Constitutive modelling of the flow behaviour of a β titanium alloy at high strain rates and elevated temperatures using the Johnson-Cook and modified Zerilli-Armstrong models

Zhan, Hongyi, Wang, Gui, Kent, Damon and Dargusch, Matthew (2014) Constitutive modelling of the flow behaviour of a β titanium alloy at high strain rates and elevated temperatures using the Johnson-Cook and modified Zerilli-Armstrong models. Materials Science and Engineering A, 612 71-79. doi:10.1016/j.msea.2014.06.030

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Author Zhan, Hongyi
Wang, Gui
Kent, Damon
Dargusch, Matthew
Title Constitutive modelling of the flow behaviour of a β titanium alloy at high strain rates and elevated temperatures using the Johnson-Cook and modified Zerilli-Armstrong models
Journal name Materials Science and Engineering A   Check publisher's open access policy
ISSN 0921-5093
1873-4936
Publication date 2014-08-26
Year available 2014
Sub-type Article (original research)
DOI 10.1016/j.msea.2014.06.030
Volume 612
Start page 71
End page 79
Total pages 9
Place of publication Amsterdam, The Netherlands
Publisher Elsevier
Collection year 2015
Language eng
Abstract The objectives of this work are to characterize the flow behaviour of the Ti-6Cr-5Mo-5V-4Al (Ti6554) alloy at high strain rates and elevated temperatures using the Johnson-Cook (JC) model and a modified Zerilli-Armstrong (ZA) model, and to make a comparative study on the predictability of these two models. The stress-strain data from Split Hopkinson Pressure Bar (SHPB) tests over a wide range of temperatures (293-1173K) and strain rates (103-104s-1) were employed to fit parameters for the JC and the modified ZA models. It is observed that both the JC and the modified ZA models have good capacities of describing the flow behaviour of the Ti6554 alloy at high strain rates and elevated temperatures in terms of the average absolute error. The modified ZA model is able to capture the strain-hardening behaviour of the Ti6554 alloy better as it incorporates the coupling effects of strain and temperature. However, dynamic recovery or dynamic recrystallization that may happen at elevated temperatures should be taken into consideration when selecting data set for parameters fitting for the modified ZA model. Also the modified ZA model requires more stress-strain data for the parameters fitting than the JC model.
Keyword High strain rate deformation
Johnson Cook model
Modified Zerilli Armstrong model
β Titanium alloys
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2015 Collection
 
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