Negative to positive strain rate sensitivity in 5xxx series aluminum alloys

In continuation to our previous work on 5xxx series Al alloys

Experimental and numerical investigations of yield surface, texture, and deformation mechanisms in AA5754 over low to high temperatures and strain rates
node/14353

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Here is a recently accepted manuscript in International Journal of Plasticity
Negative to positive strain rate sensitivity in 5xxx series aluminum alloys: Experiment and constitutive modeling 
http://dx.doi.org/10.1016/j.ijplas.2013.11.001

Abstract

Uniaxial tension and compression tests, at both quasi-static and dynamic ranges of loadings, are utilized to study the thermo-mechanical response of an AA5182-O sheet. A constitutive model is proposed to predict the stress–strain response of the alloy over the studied strain rate and temperature ranges. The developed model is also calibrated for another AA5xxx alloy series, AA5754-O, to evaluate the capability of the developed model in capturing transition from negative to positive strain rate sensitivity.