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Enhanced Constitutive Model for Aeronautic Aluminium Alloy (AA2024-T351) under High Strain Rates and Elevated Temperatures

  • Prudvi Reddy Paresi
  • Yanshan Lou
  • Arunachalam Narayanan
  • Jeong Whan YoonEmail author
Article
  • 12 Downloads

Abstract

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 s−1) 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 

Notes

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Copyright information

© KSAE/112-10 2019

Authors and Affiliations

  • Prudvi Reddy Paresi
    • 1
    • 3
  • Yanshan Lou
    • 2
  • Arunachalam Narayanan
    • 3
  • Jeong Whan Yoon
    • 1
    • 4
    Email author
  1. 1.Institute for Frontier MaterialsDeakin UniversityMelbourneAustralia
  2. 2.School of Mechanical EngineeringXi’an Jiaotong UniversityShanxiChina
  3. 3.Department of Mechanical EngineeringIIT MadrasMadras, Tamil NaduIndia
  4. 4.Department of Mechanical EngineeringKAISTDaejeonKorea

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