Abstract
This paper presents the measurement results of the dynamic tensile strength of a High Performance Concrete (HPC) obtained using full-field identification method. An ultra-high speed imaging system and the virtual fields method were used to obtain this information. Furthermore the measurement results were compared with the local point-wise measurement to validate the data pressing. The obtained spall strength was found to be consistently 20% lower than the one obtained when the Novikov formula is used.
Highlights
Owing to its elevated mechanical properties, High Performance Concrete (HPC) presents an affordable alternative to ordinary concrete material
In order to improve its applications in engineering design of protective structures, the dynamic properties of HPC need to be well examined and supported by throughout collection of reliable experimental data on its failure characteristics
An innovative full-field method based on the use of ultra-high-speed photography and the virtual fields method (VFM) is applied to process the data [4]
Summary
Owing to its elevated mechanical properties, High Performance Concrete (HPC) presents an affordable alternative to ordinary concrete material. In order to improve its applications in engineering design of protective structures, the dynamic properties of HPC need to be well examined and supported by throughout collection of reliable experimental data on its failure characteristics This is necessary in dynamic tension, since concrete materials exhibit sensitivity to high strain rates, namely the increase of tensile strength with the increase of the loading rate [2]. The VFM provides the direct relation between measured acceleration field and the average axial stress in the cross-section by exploiting the samples intentional non-equilibrium state throughout the test This allows obtaining local stress-strain response at any cross- section along the sample axis which is visualised with the ultra-high-speed (UHS) camera. The failure tensile stress obtained from several spalling tests using both the identification from full-field measurements and the local measurement of the rearface velocity pull-back based on the Novikov processing [8], are reported and compared
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