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Experimental method for concrete testing at high strain rate tensile loading
The understanding of concrete responses to short-lived stresses and high amplitude impulse loads are of vital importance in design and analysis of protective strctures. However, under such loading the strength data of most brittle materials, amongst other concrete, are very limited. For instance, the data concerning the dynamic tensile behavior of concrete beyond the strain rate of about 20 s-1 are practically non existent. The shortage of the information on this subject might be attributed primarily to an insufficiently developed base for dynamic tests applicable for brittle materials. An original experimental method for investigating the dynamic tensile strength of brittle materials such a concrete is developed in the Laboratory of Physics and Mechanics of Materials of Metz. The experimental method suggested by Klepaczko is based on a judicious combination of the Hopkinson bar principle and the spalling technique. This method allowed for reaching very high loading rates of about 5000 GPa/s (corresponding to strain rate up to 120 s-1). An experimental program on concrete was performed with this new equipment. The mean trends of the dynamic tensile behavior found in the literature for high loading rates are confirmed by the experimental results obtained, specially the continuation of the drastically strong increase of the tensile strength beyond the strain rate threshold of 1 s-l. Those additional results permit for better estimation of the concrete strength in tension and are used by many authors to model the concrete behavior within the following range of strain rates: 20 s-1 to 120 s-l.
Experimental method for concrete testing at high strain rate tensile loading
The understanding of concrete responses to short-lived stresses and high amplitude impulse loads are of vital importance in design and analysis of protective strctures. However, under such loading the strength data of most brittle materials, amongst other concrete, are very limited. For instance, the data concerning the dynamic tensile behavior of concrete beyond the strain rate of about 20 s-1 are practically non existent. The shortage of the information on this subject might be attributed primarily to an insufficiently developed base for dynamic tests applicable for brittle materials. An original experimental method for investigating the dynamic tensile strength of brittle materials such a concrete is developed in the Laboratory of Physics and Mechanics of Materials of Metz. The experimental method suggested by Klepaczko is based on a judicious combination of the Hopkinson bar principle and the spalling technique. This method allowed for reaching very high loading rates of about 5000 GPa/s (corresponding to strain rate up to 120 s-1). An experimental program on concrete was performed with this new equipment. The mean trends of the dynamic tensile behavior found in the literature for high loading rates are confirmed by the experimental results obtained, specially the continuation of the drastically strong increase of the tensile strength beyond the strain rate threshold of 1 s-l. Those additional results permit for better estimation of the concrete strength in tension and are used by many authors to model the concrete behavior within the following range of strain rates: 20 s-1 to 120 s-l.
Experimental method for concrete testing at high strain rate tensile loading
Experimentelle Methode zum Beton-Testen bei Zugversuchen unter hoher Dehngeschwindigkeit
Klepaczko, J.R. (author) / Brara, A. (author)
2004
6 Seiten, 5 Bilder, 1 Tabelle, 14 Quellen
Conference paper
English
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