Dynamic necking of a near α titanium alloy at high strain rates: Experiments and modelling

The tensile behaviour of near α Ti3Al2.5 V alloy, conceived for applications in aerospace and automotive engineering, is characterized from quasi-static to high strain rates. The material is found to present noticeable strain rate sensitivity. The dynamic true strain rate in the necking cross-sectio...

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Bibliographic Details
Published in:Defence technology 2021-08, Vol.17 (4), p.1126-1134
Main Authors: Zhang, Long-hui, Pellegrino, Antonio, Petrinic, Nik
Format: Article
Language:English
Subjects:
Constitutive modeling
Finite element simulation
High strain rate
Locking effect
Near α titanium alloy
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Summary:The tensile behaviour of near α Ti3Al2.5 V alloy, conceived for applications in aerospace and automotive engineering, is characterized from quasi-static to high strain rates. The material is found to present noticeable strain rate sensitivity. The dynamic true strain rate in the necking cross-section reaches values up to ten times higher than the nominal strain rate. It is also observed that beyond necking the dynamic true stress-strain curves present limited rate dependence. The experimental results at different strain rates are used to determine a suitable constitutive model for finite element simulations of the dynamic tensile tests. The model predicts the experimentally macroscopic force-time response, true stress-strain response and effective strain rate evolution with good agreement.
ISSN:2214-9147
2214-9147
DOI:10.1016/j.dt.2020.07.002