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A computational approach to design new tests for viscoplasticity characterization at high strain-rates

  • Pascal Bouda
  • Bertrand LangrandEmail author
  • Delphine Notta-Cuvier
  • Eric Markiewicz
  • Fabrice Pierron
Original Paper
  • 56 Downloads

Abstract

Rate-dependent behaviour characterization of metals at high strain rate remains challenging mainly because of the strong hypotheses when tests are processed with statically determinate approaches. As a non-standard methodology, Image-Based Inertial Impact (IBII) test has been proposed to take advantage of the dynamic Virtual Fields Method (VFM) which enables the identification of constitutive parameters with strain and acceleration fields. However, most of the test parameters (e.g. projectile velocity, specimen geometry) are not constrained. Therefore, an FE-based approach is addressed to optimize the identification over a wide range of strain and strain-rate, according to two design criteria: (1) the characterized viscoplastic spectra, (2) the identifiability of the parameters. Whereas the first criterion is assessed by processing the FEA simulations, the second is rated extracting material parameters using synthetic images to input the VFM. Finally, uncertainties regarding the identification of material constants are quantified for each IBII test configuration and different camera performances.

Keywords

Virtual field method Impact Optimization Viscoplasticity Testing 

Notes

Acknowledgements

The authors are grateful to Onera and the Région Hauts-de-France for cofunding this project. Prof. Pierron acknowledges support by EPSRC through Grant EP/L026910/1.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.DMAS, ONERALilleFrance
  2. 2.LAMIH UMR CNRS 8201UPHF Le Mont HouyValenciennes Cedex 9France
  3. 3.Faculty of Engineering and the EnvironmentUniversity of SouthamptonHighfieldUK

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