On the die corner gap formation in equal channel angular pressing

Finite Element Analysis of Copper Deformed By Conventional Forward Extrusion

“…When α= 0º, the simulations resulted in considerable amount of non-uniform deformation as occurred in previous finite element and physical modelling (i.e., [4,5,[6][7][8]). The results, however, are quite different from the plasticise experimental results, which showed uniform deformation with α =30º (i.e., [7]).…”

“…The analysis was carried out on φ=90º, and ψ=0º by channel angle (φ) 90 degrees in frictionless condition, for a specific die geometry (φ=90º and α=30º) also has been applied two different friction coefficient (μ=0, 0.1). In contrast to the different and single 'α' angles considered in the earlier works (i.e., [4,5,[6][7][8][9][10][11]). The commercial finite element code, Abaqus/CAE 6.11-3, was used to carry out the simulations.…”

“…The FEA results on aluminium alloy showed that the channel angle, 'φ' equal to 90° is essential to achieve ultrafine microstructure with equated grains, separated by high angle grain boundaries in minimum number of passes (i.e., [6]). At the same time the physical and finite element modelling of ECAE-CE with (φ = 90 and ψ = 0) showed non-uniform deformation in the processed material, dead metal zone formation and generation of excessive die stresses (i.e., [4,5,[7][8]). This non-uniform deformation is also observed with φ > 90 [8,9].…”

“…Physical, finite element modelling techniques have been used to study the influence of φ and on ECAE-CE process (i.e., [5,[6][7][8][9][10][11]). The FEA results on aluminium alloy showed that the channel angle, 'φ' equal to 90° is essential to achieve ultrafine microstructure with equated grains, separated by high angle grain boundaries in minimum number of passes (i.e., [6]).…”

Deformation behaviour of pure aluminium during multi-pass equal channel angular pressing through route #C

“…5a. It has been reported that the corner gap or corner angle made by the work piece is influenced by a number of factors such as friction [14,10], back stress [9], deformation speed [25], strain hardening rate [10,26]. Although a corner angle (ψ) of 16…”