A testing technique for concrete under confinement at high rates of strain

Abstract : A testing device is presented for the experimental study of dynamic compaction of concrete under high strain-rates. The specimen is confined in a metallic ring and loaded by means of a hard steel Hopkinson pressure bar (80 mm diameter, 6 m long) allowing for the testing of specimens large enough regarding the aggregates size. The constitutive law for the metal of the ring being known, transverse gauges glued on its lateral surface allow for the measurement of the confining pressure. The spherical and the deviatoric response of the specimen can then be computed. The proposed method is validated by several numerical simulations of tests involving a set of 4 different concrete-like behaviours and different friction coefficients between the cell and the specimen. Finally, 3 tests performed with the MB50 concrete at 3 different strain rates are processed with the method and are compared with results of the literature obtained with the same material under quasi-static loadings.
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https://hal.archives-ouvertes.fr/hal-00171883
Contributor : Gérard Gary <>
Submitted on : Thursday, September 13, 2007 - 2:15:42 PM
Last modification on : Wednesday, March 27, 2019 - 4:16:23 PM

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Pascal Forquin, Gérard Gary, Fabrice Gatuingt. A testing technique for concrete under confinement at high rates of strain. International Journal of Impact Engineering, Elsevier, 2008, 35 (6), pp.425-446. ⟨10.1016/j.ijimpeng.2007.04.07⟩. ⟨hal-00171883⟩

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