PSI - Issue 28

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 28 (2020) 2174–2180

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Abstract Fine-grained concrete was subjected to tests with and without a pulse shaping techniques. Procedure of dispersion shift of pulses in the measuring bars was used in processing the experimental data. The time histories of forces acting on the sample from the side of measuring bars and the strength characteristics of the material obtained on their basis are compared when using a pulse shaper and correcting the shape of pulses taking into account dispersion as well as with traditional testing and data processing. 2020 The Authors. Published by ELSE IER B.V. i an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: dynamics, split Hopkinson pressure bar, concrete, deformation curve, stress rate 1. Introduction Various types of concrete, which belong to the class of brittle media, during their operation can be subject to dynamic influences and destroy at high strain rates. As the main mechanical characteristics of concrete, take the maximum stress achieved during loading, the magnitude of which is several times greater during compression than in tension. In dynamic tests, concrete shows an increase in strength (Chen et al. (2013), Xu and Wen (2013), Bragov et al. (2013), Thomas and Sorensen (2017), Bragov et al. (2019), Smirnov et al. (2020)), which is characterized by a dynamic increase factor. Dynamic increase factor (DIF) is defined as the ratio of dynamic uniaxial compressive strength to static uniaxial compressive strength. The value of this coefficient has different values according to different Bragov A.M.*, Konstantinov A.Yu., Lamzin D.A., Lomunov A.K., Gonov M.E. Research Institute of Mechanics, Lobachevsky National State Nizhny Novgorod Research University, 23, Gagarin Ave., Nizhny Novgorod, 603950, Russia Abstract Fine-grained concrete was subjected to tests with and without a pulse shaping techniques. Procedure of dispersion shift of pulses in the measuring bars was used in processing the experimental data. The time histories of forces acting on the sample from the side of measuring bars and the strength characteristics of the material obtained on their basis are compared when using a pulse shaper and correcting the shape of pulses taking into account dispersion as well as with traditional testing and data processing. © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: dynamics, split Hopkinson pressure bar, concrete, deformation curve, stress rate 1. Introduction Various types of concrete, which belong to the class of brittle media, during their operation can be subject to dynamic influences and destroy at high strain rates. As the main mechanical characteristics of concrete, take the maximum stress achieved during loading, the magnitude of which is several times greater during compression than in tension. In dynamic tests, concrete shows an increase in strength (Chen et al. (2013), Xu and Wen (2013), Bragov et al. (2013), Thomas and Sorensen (2017), Bragov et al. (2019), Smirnov et al. (2020)), which is characterized by a dynamic increase factor. Dynamic increase factor (DIF) is defined as the ratio of dynamic uniaxial compressive strength to static uniaxial compressive strength. The value of this coefficient has different values according to different 1st Virtual European Conference on Fracture Determination of the mechanical properties of concrete using the split Hopkinson pressure bar method Bragov A.M.*, Konstantinov A.Yu., Lamzin D.A., Lomunov A.K., Gonov M.E. Research Institute of Mechanics, Lobachevsky National State Nizhny Novgorod Research University, 23, Gagarin Ave., Nizhny Novgorod, 603950, Russia 1st Virtual European Conference on Fracture eter ination of the echanical properties of concrete using the split opkinson pressure bar ethod

* Corresponding author. Tel.: +7-831-465-1622; fax: +7-831-465-6025. E-mail address: bragov@mech.unn.ru * Corresponding author. Tel.: +7-831-465-1622; fax: +7-831-465-6025. E-mail address: bragov@mech.unn.ru

2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.11.045