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

Long-hui Zhang; Antonio Pellegrino; Nik Petrinic

doi:10.1016/j.dt.2020.07.002

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

Long-hui Zhang, Antonio Pellegrino, Nik Petrinic

University of Oxford

Research output: Contribution to journal › Article › peer-review

8 Citations (SciVal)

Abstract

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.

Original language	English
Pages (from-to)	1126-1134
Number of pages	9
Journal	Defence Technology
Volume	17
Issue number	4
Early online date	9 Jul 2020
DOIs	https://doi.org/10.1016/j.dt.2020.07.002
Publication status	Published - 31 Aug 2021

Keywords

Constitutive modeling
Finite element simulation
High strain rate
Locking effect
Near α titanium alloy

ASJC Scopus subject areas

Computational Mechanics
Ceramics and Composites
Mechanical Engineering
Metals and Alloys

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10.1016/j.dt.2020.07.002Licence: CC BY-NC-ND

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

abstract = "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.",

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AB - 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.

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KW - Locking effect

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

Abstract

Keywords

ASJC Scopus subject areas

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