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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
The cross-section in the mid-span region of the PU-based CFRP samples under 58% strain level for 6 months: (a) broken samples in seawater at 60 °C, (b) unbroken samples in seawater at 60 °C.