A constitutive model and its identification for the deformation characterized by dynamic recovery

Article Abstract:

A constitutive model representing the deformation characteristics of materials at high temperatures that undergo dynamic recovery, is shown. Hot torsion tests were performed to test the constitutive formulas. The tests were conducted with the material of AA5083 over a range of twist rate from 0.013 to 13.70 rev/s and for each twist rate at an initial temperature range of 350 to 550 degrees C, respectively. The material constants determination techniques are illustrated with suggested linear regression and the nonlinear iteration formats.

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A new approach to improve material models

Article Abstract:

Incorporation of a series of shape functions described by discrete sections instead of closed-form material functions improves the adaptation of material models to experimental data. Proper interpretation and correction of newly discovered physical properties in the material models help develop new improved models. Use of a minimum error algorithm to determine the constant value parameters also contributes to the model improvement.

Research, Algorithms

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A dislocation density based constitutive model for cyclic deformation

Article Abstract:

A viscoplastic model representing uni-directional deformation of metallic materials has been adopted for cyclic loading. The model utilizes dislocation densities as internal variables indicating the microstructural state of the material. Changes in the dislocation density caused by channel-like dislocation patterns are considered in the development of the constitutive formulas. The model is tested for INCONEL 738 LC and Alloy 800H.

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