Further investigation on the dynamic compressive strength enhancement of concrete-like materials based on split Hopkinson pressure bar tests. Part I: Experiments
Top Cited Papers
- 23 May 2009
- journal article
- Published by Elsevier BV in International Journal of Impact Engineering
- Vol. 36 (12), 1327-1334
- https://doi.org/10.1016/j.ijimpeng.2009.04.009
Abstract
Effects of the inertia-induced radial confinement on the dynamic increase factor (DIF) of a mortar specimen are investigated in split Hopkinson pressure bar (SHPB) tests. It is shown that axial strain acceleration is unavoidable in SHPB tests on brittle samples at high strain-rates although it can be reduced by the application of a wave shaper. By introducing proper measures of the strain-rate and axial strain acceleration, their correlations are established. In order to demonstrate the influence of inertia-induced confinement on the dynamic compressive strength of concrete-like materials, tubular mortar specimens are used to reduce the inertia-induced radial confinement in SHPB tests. It is shown that the DIF measured by SHPB tests on tubular specimens is lower than the DIF measured by SHPB tests on solid specimens. This paper offers experimental support for a previous publication [Li QM, Meng H. About the dynamic strength enhancement of concrete-like materials in a split Hopkinson pressure bar test. Int J Solids Struct 2003; 40:343–360.], which claimed that inertia-induced radial confinement makes a large contribution to the dynamic compressive strength enhancement of concrete-like materials when the strain-rate is greater than a critical transition strain-rate between 101 and 102 s−1. It is concluded that DIF formulae for concrete-like materials measured by split Hopkinson pressure bar tests need to be corrected if they are going to be used as the unconfined uniaxial compressive strength in the design and numerical modelling of structures made from concrete-like materials to resist impact and blast loads.Keywords
This publication has 23 references indexed in Scilit:
- The effect of radial inertia on brittle samples during the split Hopkinson pressure bar testInternational Journal of Impact Engineering, 2006
- Impact behaviour of concrete: a computational approachEngineering Fracture Mechanics, 2004
- Correlation between the accuracy of a SHPB test and the stress uniformity based on numerical experimentsInternational Journal of Impact Engineering, 2003
- Influence of lateral confinement on dynamic damage evolution during uniaxial compressive response of brittle solidsJournal of the Mechanics and Physics of Solids, 2003
- Dynamic behavior of concrete at high strain rates and pressures: I. experimental characterizationInternational Journal of Impact Engineering, 2001
- Strain-Rate-Dependent Constitutive Equations for ConcreteJournal of Pressure Vessel Technology, 1998
- An improved method for compressive stress-strain measurements at very high strain ratesProceedings of the Royal Society of London. Series A: Mathematical and Physical Sciences, 1992
- Specimen inertia in high strain-rate compressionJournal of Physics D: Applied Physics, 1989
- The dynamic compression testing of solids by the method of the split Hopkinson pressure barJournal of the Mechanics and Physics of Solids, 1963
- An Investigation of the Mechanical Properties of Materials at very High Rates of LoadingProceedings of the Physical Society. Section B, 1949