Processing dynamic split Hopkinson three-point bending test with normalized specimen of quasi-brittle material

Abstract : Evaluation of the dynamic properties of quasi-brittle materials is of the utmost importance for assessing the vulnerability of structural components under dynamic loadings such as collision or explosion. To investigate the dynamic strength of (quasi)-brittle material, three-point bending tests are performed on a modified Split Hopkinson Pressure Bar. Such an apparatus is often used with pre-cracked specimen to determine the dynamic stress intensity factor of metallic materials. With quasi-brittle materials special care has to be paid to the processing of the test since fracture can occur at very low strains. The specimen remains in an out-of equilibrium state and fracture occurs before the support reactions appear as if it was a support-free impact test. A special non-equilibrium analytical approach has been developed to process the tests. Finite-element simulations are used to assess relevance of the proposed analysis for normalized short beams. Experimental results on brick and concrete samples showing a significant dynamic strength increase are presented.
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Submitted on : Friday, March 21, 2014 - 2:28:43 PM
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Jean-Luc Hanus, Benoît Magnain, Bastien Durand, Javier Alanis-Rodriguez, Patrice Bailly. Processing dynamic split Hopkinson three-point bending test with normalized specimen of quasi-brittle material. Mechanics & Industry, EDP Sciences, 2012, 13 (6), pp.381-393. ⟨10.1051/meca/2012026⟩. ⟨ineris-00963411⟩

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