Hardening and Dynamic Recovery During Hot Compression Test of Copper Simulated as Viscoplastic Material

Abstract

The Norton-Bailey equation was used to simulate by finite elements the hardening and dynamic recovery of copper during the hot compression tests. The constants of Norton-Bailey equation were determined from the Voce-Kocks model. The simulation assumes a Mortar Contact with Coulomb friction and axial symmetry. Numerical results were compared with experiments. Six compression tests were carried out at 804 K, three with a strain rate of 0.1 s -1 and three with a strain rate of 1 s -1 . The results show: The differences between the experiments and the simulations are less than 7.69% for strain rates of 0.1 s -1 , and less than 0.67% for strain rates of 1 s -1 . This shows that the simulation of hardening and dynamic recovery of hot copper is possible with the Norton-Bailey equation. Better numerical results were obtained when the behavior of copper is typical of hardening and dynamic recovery, and this happen for high values of strain rates.

Genetic-Algorithm-Based Inverse Optimization Identification Method for Hot-Temperature Constitutive Model Parameters of Ti6Al4V Alloy

“…The phenomenological constitutive model has a simple form, fewer parameters, and can be easily integrated into the finite element software. The common ones are the Johnson–Cook (JC) model [ 12 ], the Arrhenius-type (A-T) model [ 13 ], the Fields–Bachofen (FB) model [ 14 ], the Voce–Kocks model [ 15 ], and the Hansel–Spittel model [ 16 ]. The most widely used constitutive models of this type are the JC model and the A-T model.…”