A thermodynamical theory of plastic spin and internal stress with dislocation density tensor

Article Abstract:

Research was conducted to examine a thermodynamical theory of elastoplasticity by introducing the concept of dislocation density tensor based on two fundamental principles of thermodynamics, namely, maximal entropy production rate and the principle of increase of entropy. A set of thermodynamically consistent governing equations of plastic spin and back stress was proposed by associating them with the dislocation density tensor. Results indicate that to achieve a thermodynamically consistent theory for kinematic hardening, the free energy density should have the dislocation density tensor as one of its arguments.

Thermodynamics, Dislocations in crystals, Dislocations (Crystals)

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Application of the Taylor polycrystal plasticity model to complex deformation experiments

Article Abstract:

Research was conducted to determine the applicability of the Taylor polycrystal plasticity model to three-dimensional simulations of oxygen free high conductivity copper. Stress-strain and texture data derived from finite element simulations were analyzed. Results showed the accuracy of predicting compression stress-strain behavior. However, inaccuracy was observed with regard to compressive stress-strain behavior and deformation response.

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Yield strength asymmetry predictions from polycrystal elastoplasticity

Article Abstract:

Research was conducted to quantify the effect of the linking assumption on the predicted polycrystalline Bauschinger effect, a term used to indicate deformation-induced asymmetry in yielding with respect to the sign of the applied stress. Results demonstrate that the strength of the predicted Bauschinger effect does depend on the linking assumption, with 'compatibility first' models developing stronger yield strength asymmetries.

Finite element method

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