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

Published online by Cambridge University Press:  02 January 2013

Jean-Luc Hanus,
Benoît Magnain,
Bastien Durand,
Javier Alanis-Rodriguez and
Patrice Bailly
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

Abstract

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Evaluation of the dynamic properties of quasi-brittle materials is of the utmostimportance for assessing the vulnerability of structural components under dynamic loadingssuch as collision or explosion. To investigate the dynamic strength of (quasi)-brittlematerial, three-point bending tests are performed on a modified Split Hopkinson PressureBar. Such an apparatus is often used with pre-cracked specimen to determine the dynamicstress intensity factor of metallic materials. With quasi-brittle materials special carehas 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 supportreactions appear as if it was a support-free impact test. A special non-equilibriumanalytical approach has been developed to process the tests. Finite-element simulationsare used to assess relevance of the proposed analysis for normalized short beams.Experimental results on brick and concrete samples showing a significant dynamic strengthincrease are presented.

Keywords

Dynamic bendingout-of-equilibrium statebeam modelfinite-elementSHPBbrittle materialdynamic increase factorFlexion dynamiqueréponse hors équilibremodélisation poutresimulations EFbarres de Hopkinsonmatériau quasi-fragilefacteur d’amplification dynamique

Information

Type
Research Article
Information
Mechanics & Industry , Volume 13 , Issue 6: Giens 2011 , 2012, pp. 381 - 393
Copyright
© AFM, EDP Sciences 2013

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