Plastic flow characteristics and physically‐based constitutive modelling of commercially pure vanadium

Abstract

Uniaxial compression tests of a commercially pure vanadium were performed by using a material testing machine and the split Hopkinson bar technique. True strains exceeding 50% are achieved over a range of strain rates from 0·001 to about 8000 s⁻¹, and temperature ranges from 77 to 800 K. The microstructures of the deformed and undeformed samples were observed by an optical microscope. Plastic flow responses and characteristics were obtained. Based on the mechanism of dislocation kinetics, a physically based model is developed.

Keywords:

• Constitutive modelling
• Dynamic strain aging
• Strain rate
• Temperature
• Vanadium

This work is supported by National Natural Science Fund of China (grant no. 10872169) and by State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology (grant no KFJJ08‐11). The authors also thank the support from Major State Basic Research Development Program (973 program) (grant no. 613116).