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.
Highlights
The quasi-static tensile strength of a geomaterial can be evaluated in several ways: direct tensile tests or Article published by EDP Sciences
The tensile strength is often estimated from two indirect standardized tensile tests: the flexural tensile strength test and the Brazilian or splitting tensile strength test
The aim of this paper is to provide a comparative analysis of a test processing using the proposed analytical approach and numerical simulations by the finite-element method and to present experimental results on concretelike materials
Summary
The quasi-static tensile strength of a geomaterial can be evaluated in several ways: direct tensile tests or Article published by EDP Sciences. The main advantages of the direct tensile test are a known and simple stress state and a stressing of the entire gage-section volume so that it appears to be the natural way to determine the strength or to obtain a complete stress-strain curve. This test, not standardized, is complexed to perform to guarantish a purely uniaxial tensile stress state in the gagesection without any perturbation from additional torsion or bending stress state. Results of dynamic tensile strength enhancement with brick and concrete specimen are presented
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