PSI - Issue 16

Valentyn Uchanin et al. / Procedia Structural Integrity 16 (2019) 192–197 Valentyn Uchanin, Orest Ostash / Structural Integrity Procedia 00 (2019) 000 – 000

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the tensile stress influence in relation to the structural state of ferromagnetic steel was shown. Two applications were realized concerned with the residual stresses in pipeline welding area and applied stresses in the bridge framework walls during the process of the launching to the pillars (Uchanin et al. (2018)).

Fig. 6. Changes in EC probe signal amplitude during (left) tensile and (right) compressive loading (●) and subsequent unloading (○) .

7. Conclusions

NDT methods can create the background for mechanical parameters estimation for long term exploited materials and for materials after the welding procedures influence. Principal attention taken into consideration in this study is the investigation of the correlations between material properties measured nondestructively (e.g., SEC for nonmagnetic alloys or CF for ferrous steel) and characteristics of FCGR needed for residual life estimation. It was shown, that the AA degradation monitoring can be executed nondestructively by EC measurements of SEC with FCGR characteristic estimation through the dielectric coating and pure aluminum plating in in-service conditions. The mechanical properties in AA welded joints can be evaluated nondestructively by EC method by noncontact SEC measurement. Mechanical properties of SP steels after long-term operation can be monitored by the CF measurements. Mechanical stresses along the ship structural components under operational loading can be evaluated by determination of the CF distribution. Due to proposed concept the monitoring must be carried out by placing the CF sensors in the preliminary defined critical areas. EC method based on MA changes for noncontact determination of stresses in ferromagnetic steel components was proposed. The existence of the magneto-mechanical hysteresis and the invariant property of MA EC probe signal in relation to the structural state of ferromagnetic steel were shown. Two practical applications of the MA method for stress determination were realized. References Labur, T., Ostash, О., Holovatyuk, Ju., Uchanin, V., Yavors ’ ka, M., Pashulya М. , Koval ’ , V., Shinkarenko, V., 2016. Influence of the space orientation of joints in the process of welding on the strength and cyclic crack resistance of welded joints. Materials Science 52 (2), 180 – 187. Ostash, O., Andreiko, I., Holovatyuk, Yu., 2006. Degradation of materials and fatigue durability of aircraft constructions after long-term operation. Materials Science 42 (4), 427 – 439. Ostash, O., Fedirko, V., Uchanin, V. Bychkov, S., Moliar, O., Semenets, O., Kravets, V., Derecha, V., 2007. Strength and durability of airplane materials and structural elements (in Ukrainian). Spolom, Lviv, pp. 1068. Ostash, O., Uchanin, V., Andreiko, I., Holovatyuk, Yu., 2014a. Eddy current method for determination of the local degradation level of structural materials during long-term exploitation, Ukrainian patent № 106168 (in Ukrainian). Ostash,O., Vol’demarov , O., Hladysh, P., 2014b. Diagnostics of the structural-mechanical state of steels of steam pipelines by the coercimetric method and prediction of their service life. Materials Science 49 (5), 667 – 680. Ostash, O., Uchanin, V., Semenets, O., Holovatyuk, Yu., Kovalchuk, L., Derecha, V., 2018. Evaluation of aluminium alloys degradation in aging aircraft. Reseach in Nondestructive Evaluation 29 (3), 156 – 166. Uchanin, V. (Ed), 2011. Steam Generators Systems: Operational Reliability and Efficiency. InTech, Rijeka, pp. 424 (www.intechopen.com). Uchanin, V., 2012. Method for measurement of nonmagnetic materials conductivity. Ukrainian patent № 98206 (in Ukrainian). Uchanin, V., Makarov, G., Cherlenevskij, V., 2012. Eddy current meter for measurement of nonmagnetic materials conductivity. Ukrainian patent № 97304 (in Ukrainian). Uchanin, V., Minakov, S., Nardoni, G., Ostash, O., Fomichov S., 2018. Nondestructive Determination of Stresses in Steel Components by Eddy Current Method. Journal of Mechanical Engineering 64 (11), 690 – 697. Zavalniuk O., Uchanin V., 2013. The monitoring of stress-strain state of bearing elements of ship structures (in Ukrainian). Information extraction and processing 38 (114), 13 – 16.