PSI - Issue 37

ScienceDirect Structural Integrity Procedia 00 (2021) 000 – 000 Structural Integrity Procedia 00 (2021) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceD rect Available online at www.sciencedirect.com ScienceDirect

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

Procedia Structural Integrity 37 (2022) 508–516

© 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 Pedro Miguel Guimaraes Pires Moreira Abstract The paper presents a study devoted to the registration and analysis of experimental results obtained from fiber-optic sensors based on Bragg gratings embedded in samples made of various materials at the technological stage of their manufacture. As the materials into which the fiber-optic sensors were embedded, such polymeric materials as epoxy resin, poured plastic, thermoplastics used in 3D printing, as well as an important structural material - cement were considered. The evolution of the reflected spectra of fiber optic sensors based on Bragg gratings and the measured resonant wavelength shift are shown during the technological processes of fabrication and under loading of finished samples in different directions relative to sensor orientation axis. The paper notes the features associated with the embedment of fiber-optic sensors in various materials, which must be taken into account to ensure the sensor integrity. Recommendations are given for the embedment of fiber-optic sensors into the material to improve the operability of the sensors. © 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) ICSI 2021 The 4th International Conference on Structural Integrity Strain measurements by FBG-based sensors embedded in various materials manufactured by different technological processes Matveenko V.P. a , Kosheleva N.A. a *, Serovaev G.S. a a Institute of Continuous Media Mechanics UB RAS, 1, Akademika Koroleva Str.,Perm, 614068, Russia Abstract The paper presents a study devoted to the registration and analysis of experimental results obtained from fiber-optic sensors based on Br gg gratings embe de in samples made of various material at the t chnological stage of th ir manufacture. As the materials into which the fiber-optic sensors wer e bedded, such polymeric mat rials as epoxy resin, pour d pl stic, the moplastics us d in 3D printing, as w ll as an imp tant structural material - ce ent were consider d. The evolution of the reflected s ectra of fiber optic sensors bas d on Bragg g ati g and the easured r sonant wavele gth shift ar sh wn during the technological processes f fabrication and under loading of finished sa ple in ifferent directions relative to sens r orientation axis. The paper n tes the features ss ci ted with the embedme t of fiber-optic sensors i va ious mat rials, which must b ken into account to e sure s nsor integrity. Recommendations are given for the embedme t of fiber-op ic sensors into the material to improve the operability of the senso s. © 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 u der responsibility of Pedro Miguel Guimara s Pires Morei a K ywords: Fiber-Bragg grating; Strain m asurements; Process-induced strains 1. Introduction The mechanical state monitoring of various structures is one of the most difficult and at the same time demanded issues today. Monitoring the mechanical state du ing th operati n of civil structures, aircrafts, and other ngineering str ctures llows to increase the safety level an ensure ffective cost control, thanks to the early forecasting of s rious breakdowns and disast rs prevention. One of the ways to monitor the sta e of various structures is thr ugh the ICSI 2021 The 4th International Conference on Structural Integrity Strain measurements by FBG-based sensors embedded in various materials manufactured by different technological processes Matveenko V.P. a , Kosheleva N.A. a *, Serovaev G.S. a a Institute of Continuous Media Mechanics UB RAS, 1, Akademika Koroleva Str.,Perm, 614068, Russia Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Keywords: Fiber-Bragg grating; Strain measurements; Process-induced strains 1. Introduction The mechanical state monitoring of various structures is one of the most difficult and at the same time demanded issues today. Monitoring the mechanical state during the operation of civil structures, aircrafts, and other engineering structures allows to increase the safety level and ensure effective cost control, thanks to the early forecasting of serious breakdowns and disasters prevention. One of the ways to monitor the state of various structures is through the

* Corresponding author. Tel.: +7(342)-237-83-08. E-mail address: kosheleva.n@icmm.ru * Corresponding author. Tel.: +7(342)-237-83-08. E-mail address: kosheleva.n@icmm.ru

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 Pedro Miguel Guimaraes Pires Moreira 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 u der responsibility of Pedro Miguel Guimara s Pires Moreira

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 Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.01.116