Title: Large scale high strain-rate tests of concrete
Citation: The European Physical Journal vol. 26 p. 01030-p.1-01030-p.6
Publisher: EDP Sciences
Publication Year: 2012
JRC N°: JRC76749
ISSN: 2100-014X
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC76749
DOI: 10.1051/epjconf/20122601030
Type: Articles in periodicals and books
Abstract: This work presents the stages of development of some innovative equipment, based on Hopkinson bar techniques, for performing large scale dynamic tests of concrete specimens. The activity is centered at the recently upgraded HOPLAB facility, which is basically a split Hopkinson bar with a total length of approximately 200m and with bar diameters of 72 mm. Through pre-tensioning and suddenly releasing a steel cable, force pulses of up to 2 MN, 250 μs rise time and 40 ms duration can be generated and applied to the specimen tested. The dynamic compression loading has first been treated and several modifications in the basic configuration have been introduced. Twin incident and transmitter bars have been installed with strong steel plates at their ends where large specimens can be accommodated. A series of calibration and qualification tests has been conducted and the first real tests on concrete cylindrical specimens of 20cm diameter and up to 40cm length have commenced. Preliminary results from the analysis of the recorded signals indicate proper Hopkinson bar testing conditions and reliable functioning of the facility.
JRC Directorate:Space, Security and Migration

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