PSI - Issue 36

ScienceDirect Available online at www.sciencedirect.com Sc enceDir t StructuralIntegrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com ScienceDirect StructuralIntegrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 36 (2022) 114–121

© 2022 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 conference Guest Editors Abstract The effect of fiber volume fraction on the flexural and acoustic emission behaviors of steel fiber reinforced concrete (SFRC) using three-point bending test was investigated. Hooked-end steel fibers with a profiled surface and three volume fractions of 1.5%, 2% and 2.5% were selected. The flexural behavior of SFRC in terms of load-deflection curve and ultimate flexural load was studied. The parameters of the continuous wavelet transform and energy distribution of the discrete wavelet transform of acoustic emission signals were used to describe the fracture process and identification of fracture type of SFRC. © 2022 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 conference Guest Editors Keywords: Fracture; fiber reinforced concrete; steel fiber; acoustic emission; wavelet transform 1. Introduction The development of damage and fracture of fiber-reinforced cement composites is accompanied by complex physical phenomena due to interrelated factors of different structural levels. The properties of such composites depend on the type of matrix (cement, concrete, main and additional components), fiber (type, volume fraction, length, diameter, strength, stiffness, etc.) and the phase transition. Studies of the effect of fiber on the mechanical behavior of steel fiber reinforced concrete (SFRC) under the action of external loads are widely presented in the literature (Khan et al. (2016)). However, for designing engineering structures, it is important to take into account not only the behavior of fiber in a particular matrix under load, but also to understand the dynamics of fracture in such Abstract The effect of fiber volume fraction on the flexural and acoustic emission behaviors of steel fiber reinforced concrete (SFRC) using three-point bending test was investigated. Hooked-end steel fibers with a profiled surface and three volume fractions of 1.5%, 2% and 2.5% were selected. The flexural behavior of SFRC in terms of load-deflection curve and ultimate flexural load was studied. The parameters of the continuous wavelet transform and energy distribution of the discrete wavelet transform of acoustic emission signals were used to describe the fracture process and identification of fracture type of SFRC. © 2022 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 conference Guest Editors Keywords: Fracture; fiber reinforced concrete; steel fiber; acoustic emission; wavelet transform 1. Introduction The development of damage and fracture of fiber-reinforced cement composites is accompanied by complex physical ph no a due to interrelated factors of diff rent structural levels. The properties of such composit s depend on the type of matrix (cement, concrete, ma n and addition l components), fib (type, volume fraction, length, diameter, strength, stiffness, etc.) a d th ph se transition. Studies of th effect of fiber on the mechanical behavior of st el fiber reinforced con rete (SFRC) unde the action of xternal loads are widely present d i the liter ture (Khan et al. (2016)). However, for designing engine ring structures, it is important to take into account not only he behavior of fiber in a particular matrix u der load, but also to understand the dy amics of fracture in such 1st Virtual International Conference “In service Damage of Materials: Diagnostics and Prediction” Identification of fracture mechanisms in cementitious composites using wavelet transform of acoustic emission signals Olena Stankevych a,b *, Valentyn Skalskyi a , Bogdan Klym a , Petro Velykyi a a Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, 5, Naukova St., Lviv 79060, Ukraine b Lviv Politechnic National University, 12, S. Badnery St., Lviv 79000, Ukraine 1st Virtual International Conference “In service Damage of Materials: Diagnostics and Prediction” Identification of fracture mechanisms in cementitious composites using wavelet transform of acoustic emission signals Olena Stankevych a,b *, Valentyn Skalskyi a , Bogdan Klym a , Petro Velykyi a a Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, 5, Naukova St., Lviv 79060, Ukraine b Lviv Politechnic National University, 12, S. Badnery St., Lviv 79000, Ukraine

* Corresponding author. Tel.: +380-32-339-68-75; fax: +380-32-264-94-27. E-mail address: o.m.stankevych@gmail.com * Corresponding author. Tel.: +380-32-339-68-75; fax: +380-32-264-94-27. E-mail address: o.m.stankevych@gmail.com

2452-3216 © 2022 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 conference Guest Editors 2452-3216 © 2022 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 conference Guest Editors

2452-3216 © 2022 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 conference Guest Editors 10.1016/j.prostr.2022.01.011