An anisotropic elastic-plastic constitutive model for single and polycrystalline metals. II—Experiments and predictions concerning thin-walled tubular OFHC copper

Dedicated to the memory of Professor James F. Bell.
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Abstract

Predictions based on an anisotropic elastic-plastic constitutive model proposed in the first part of this paper are compared with the experimental stress and strain data on OHFC copper under first torsion to about 13% and partial unloading, and then tension-torsion to about 10% along eight different loading paths. This paper also describes the deformation and stress of the thin-walled tubular specimen under finite deformation, the numerical implementation of the model, and the detailed procedure for determining the material parameters in the model. Finally, the model is extended to a general representation of the multiple directors, and the elastic-viscoplastic extension of the constitutive model is considered.

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Cited by (14)

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    Citation Excerpt :

    In order to reduce computation time, micro–macro FE models with analytical macroscopic yield locus have been investigated. A first option is to develop new macroscopic elasto-plastic or elasto-visco-plastic models with general features imbued from plasticity models in single crystals (Aifantis, 1987; Ning and Aifantis, 1996; Khan and Cheng, 1996, 1998). In this case, no microscopic model is coupled with the macroscopic FE model.

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Visiting scholar; permanent address: Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, People's Republic of China.

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