PSI - Issue 37

ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 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) 233–240

© 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 Fiber reinforced polymer (FRP) composites find ever growing application possibilities in marine structures. Due to harsh environmental operational conditions, failure prediction of such structures is an imperative in this industry sector. For this reason, samples of epoxy/glass and polyester/glass with various fiber layout configurations have been submerged under the sea for prolonged periods (6 and 12 months). On contrary to usual accelerated laboratory experiments, these type of tests in real sea environment and for prolonged periods are rarely done. They are useful to obtain more realistic environmental input parameters for structural modeling of marine structures. Changes in mass, marine microbiology growth, tensile strength and morphological structures were analyzed after submersion and compared with samples exposed to room environment. All samples exhibited an increase in mass due to seawater absorption and microorganism growth in the organic resins used as matrix materials. The dynamic and level of decrease in tensile strength showed dependency on the fiber layout configuration. Optical and scanning electron microscopical investigation showed significant matrix morphological changes primarily due to salt crystal formation and the impact of sea microorganisms embedding in the resin. Results of this experimental work will be used as realistic input parameters for subsequent failure analysis numerical tool that can be applied for life-time behavior predictions of marine structures. © 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 Failure analysis of FRP composites exposed to real marine environment Goran Vizentin a *, Goran Vukelic a a University of Rijeka Faculty of Maritime Studies, Marine Engineering Department, Studentska 2, HR 51000 Rijeka, Croatia Abstract Fiber reinforced polymer (FRP) composites find ever growing application possibilities in marine structures. Due to harsh envi onmental operational conditions, failur prediction of such structures is an imperat v in this industry sector. For this reason, samples of ep xy/glass and polyester/glass with various fiber layo t configurations have been submerg d unde t e s for prolonged p ri ds (6 and 12 months). On contrary to ual accelerated laboratory experiments, these typ of tests in real sea environment an for prolonged periods are rarely done. They re useful to obt in more realistic environmental input parameters for structural modeling of marine structu s. Changes in mass, marine micr iology growth, ensile strength nd mor hological structures were analyzed after submersion and compared with sampl s exp sed to room enviro m nt. All samples exhibited an increase in mass due to se water a sorpti microorganism growth in the organic resins used as ma rix materia s. The dynamic a d level of decrease in tensile streng h showed dependency on the fiber layout onfiguration. Optical and scanning electron microscopical inv stigation showed si nificant matrix morphological changes primarily due to salt crys al formation a d th impact of sea microorgani ms embedding in the resin. Results of this experimental work will b used as re listic input param ters for subsequent failure analysis numerical tool that can be applied for lif -ti e behavior predictions of marine struct res. © 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 re ponsibility of Pedro Miguel Guimara s Pires Moreira Keywords: composites; sustainability of composites; marine environment; FRP composites 1. Introduction Fiber reinforced polymer (FRP) composites are used in the engineering constructions, whether as an exclusive option fo construction (Cejuela et al., 2020) or as a combination with trad tional materials, suc as steel (Balokhonov ICSI 2021 The 4th International Conference on Structural Integrity Failure analysis of FRP composites exposed to real marine environment Goran Vizentin a *, Goran Vukelic a a University of Rijeka Faculty of Maritime Studies, Marine Engineering Department, Studentska 2, HR 51000 Rijeka, Croatia Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Keywords: composites; sustainability of composites; marine environment; FRP composites 1. Introduction Fiber reinforced polymer (FRP) composites are used in the engineering constructions, whether as an exclusive option for construction (Cejuela et al., 2020) or as a combination with traditional materials, such as steel (Balokhonov

* Corresponding author. Tel.: +385-51-338411; fax: +385-51-336755 E-mail address: goran.vizentin@pfri.uniri.hr * Corresponding author. Tel.: +385-51-338411; fax: +385-51-336755 E-mail address: goran.vizentin@pfri.uniri.hr

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 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 under responsibility of Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.01.079