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Constitutive modelling of high strength titanium alloy Ti-6Al-4 V for sheet forming applications at room temperature

Badr, Ossama Mamdouh, Barlat, Frédéric, Rolfe, Bernard, Lee, Myoung-Gyu, Hodgson, Peter and Weiss, Matthias 2016, Constitutive modelling of high strength titanium alloy Ti-6Al-4 V for sheet forming applications at room temperature, International journal of solids and structures, vol. 80, pp. 334-347, doi: 10.1016/j.ijsolstr.2015.08.025.

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Title Constitutive modelling of high strength titanium alloy Ti-6Al-4 V for sheet forming applications at room temperature
Author(s) Badr, Ossama Mamdouh
Barlat, Frédéric
Rolfe, BernardORCID iD for Rolfe, Bernard orcid.org/0000-0001-8516-6170
Lee, Myoung-Gyu
Hodgson, Peter
Weiss, MatthiasORCID iD for Weiss, Matthias orcid.org/0000-0002-1845-6343
Journal name International journal of solids and structures
Volume number 80
Start page 334
End page 347
Total pages 14
Publisher Pergamon Press
Place of publication Oxford, Eng.
Publication date 2016-02
ISSN 0020-7683
1879-2146
Keyword(s) Ti-6Al-4 V
yield surface
constitutive model
Bauschinger effect
Summary To enable the design and optimisation of forming processes at room temperature the material behaviour of Ti-6Al-4 V needs to be accurately represented in numerical analysis and this requires an advanced material model. In particular, an accurate representation of the shape and size of the yield locus as well as its evolution during forming is important. In this study a rigorous set of experiments on the quasi-static deformation behaviour of a Ti-6Al-4 V alloy sheet sample at room temperature was conducted for various loading conditions and a constitutive material model developed. To quantify the anisotropy and asymmetry properties, tensile and compression tests were carried out for different specimen orientations. To examine the Bauschinger effect and the transient hardening behaviour in - plane tensile - compression and compression - tensile tests were performed. Balanced biaxial and plane strain tension tests were conducted to construct and validate the yield surface of the Ti-6Al-4 V alloy sheet sample at room temperature. A recently proposed anisotropic elastic-plastic constitutive material model, so-called HAH, was employed to describe the behaviour, in particular for load reversals. The HAH yield surface is composed of a stable component, which includes plastic anisotropy and is distorted by a fluctuating component. The key of the formulation is the use of a suitable yield function that reproduces the experimental observations well for the stable component. Meanwhile, the rapid evolution of the material structure must be captured at the macro - scale level by the fluctuating component embedded in the HAH model. Compared to conventional hardening equations, the proposed model leads to higher accuracy in predicting the Bauschinger effect and the transient hardening behaviour for the Ti-6Al-4 V sheet sample tested at room temperature.
Language eng
DOI 10.1016/j.ijsolstr.2015.08.025
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2015, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30083933

Document type: Journal Article
Collection: Institute for Frontier Materials
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