Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 619, Issue -, Pages 186-194Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.09.002
Keywords
Strain rate; Constitutive relation; Johnson-Cook model; 7075-T6 aluminum alloy; Experiment
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The dynamic mechanical behaviors of 7075-T6 aluminum alloy at various strain rates were measured by dynamic tensile tests using the electronic universal testing machine, high velocity testing system and split Hopkinson tensile bar (SHTB). Stress-strain curves at different rates were obtained. The results show that the strain rate hardening effect of 7075-T6 aluminum alloy is significant. By modifying the strain rate hardening term in the Johnson-Cook constitutive model, a new Johnson-Cook (JC) constitutive model of 7075-T6 aluminum alloy was obtained. The improved Johnson-Cook model matched the experiment results very well. With the Johnson-Cook constitutive model, numerical simulations of tensile tests at different rates for 7075-T6 aluminum alloy were conducted. According to tensile loading and stress-strain relation of 7075-T6 aluminum alloy, calculation results were compared with experimental results. Accuracy of the modified Johnson-Cook constitutive equation was further proved. (C) 2014 Elsevier B.V. All rights reserved.
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