Technical Diagnostics and Non-Destructive Testing, 2020, №02



2020 №02 (01)

DOI of Article 10.37434/tdnk2020.02.02

2020 №02 (03)

---

Technical Diagnostics and Non-Destructive Testing #2, 2020, pp. 13-21

Diagnosis of damage to ferromagnetic steels during mechanical loading by results of measurements of coercive force

O.P. Gopkalo¹, G.Ya. Bezlyudko², A.A. Kotliarenko¹, Yu.P. Kurash¹, R.M. Solomacha²

¹G.S. Pisarenko Institute for Problems of Strength of the NASU, Kyiv, Ukraine. 01014, 2 Timiryazevska str., E-mail: ips@ipp.kiev.ua
²LLC «Special Scientific Developments», Kharkiv, Ukraine. 61184, Kharkiv, s/b 12036. E-mail: mail@snr-ndt.com

An experimental substantiation of the possibility of estimating the degree of technological and operational damage to metal structures made of ferromagnetic steels was performed by the results of measuring the coercive force. The revealed effect of a sharp change of direction and maximum values of coercive force when exceeding the stresses of the conditional yield strength on the surface of the most damaged parts of the product allows separating the damage received in the structure metal under elastic deformation (to the tensile yield strength) and damage obtained at elasto-plastic deformation right up to destruction, and clearly delineating the boundaries of the zones of received reversible and irreversible damage. Due to the effect of a sharp change in the direction and maximum values of coercive force at exceeding the stresses of the conditional yield strength in the most damaged parts of structures, there is no need to determine the mechanical characteristics of strength and ductility of the metal, as the load diagnostics is conducted relative to the conditional yield strength. Variation of the orientation of the pole tips of the sensor magnets to measure the values of coercive force relative to the studied surface allows determination of the most deformed and damaged areas, establishing the direction of principal stresses and assessing the structural homogeneity of the metal. 14 Ref., 10 Fig.
Keywords: structuroscope, coercive force, load, damage, stress, deformation, fracture

Received: 24.01.2020

References

1. Lepesh, G.V. (2015) Sovremennye metody i sredstva diagnostiki oborudovaniya inzhenernykh sistem zdanij i sooruzhenij. Tekhniko-tekhnologicheskie problemy` servisa, 4(34), 3–8 [in Russian].
2. Lepesh, G.V. (2015) Diagnostika i kompleksnoe obsluzhivanie inzhenerno-tekhnicheskikh sistem i oborudovaniya zdanij i sooruzhenij. Tekhniko-tekhnologicheskie problemy servisa, 5(35), 6–16 [in Russian].
3. GOST 18353-79 Kontrol` nerazrushayushhij. Klassifikacziya vidov i metodov. Gruppa T59. Non-destructive check. Classification of types and methods. Data vvedeniya 1980- 07-01. Postanovleniem Gosudarstvennogo komiteta SSSR po standartam ot 11 noyabrya 1979 g. № 4245 data vvedeniya ustanovlena 01.07.80. Vzamen GOST 18353-73. E`lektronnyj fond normativno-pravovoj dokumentaczii. Rezhim dostupa: http://docs.cntd.ru/document/gost-18353-79 (data obrashheniya 5.05.2016) [in Russian].
4. GOST 20911-89 Tekhnicheskaya diagnostika. Terminy i opredeleniya Technical diagnostics. Terms and definitions. Data vvedeniya 1991-01-01.Utverzhden i vveden v dejstvie Postanovleniem Gosudarstvennogo komiteta SSSR po upravleniyu kachestvom produkczii i standartam ot 26.12.89 № 4143. Vzamen GOST 20911-75. Pereizdanie. Noyabr` 2009g. Rezhim dostupa http://docs.cntd.ru/document/1200009481 (data obrashheniya 5.05.2016) [in Russian].
5. Khrystenko, I.N., Kryvova, V.V. (1984) Vliyanie plasticheskoy deformatsii na koertsitivnyuy cilu malouglerodistoy stali. Defectoskopia, 6, 90. [in Russian].
6. Gorkunov, E.S., Fedorov, V.P., Bukhvalov, A.B., Veselov, I.N. (1997) Modelirovanie diagrammy deformirovaniya na osnove izmereniya ee magnitnykh characteristic. Ibid, 4, 87– 95 [in Russian].
7. Popov, V.А. (2012) Mify i realnost primeneniya magnitnoy structyroskopii pri otsenke napryazhenno-deformirovannogo sostoyaniya metallokostruktsiy podemnykh sooruzheniy. Podemnye soorusheniya. Spetsialnaya tekhnika, 12, 20–21. [in Russian].
8. Gopkalo, O.P., Nekhotyashhij, V.O., Bezlyud`ko, G.Ya., Kurash, Yu.P. (2019) Diagnostuvannya poshkodzhenosti` austenitnoyi stali` AISI 304 pri mekhanichnomu navantazhenni` po vimirakh koerczitivnoyi sili. Tekhn. diagnostika i nerazrush. Kontrol`, 4, 1-13. [in Ukrainian]. https://doi.org/10.15407/tdnk2019.04.01
9. Ionov, D.V., Popov, V.A. (2013) O praktike primeneniya magnitnoj strukturoskopii dlya vyyavleniya strukturnoj neodnorodnosti v elementakh konstrukczij obektov povyshennoj opasnosti. «Podyomnye sooruzheniya. Speczialnaya tekhnika», 4. [Elektronnij resurs]. Rezhim dostupu : en.tuevdieks. com › articles › sobyitiya-v-mire-diagnostiki-i-ekspertiz › [in Russian].
10. Mikheev, M.N., Gorkunov, E`.S. (1993) Magnitnye metody strukturnogo analiza nerazrushayushhego kontrolya. Moskva, Nauka. [in Russian].
11. Leonov, I.S. (2013) Sovershenstvovanie koerczitimetricheskogo metoda dlya analiza napryazhennogo sostoyaniya neftegazoprovodov. Dis. kand. tekhn. nauk 25.00.19. Ukhta. [in Russian].
12. Malakhov, O.V., Kochergin, A.V., Devyatki, D.S. (2013) Persperktivy primeneniya metoda magnitnoj pamyati metallov k diagnostike sostoyaniya metallov. Vostochno–Evropejskij zhurnal peredovykh tekhnologij ISSN 1729-3774, 4/5 (64), 20–24] [in Russian].
13. Czarkova, T.P., Kuleev, V.G. (2009) Osobennosti magnitouprugogo effekta v plasticheski deformirovannykh ferromagnitnykh stalyakh v slabykh magnitnykh polyakh. Ibid, 108, 3, 227–236. [in Russian].

---

Advertising in this issue:

---