The temperature effect onviscoplastic constitutive spins

摘要

Within the framework of anisotropic combined viscoplastic hardening formulation, accounting macroscopically for residual stress as well as texture development at finite deformations of metals, simple shear analyses for the simulation of fixed-end torsion experiments for Al and Cu at different strain rates are reviewed with an emphasis on the role of constitutive spins. Complicated responses of the axial stresses with monotonically increasing shear deformations can be successfully described by the flexibility of orthotropic hardening part, featuring tensile axial stresses either smooth or oscillatory. Temperature effect on viscoplastic constitutive spins is investigated via the variations of ratio of plastic to total spins with shear deformations. The distortion and orientation of yield surface is also discussed with temperatures.