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On the Constitutive Models for Ultra-High Strain Rate Deformation of Metals

  • Hossein Sedaghat
  • Weixing Xu
  • Liangchi ZhangEmail author
  • Weidong Liu
Article
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Abstract

Ultra-high strain rate deformation (> 104 s−1) is common in high speed manufacturing and impact engineering. However, a general constitutive model suitable for describing the material deformation at ultra-high strain rates is still unavailable. The purpose of this study is of two-folds. The first is to systematically evaluate the performances of four typical constitutive models, Johnson-Cook (J-C), Khan-Huang-Liang (KHL), Zerilli-Armstrong (Z-A), and Gao-Zhang (G-Z), in predicting the dynamic behaviors of materials. The second is to obtain an improved constitutive model to better describe the deformation of materials under ultra-high strain rates. To this end, high strain rate tests were carried out on different crystalline structures, i.e., BCC, FCC, and HCP over a wide range of strain rate from 102 s−1 to 1.5 × 104 s−1. It was found that before the critical strain rate, around 104 s−1, all of the previous models can predict the flow stresses. When the strain rate passes a critical point, however, these models fail to predict the sudden upsurge of the flow stresses. The improved model developed in this paper, by considering the dislocation drag mechanism, can successfully characterize the dynamic behaviours of materials over the whole range of strain rates.

Key words

Ultra high strain-rate Constitutive model Dislocations Drag mechanism 

Notes

Acknowledgement

This research was financially supported by an ARC Discovery Project (DP170100567) and was undertaken with the assistance of resources provided at the NCI National Facility systems at the Australian National University and Intersect Australia Ltd.

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Copyright information

© KSAE/112-05 2019

Authors and Affiliations

  • Hossein Sedaghat
    • 1
  • Weixing Xu
    • 1
  • Liangchi Zhang
    • 1
    Email author
  • Weidong Liu
    • 1
  1. 1.Laboratory for Precision and Nano Processing Technologies, School of Mechanical and Manufacturing EngineeringThe University of New South WalesSydneyAustralia

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