Upper-bound and finite-element analyses of non-isothermal ECAP

摘要: Abstract In this paper, the thermomechanical properties of pure tantalum described by Liang and Khan [Int. J. Plast. 15 (1999) 963] through Johnson–Cook hardening law were used to propose a non-isothermal solution for estimating temperature increasing during single-pass equal channel angular pressed metallic materials. The pressing force was determined with upper-bound models developed Perez Luri [Mech. Mater. 40 (2008) 617] extended elastic-plastic materials isotropic criteria von Mises Drucker. plane-strain finite-element done program ABAQUS/Explicit provide force, P , effective plastic strain, e ¯ p along workpiece also validate proposed analytical solutions. By using Drucker's criterion, theoretical analyses showed that decreasing sample increment, Δ T primarily affected higher values die channels intersection angle, Φ moderately its initial tooling outer fillet radius, R . Also, more sensible greater inner radii, superior velocities, V 0 addition, dropped elevated temperatures. For  = 90°, confirmed 0 mm ≤   ≤ 5 mm their 10 mm/s ≤   ≤ 20 mm/s. Lastly, comparing numerical results solutions could be validated.