An Isotropic Model for Cyclic Plasticity Calibrated on the Whole Shape of Hardening/Softening Evolution Curve

This work presents a new isotropic model to describe the cyclic hardening/softening plasticity behavior of metals. The model requires three parameters to be evaluated experimentally. The physical behavior of each parameter is explained by sensitivity analysis. Compared to the Voce model, the propose...

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Bibliographic Details
Published inMetals (Basel ) Vol. 9; no. 9; p. 950
Main Authors Srnec Novak, Jelena, De Bona, Francesco, Benasciutti, Denis
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.09.2019
Subjects
Algorithms
Alloys
Copper base alloys
cyclic plasticity
Error analysis
Evolution
Hardening
hardening/softening
isotropic model
kinematic model
Kinematics
Mathematical models
Metal fatigue
Numerical analysis
Parameter sensitivity
Plastic properties
Sensitivity analysis
Softening
Steel
Yield stress
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Summary:This work presents a new isotropic model to describe the cyclic hardening/softening plasticity behavior of metals. The model requires three parameters to be evaluated experimentally. The physical behavior of each parameter is explained by sensitivity analysis. Compared to the Voce model, the proposed isotropic model has one more parameter, which may provide a better fit to the experimental data. For the new model, the incremental plasticity equation is also derived; this allows the model to be implemented in finite element codes, and in combination with kinematic models (Armstrong and Frederick, Chaboche), if the material cyclic hardening/softening evolution needs to be described numerically. As an example, the proposed model is applied to the case of a cyclically loaded copper alloy. An error analysis confirms a significant improvement with respect to the usual Voce formulation. Finally, a numerical algorithm is developed to implement the proposed isotropic model, currently not available in finite element codes, and to make a comparison with other cyclic plasticity models in the case of uniaxial stress and strain-controlled loading.
ISSN:2075-4701
2075-4701
DOI:10.3390/met9090950