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A constitutive model for high strain rate deformation in FCC metals based on irreversible thermodynamics

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>09/2009
<mark>Journal</mark>Mechanics of Materials
Issue number9
Number of pages7
Pages (from-to)982-988
Publication StatusPublished
<mark>Original language</mark>English


The present work extends a recent model for plastic deformation of polycrystalline metals based on irreversible thermodynamics. A general dislocation evolution equation is derived for a wide range of strain rates. It is found that there is a transitional strain rate (∼103 s-1) over which the phonon drag effects play a dominant role in dislocation generation resulting in a significant raise in the dislocation density and flow stress. The model reduces to the classical Kocks-Mecking model at low strain rates.