| ENHANCED CONSTITUTIVE MODEL FOR AERONAUTIC ALUMINIUM
ALLOY (AA2024-T351) UNDER HIGH STRAIN RATES AND ELEVATED
TEMPERATURES |
| Prudvi Reddy Paresi1, 3, Yanshan Lou2, Arunachalam Narayanan3, Jeong Whan Yoon1, 4 |
1Deakin University
2Jiaotong University
3IIT Madras
4KAIST |
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| ABSTRACT |
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Success of the numerical simulations depends on the accuracy of the material constitutive relations. Most of the
ductile materials exhibit increased strain rate sensitivity at higher strain rates (> 103 s1) compared to low and medium strain
rates. Meanwhile, plastic deformation of any ductile material under high strain rate conditions results in heat generation due
to plastic work. Hence, a reliable constitutive model should be able to predict the accurate thermo-mechanical response of the
material over a wide range of strain rate loading conditions. In the present work, an enhanced constitutive model for high strain
rate and elevated temperature is proposed. For calibration purpose, the stress–strain response of AA2024-T351 is studied
under quasi-static and dynamic loading conditions using uniaxial compression and split Hopkinson compressive pressure bar
(SHPB) respectively at various temperatures. A threshold strain rate value is identified and used to improve the prediction
capabilities of the present model. Later, the proposed model is compared with Johnson–Cook (JC) and Khan–Huang–Liang
(KHL) models using the different statistical parameters. This analysis revealed the improved stress–strain prediction capability
of the proposed model compared to the others. |
| Key Words:
AA2024-T351 alloy, Strain rate sensitivity, Constitutive model, Thermo-mechanical response, High speed
compression tests |
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Corresponding Author.
Jeong Whan Yoon , Email. 
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