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

✍ Scribed by Mingxin Huang; Pedro E.J. Rivera-Díaz-del-Castillo; Olivier Bouaziz; Sybrand van der Zwaag

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 289 KB
• Volume: 41
• Category: Article
• ISSN: 0167-6636
• DOI: 10.1016/j.mechmat.2009.05.007

✦ Synopsis

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 ($10 3 s À1 ) 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.