PSI - Issue 58

Lucie Malíková et al. / Procedia Structural Integrity 58 (2024) 68–72 Lucie Malíková et al. / Structural Integrity Procedia 00 (2019) 000–000

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As can be seen from the results presented, the most dangerous place is the bottom point of the corrosion pit. Moreover, it holds for the configurations investigated that the farther is the pit from the centre of the specimen, the larger von Mises stress is observed in the described location. The value of the maximum von Mises stress on this place is much higher for larger (and deeper; the relation between the pit length and its depth was considered as LC = 4 D ) corrosion pits. A smaller sensitivity of the maximum  vonMises value was detected to the mutual distance of the corrosion pits (see the graph above). Experimental campaign on corroded specimens is running to be able to compare the results obtained. Then, the numerical simulations will probably enable to predict the lifetime of corroded specimens quickly and reliably. Note that the results presented are a part of a complex (numerical + experimental) analysis on corroded HSS specimens. 4. Conclusions A parametric numerical study has been performed on a suggested model of a corroded HSS specimen loaded via remote stress range. Corrosion pits act as stress concentrators and affects stress distribution which can be important when lifetime of steel structures is assessed. Thus, stresses  xx ,  yy and  vonMises along selected paths through the specimen were analysed with regard to the corrosion pits size and their mutual distance. Within the parametric study, it was observed that the maximum von Mises stress occurs at the bottom point of the corrosion pits and it is little bit larger for pits farther from the symmetry axis of the specimen. The larger the corrosion pit, the higher the maximum of von Mises stress. The mutual distance of the individual pits affects the results less. When the results of the experimental campaign will be complete, it will be possible to compare the results to each other and obtain more general conclusions. Acknowledgements Financial support from the Czech Science Foundation (project No. 21-14886S) and from the Faculty of Civil Engineering, Brno University of Technology (project No. FAST-S-23-8216) is gratefully acknowledged. References Balbín, J. A., Chaves, V., Larrosa, N. O., 2021. Pit to crack transition and corrosion fatigue lifetime reduction estimations by means of a short crack microstructural model. Corrosion Science 180, paper 190171. Bastidas-Arteaga, E., Bressolette, P., Chateauneuf, A., Sánchez-Silva, M., 2009. Probabilistic lifetime assessment of RC structures under coupled corrosion-fatigue deterioration processes. Structural Safety 31, 84–96. Chen, Ch., Jie, Z., Wang, K., 2021. Fatigue life evaluation of high-strength steel wires with multiple corrosion pits based on the TCD. Journal of Constructional Steel Research 186, paper 106913. Cui, C., Chen, A., Ma, R., 2020. An improved continuum damage mechanics model for evaluating corrosion–fatigue life of high-strength steel wires in the real service environment. International Journal of Fatigue 135, paper 105540. Fatoba, O., Akid, R., 2022. On the behaviour of small fatigue cracks emanating from corrosion pits: Part I – The influence of mechanical factors. Theoretical and Applied Fracture Mechanics 117, paper 103154. Guo, H., Wie. H., Kou, J., Liu, Y., Yang, D., 2021. Mechanical properties test of butt welds of corroded Q690 high strength steel under the coupling of damp-heat cycle dipping. Applied Ocean Research 111, paper 102677. Malíková, L., Benešová, A., Al Khazali M. S., Seitl, S., 2023. Stress concentration factor on a corrosion pit. Transactions of VSB – Technical University of Ostrava, Civil Engineering Series 23 (2), in press. Misiunaite, I., Rimkus, A., Jakubovskis, R., Sokolov, A., Gribniak, V.,2019. Analysis of local deformation effects in cold-formed tubular profiles subjected to bending. Journal of Constructional Steel Research 160, 598–612. Xu, X., Wang, Y., 2015. Estimating the effects of corrosion pits on the fatigue life of steel plate based on the 3D profile. International Journal of Fatigue 72, 27–41. Yan, J.J., Chen, M.T., Quach, W.M., Yan, M., Young, B., 2019. Mechanical properties and cross-sectional behavior of additively manufactured high strength steel tubular sections. Thin-Walled Structures 144, 106–158. Young, B., Li, H.T., 2019. Behaviour of cold-formed high strength steel RHS under localized bearing forces. Engineering Structures 183, 192– 205.