Constitutive Behavior of a Homogenized AT61 Magnesium Alloy under Different Strain Rates and Temperatures: An Experimental and Numerical Investigation
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 9
Abstract
The performance of a structure is primarily determined by its material characteristics under different loading conditions, strain rates, and temperatures. In the present work, the plastic flow response of a homogenized AT61 magnesium alloy was constitutively analyzed under a wide variety of quasi-static and dynamic strain rates. The quasi-compression test was conducted at 25°C–250°C with strain rates from to . The dynamic loading of AT61 alloy was performed on a split Hopkinson pressure bar (SHPB) apparatus under a strain rate of . The material shows hardening behavior throughout the strain rate regime, whereas the plastic flow stress significantly reduces with an increase in deformation temperature. At a very high strain rate, the accumulated energy around the cracks is attributed to the dynamic recrystallisation with the onset of adiabatic temperature rises in the materials. A phenomenological Johnson-Cook (JC) model was also calibrated and used for numerical simulation in ABAQUS/Explicit to predict the material flow response. It was observed that a strong correlation exists between experimental and numerical results.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 9 • September 2023
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© 2023 American Society of Civil Engineers.
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Received: Oct 16, 2022
Accepted: Feb 28, 2023
Published online: Jun 28, 2023
Published in print: Sep 1, 2023
Discussion open until: Nov 28, 2023
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- Gaurav Singh, Purnashis Chakraborty, Vikrant Tiwari, A comparative study of different constitutive models to predict the dynamic flow behaviour of a homogenised AT61 magnesium alloy, Structures, 10.1016/j.istruc.2023.05.074, 54, (631-643), (2023).