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Ultra High Speed DIC and Virtual Fields Method Analysis of a Three Point Bending Impact Test on an Aluminium Bar

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Abstract

This paper deals with the analysis of an aluminium beam impacted in a three point bending configuration using a Hopkinson bar device. Full-field deformation measurements were performed using Digital Image Correlation on images captured with an ultra high speed camera (16 frames at a time resolution of 10 μs). The performance of the deformation and strain measurements were evaluated and the data were then used quantitatively to analyse the very complex dynamic behaviour of the beam. It was shown that the deformation of the beam was controlled by the interaction between the striker and the flexural bending wave triggered by the initial impact. The principle of virtual work was used to reconstruct the impact force from the shear strains and to analyze how this impact force relates to the acceleration of the specimen (inertia forces) and the development of the bending stresses. The results are in good agreement with expectations. This opens up new perspectives in the quantitative use of full-field measurements to extract elasto-plastic constitutive parameters from such impact tests.

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Authors and Affiliations

  1. Laboratoire de Mécanique et Procédés de Fabrication, Arts et Metiers ParisTech, Rue St Dominique, B.P.508, 51006, Châlons en Champagne, France

    F. Pierron (SEM member)

  2. Department of Mechanical Engineering, University of South Carolina, Columbia, SC, USA

    M. A. Sutton (SEM fellow) & V. Tiwari

Authors
  1. F. Pierron
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  2. M. A. Sutton
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  3. V. Tiwari
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Correspondence to F. Pierron.

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Pierron, F., Sutton, M.A. & Tiwari, V. Ultra High Speed DIC and Virtual Fields Method Analysis of a Three Point Bending Impact Test on an Aluminium Bar. Exp Mech 51, 537–563 (2011). https://doi.org/10.1007/s11340-010-9402-y

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  • DOI: https://doi.org/10.1007/s11340-010-9402-y

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