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Etude expérimentale sur le comportement statique et dynamique à grande vitesse de déformation des microbétons

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Résumé

Cette étude contribue à la compréhension du comportement des microbétons non-armés ou armés de fibres en compression dynamique. Les deux types de microbétons sont testés dans une gamme de vitesse de déformation de 0,0001 à 800 s−1. Ils présentent une sensibilité très importante à la vitesse de déformation, notamment pour le microbéton de fibres d'acier. Les résultats sont obtenus à l'aide du dispositif des barres de Hopkinson (essais dynamiques), et au moyen d'une machine hydraulique MTS pour les essais quasi-statiques.

Summary

This study contributes to the comprehension of the dynamic behaviour of plain (MB) and steel-fibre reinforced (MBF) micro-concrete. These two materials have been deformed under compression loading over a large strain-rate range from 0.0001 to 800 s−1; the dynamic testing is done by the split-Hopkinson pressure bar method and the intermediate rate tests performed on an MTS hydraulic testing machine. Results show that these two microconcretes are strongly sensitive to strain rate: in the high strain-rate range between 100 and 800 s−1, the resistance of these two materials is increased by about 75%. At the same time, the values of deformation are measured from 0.002 to 0.0045 for MB and from 0.005 to 0.0066 for MBF.

From optical microscope observations of the microstructure, it is found that the cracks traverse through the granules and the matrix of cement, and many granules are broken in the case of dynamic loading.

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Authors and Affiliations

  1. Laboratoire des Sciences des Matériaux de la Mécanique, Ecole Nationale Supérieure de Mécanique, 1, rue de la Noë, 44072, Nantes Cedex, France

    C. Y. Chiem

  2. Laboratoire de Génie Civil, Ecole Nationale Supérieure de Mécanique, 1, rue de la Noë, 44072, Nantes Cedex, France

    J. G. Sieffert

Authors
  1. C. Y. Chiem
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  2. J. G. Sieffert
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  3. B. H. Hwaija
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Chiem, C.Y., Sieffert, J.G. & Hwaija, B.H. Etude expérimentale sur le comportement statique et dynamique à grande vitesse de déformation des microbétons. Materials and Structures 23, 426–435 (1990). https://doi.org/10.1007/BF02472025

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