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

Published online by Cambridge University Press:  02 January 2013

Jean-Luc Hanus*
Affiliation:
PRISME Laboratory, Loire Valley University, ENSI de Bourges, 88 boulevard Lahitolle, 18020 Bourges Cedex, France
Benoît Magnain
Affiliation:
PRISME Laboratory, Loire Valley University, ENSI de Bourges, 88 boulevard Lahitolle, 18020 Bourges Cedex, France
Bastien Durand
Affiliation:
PRISME Laboratory, Loire Valley University, ENSI Bourges, INERIS Parc Technologique Alata, 60550 Verneuil en Halatte, France
Javier Alanis-Rodriguez
Affiliation:
PRISME Laboratory, Loire Valley University, ENSI Bourges, INERIS Parc Technologique Alata, 60550 Verneuil en Halatte, France
Patrice Bailly
Affiliation:
PRISME Laboratory, Loire Valley University, ENSI de Bourges, 88 boulevard Lahitolle, 18020 Bourges Cedex, France
*
a Corresponding author: jean-luc.hanus@ensi-bourges.fr
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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.

Type
Research Article
Copyright
© AFM, EDP Sciences 2013

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