PSI - Issue 82

Valentyn Uchanin et al. / Procedia Structural Integrity 82 (2026) 288–294 Valentyn Uchanin et al. / Structural Integrity Procedia 00 (2026) 000–000

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Lindgren and Lepistö (2002), Minakov and Uchanin (2020), Xie et al. (2024), and Zellner and Svensson (1983). Our approach employs the contactless MA method for stress determination (Minakov and Uchanin, 2020).

Fig. 6. (a) Operator with MA analyzer, and (b) typical procedure of framework launching during bridge construction: 1 – framework; 2 – expansion pedestal; 3 – abutments; 4 – launching nose (cutwater); 5 – receiving abutments.

The proposed method was applied during the launching of the bridge framework across the Dnieper River (Kyiv, Ukraine). The evaluated framework was produced from 15CHSND type FSS. MA probes were mounted on the different framework walls in the expansion pedestal area, with the possibility of the displacement along the framework wall (Fig. 6a). The measured stresses in the walls of the bridge construction depend on the weight of the cantilever part of the bridge framework, which is changed during the launching and can be calculated. So, our trials show the clear correlation of stresses measured by the MA method with the calculated weight of the cantilever part during the launching. 3. Conclusions Two electromagnetic NDT methods based on the parameters of the structure-sensitive MHL evaluation measured by an attachable type magnetic transducer and based on changes in the MA of FSS under the influence of mechanical stresses are analyzed. Promising results are concerned with the search for informative parameters sensitive to the hydrogen concentration in FSS. It was shown that the MHL parameters, namely the CF and remanence, are most sensitive to changes in the hydrogen concentration. It was shown that the eddy current method based on MA probes can be used for non-contact determination of mechanical stresses in the surface layers of FSS components. Two applications of the MA method related to the determination of the distribution of operational stresses in FSS pipelines and related to the balance between side walls during the bridge framework launching are considered. References Abuku, S., 1977. Magnetics studies of residual stress in iron and steel induced by uniaxial deformation. Japan Journal of Applied Physics 16, 1161–1170. Barrera, O., Bombac, D., Chen, Y., Daff, T.D., Galindo-Nava, E., Gong, P., Haley, D., Horton, R., Katzarov, I., Kermode, J.R., Liverani, C., Stopher, M., Sweeney, F., 2018. Understanding and mitigating hydrogen embrittlement of steels: a review of experimental, modelling and design progress from atomistic to continuum. Journal of Materials Science 53, 6251–6290. Becker, R., Dobmann, G., Kröning, M., Reiter, H., Schneider, E., 1997. Integration of NDT into lifetime management. International Journal of Pressure Vessels and Piping 73, 11–17. Bellahcene, T., Capelle, J., Aberkane, M., Azari, Z., 2012. Effect of hydrogen on mechanical properties of pipeline API 5L X70 steel. Applied Mechanics and Materials 146, 213–225. Dmytrakh, I., Syrotyuk, A., Leshchak, R., 2022. Role of electrochemically diffusible hydrogen in the initial damage of low-alloyed pipeline steel. Current Topics in Electrochemistry 24, 27–35. Dmytrakh, I.M., Syrotyuk, A.M., Leshchak, R.L., 2018. Specific features of the deformation and fracture of low-alloy steels in hydrogen-containing media: influence of hydrogen concentration in the metal. Materials Science 54, 295–308. Dmytrakh, I.M., Syrotyuk, A.M., Leshchak, R.L., 2024. Special diagram for hydrogen effect evaluation on mechanical characterizations of pipeline steel. Journal of Materials Engineering and Performance 33, 3441–3454.