METHODS FOR STUDYING FATIGUE CRACK NUCLEATION AND PROPAGATION IN ALUMINUM ALLOYS EXPOSED TO SURFACTANTS
DOI:
https://doi.org/10.18372/0370-2197.2(107).20133Keywords:
fatigue damage, fatigue crack nucleation, fatigue crack propagation, surfactants, corrosion preventive compounds, surface deformation reliefAbstract
The issue described in the paper arises from the growing number of substances interacting with aircraft metallic components. This paper examines newly developed and recommended methods for studying the nucleation and propagation of fatigue cracks in aluminum alloys exposed to surfactants, with a particular focus on corrosion preventive compounds. While many of these compounds exhibit excellent functional properties, their potential side effects have been studied insufficiently and remain unclear, thus targeted experimental investigations are required. Given that the fatigue life of metal components comprises two distinct stages, fatigue crack nucleation and crack propagation, separate analyses are essential to assess the applicability of specific surfactants.
The first stage of the fatigue for many metals is associated with formation of so called surface deformation relief, which constituents are extrusions, intrusions, persistent slip bands. The dislocation nature of these substructures presumes the possibility of their sensitivity to the surfactants. Among the metal exhibiting surface deformation relief there are alclad alloys having layer of the pure aluminium, particular alclad alloys 2024T3, 7075T6 widely used in the aircraft manufacturing, for example for the skin of the fuselage. The intensity of the surface relief evolves with the number of loading cycles, thus providing the information regarding the consumption of the duration of the nucleation stage.
To study the first stage of the fatigue, i.e. fatigue crack nucleation, computer-aided optical analysis of surface deformation relief is proposed as the primary method. The method was tested and proved by numerous tests of aluminium alloys specimens and aircraft structural components. For examining fatigue crack behavior in contact with surfactants, linear fracture mechanics techniques are considered reliable and indispensable. Details of both procedures are described.
References
Karpenko H. V. Vlyianye aktyvnуkh zhydkykh sred na vуnoslyvost staly. Kyiv : Vydavnytstvo AN URSR, 1955. 208 s.
Gavrylov I., Karuskevich M., Ignatovich S., Yutskevych S., Maslak T. Influence of corrosion preventive compounds on the friction force in aircraft lap joints. Fatigue and Fract Eng Materials Struct. 2022. 45. Р. 938–941.
Karuskevich M., Ignatovich S., Gavrylov Ie., Krasnopol’skii V., Dzhavadova I. Actuality and Risks of the Corrosion Preventive Compounds Application in Aviation. Procedia Structural Integrity. 2024. № 59. Р. 175–181.
Havrylov Ye. P., Vlasenko Yu. V., Yutskevych S. S., Yakobchuk O. Ye., Karuskevych O. M. Eksperymentalne i skinchenno-elementne doslidzhennia tertia v aviatsiinykh zaklepkovykh ziednanniakh. Aviatsiino-kosmichna tekhnika i tekhnolohiia. 2024. № 4(196). S. 34–42.
Woods P.J. Low-amplitude fatigue of copper and copper – 5 at % A1 single crystals. Phil. Mag. 1973. V. 28. P. 155-191.
Grego V., Kratochvíl J., Saxlová M. Width and density of persistent slip bands as a consequence of deformation mesostructured. Physics, Experiments, Modelling and Applications, J.Phys : 2nd European Mechanics of Materials Conference on Mechanics of Materials with Intrinsic Length Scale, IV France 08, 1998. P. 8.181-8.188.
Karuskevich M, Karuskevich O, Maslak T, Schepak S. Extrusion/intrusion structures as quantitative indicators of accumulated fatigue damage. International Journal of Fatigue. 2012. Vol. 39. Р. 116–121.
Karuskevich M.V., Maslak T.P. Accelerated method for the alclad alloy fatigue curve construction by the surface relief pattern. Fatigue and Fracture of Engineering Materials and Structures. 2021. Vol. 44(10). P. 2913–2916.
Pejkowski Ł, Karuskevich M, Maslak T. Extrusion/intrusion structure as a fatigue indicator for uniaxial and multiaxial loading. Fatigue Fract Eng Mater Struct. 2019. Vol. 42, Issue 10. P. 2315–2324.
Zasimchuk E.E, Radchenko A.I, Karuskevich M.V. Single-crystals as an indicator of fatigue damage. Fatigue Fract Eng Mater Struct. 1992. Vol. 12. P. 1281–1283.
Havrylov Ye. P., Ihnatovych S. R., Karuskevych M. V., Maslak T. P., Karuskevych O. M. Kompleksnyi pidkhid do vyboru plivkoutvoriuiuchykh antykoroziinykh spoluk dlia zakhystu aviatsiinykh konstruktsii vid korozii. Aviatsiino-kosmichna tekhnika i tekhnolohiia. 2024. № 4, spetsvypusk 2 (198). S. 31–37.
Konspekt lektsii z dystsypliny «Mekhanika ruinuvannia» dlia ruinuvannia dennoi formy navchannia za napriamom 6.060101 «Budivnytstvo» ta 192 «Budivnytstvo ta tsyvilna inzheneriia» / Ukladachi: P. V. Yasnii, V. P. Yasnii. – Ternopil : Terno-pilskyi natsionalnyi tekhnichnyi universytet imeni Ivana Puliuia, 2018. 116 s.
Iasnii P.V., Yasnii V.P. Mekhanika ruinuvannia : konspekt lektsii. Ternopil : Ternopilskyi natsion. tekhn. u-tet imeni Ivana Puliuia, 2018. 116 s.
O'Neill P.H. A short study of the effect of a penetrant oil on the fatigue life of a riveted joint. Aeronautical research council. 1975. Current paper No.1305. URL: https://reports.aerade.cranfield.ac.uk/bitstream/handle/1826.2/1318/arc-cp-1305.pdf?sequence=1&isAllowed=y (data zvernennia: 09.05.2025).
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