PSI - Issue 17

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 17 (2019) 363–370

ICSI 2019 The 3rd International Conference on Structural Integrity Registration of local damage based on the use of fiber-optic strain sensors and numerical simulation results Matveenko V.P. a,b , Kosheleva N.A. a* , Serovaev G.S. b , Voronkov A.A. a a Perm National Research Polytechnic University, 29 Komsomolsky prospekt, Perm, Perm krai, 614990 Russia b Institute of Continuous Media Mechanics UB RAS, 1, Akademika Koroleva Str.,Perm, 614013, Russia The paper describes the method of registration and development of local damage (defects) in the material based on experimental data on the strain values recorded by a limited number of fiber-optic strain sensors. The technique is based on the following statements: for external influences, which are different from each other by a constant factor, there is a combination of constants, consisting of all variants of strain ratios, recorded by two sensors; the reason for the conclusion about the defect appearance is a change in some of these constants, due to the fact that the defect appearance leads to a local change in the strains that must be registered by one of the sensors; the numerical simulation results of the stress-strain state are used to select the zones for the strain sensors location. The technique was tested on a structurally similar angle shaped element made of glass fiber reinforced plastic, in which the lower part of the substantially larger shelf is fixed, and tensile forces are applied to the short shelf. For experimental recording of strain, fiber-optic strain sensors based on Bragg gratings glued to the sample surface are used. The results of numerical calculations and experiments are presented, demonstrating that when a certain level of tensile force is reached, a defect, associated with the local destruction of the material in the corner zone, is recorded. ICSI 2019 The 3rd International Conference on Structural Integrity Registration of local damage based on the use of fiber-optic strain sensors and numerical simulation results Matveenko V.P. a,b , Kosheleva N.A. a* , Serovaev G.S. b , Voronkov A.A. a a Perm National Research Polytechnic Univer ity, 29 Komsomolsky prospekt, Perm, krai, 614990 Russia b Institute of Continuous Media Mechanics UB RAS, 1, Akademika Koroleva Str.,Perm, 614013, Russia Abstract The pap r describes the method of registration and development of local damage (defects) in the material based on experimental data on the strain values r corded by a limited number of fiber-optic strain sensors. The technique is based on the following statements: for external influences, which are different from each other by a constant factor, t re is a combination of constants, consisting of all variants f strain ratios, recorded by two sensors; the reason for the conclusion about the defect appearanc is change in some of these constants, due to the fact that the defect appearance leads to a local change in the strains that must be registered by one of the sensors; the numerical simulation results of the stress-strain state are used to select th zones for the strain sensors lo ation. The technique was tested on a structurally similar angle shaped element made of glass fib r reinforced plastic, in which the lower part of the substantially larger shelf is fixed, and tensile forces are appli t t short shelf. For experimental r cording of strain, fiber-optic strain sensors based on Bragg gratings glued to the sample surface ar used. Th results of numerical calculations and experiments are presented, d onstr ting that when a certain level of tensile force is reached, a defect, associated with the local destruction of the material in the corner zone, is recorded. Abstract

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Autho s. Publ shed by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

Keywords: damage detection algorithm; fiber-optic strain sensors; Bragg gratings; numerical simulation; delamination. Keywords: damage detection algorithm; fiber-optic strain sensors; Bragg gratings; numerical simulation; delamination.

* Corresponding author. Tel.: +7(342)-237-83-08. E-mail address: nataly.kosheleva@gmail.com * Correspon ing author. Tel.: +7(342)-237-83-08. E-mail address: nataly.kosheleva@gmail.com

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.048