PSI - Issue 41

Hryhoriy Nykyforchyn et al. / Procedia Structural Integrity 41 (2022) 326–332 Hryhoriy Nykyforchyn, Vitaliy Pustovyi, Olha Zvirko et al. / Structural Integrity Procedia 00 (2022) 000 – 000

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Fig. 2 depicts a compilation of the testing results obtained for the operated portal crane Sokol. Impact toughness KCV is used as an indicator of its operational degradation, and polarization resistance R p is a measure of its corrosivity. This electrochemical parameter is the most sensitive to changes in the corrosion resistance of the metal caused by its operation, as it was demonstrated by Pustovoi et al. (2015), Nemchuk and Zvirko (2020), Zvirko (2022). Despite the significant scatter of the experimental data, a trend to the corrosion resistance loss with the drop of the resistance to brittle fracture is quite evident. A high corrosion rate of metal in the marine environment with hydrogenating capability implies the intensification of degradation processes, especially in rolled steels susceptible to hydrogen embrittlement. Based on this, these authors suggested using such a relationship for elaborating a non destructive method for the assessment of the current brittle fracture resistance of the operating port handling equipment. 5. Concluding remarks Convenient approaches are unsuitable for substantiating the safe excessive operation of steel structures of seaport hoisting and transporting equipment since they do not take into account the degradation of the mechanical properties of metal, first of all, characteristics of brittle fracture resistance, in a course of its operation. Two crucial factors in the operational loss of serviceability of handling metal structures, namely, operational stresses and ambient environment, are considered. Firstly, intensive operational cyclic loading significantly varies for different structure units, thus, leading to different levels of their operational degradation. 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