channel angle (OCA) on the behavior of plastic deformation during ECAP process also studied using a finite element technique. The numerical investigation implemented over a range of die angles (90°, 110°, and 135°) with inner corner radius (0, 3, 4, 5, and 8 mm) with their corresponding values considered for the outer corner radius (0, 10, 12,14,15 and 20 mm). The results obtained regarding the force required, maximum stress, maximum strain, and equivalent stress evaluated over a range for die inner angle radius and die outer angle radius. These results show that the size of the inner and outer curvature radii has a big effect on deformation homogeneity of the billet. had an influence on both the quantity and distribution of effective strain. With the increment of inner and outer curvature radii, the effective strain value decreased in the deformation regions. Moreover, the optimum conditions in terms of strain distribution and homogeneity of billet are associated with a radius of the inner fillet of 4 mm and radius of outer corner of 12 mm. The impacts on the von Mises strain and the press force. The optimal compromise between applied force and von Mises strain balances small press forces and high von Mises strain and homogeneity indices.