Experimental Mechanics

, Volume 51, Issue 4, pp 509–536 | Cite as

Full-Field Strain Measurement and Identification of Composites Moduli at High Strain Rate with the Virtual Fields Method

  • R. Moulart
  • F. Pierron
  • S. R. Hallett
  • M. R. Wisnom
Article

Abstract

The present paper deals with full-field strain measurement on glass/epoxy composite tensile specimens submitted to high strain rate loading through a split Hopkinson pressure bar (SHPB) device and with the identification of their mechanical properties. First, the adopted methodology is presented: the device, including an Ultra-High Speed camera, and the experimental procedure to obtain relevant displacement maps are described. The different full-field results including displacement, strain and acceleration maps for two mechanical tests are then addressed. The last part of the paper deals with an original procedure to identify stiffnesses on this dynamic case only using the actual strain and acceleration maps (without the applied force) by using the Virtual Fields Method. The results provide very promising values of Young’s modulus and Poisson’s ratio on a quasi-isotropic glass-epoxy laminate. The load reconstructed from the moduli and strains compares favourably with that from the readings.

Keywords

Full-field measurement High strain rate UHS camera Grid method SHPB Virtual Fields Method Fibre composites 

Notes

Acknowledgements

The authors would like to express their gratitude to the UK Engineering and Physical Sciences Research Council for their financial support to this project (Grant n°: EP/G001715/1) and the loan of the Ultra High Speed camera through the Engineering Instrument Pool.

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Copyright information

© Society for Experimental Mechanics 2010

Authors and Affiliations

  • R. Moulart
    • 1
  • F. Pierron
    • 1
  • S. R. Hallett
    • 2
  • M. R. Wisnom
    • 2
  1. 1.LMPF, Arts et Métiers ParisTechChâlons-en-ChampagneFrance
  2. 2.Department of Aerospace EngineeringUniversity of BristolBristolUK

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