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	Comparison of application results of two speckle methods for study multi-cycle fatigue of structural steel</div>

Vladimirov Alexandr P., Kamantsev Ivan S. , Drukarenko Nikita A., Myznov Konstantin E. , Naumov Konstantin V.

2024 , VOLUME 24, NUMBER 1 ( january-february )

ISSN 2226-1494 (print), ISSN 2500-0373 (online)

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Nikiforov
Vladimir O.
D.Sc., Prof.

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doi: 10.17586/2226-1494-2024-24-1-20-29

Comparison of application results of two speckle methods for study multi-cycle fatigue of structural steel

A. P. Vladimirov, I. S. Kamantsev, N. A. Drukarenko, K. E. Myznov, K. V. Naumov

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Vladimirov A.P., Kamantsev I.S., Drukarenko N.A., Myznov K.E., Naumov K.V. Comparison of applications results of two speckle methods for study multi-cycle fatigue of structural steel. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2024, vol. 24, no. 1, pp. 20–29 (in Russian). doi: 10.17586/2226-1494-2024-24-1-20-29

Abstract

The new method of time-averaged speckle images and the well-known method of speckle-field interference studied the development of plastic deformations occurring during multicycle fatigue of structural steel. The correctness of strain determination by the new method is evaluated by comparing the data obtained by the two methods. Two optical systems including laser modules with different wavelengths were investigated. The proposed optical system allows to determine the components Δuy, Δuz of the relative displacement vector of two surface points located at a distance (measurement base) Δs = 66 μm. The known scheme makes it possible to describe deformations by the traditional method on the base of 470 μm. The object of study was a flat specimen made of 09Г2С steel with two side notches. Fatigue tests were carried out on a resonance-type machine at different cycle amplitudes. It is shown that at all cycle amplitudes the development of plastic deformations occurs by the mechanism of cyclic creep. There is a good correlation between the data obtained by two different speckle methods. At the same time, the strain estimated by the new method is in some cases an order of magnitude higher than the strain calculated by the known method. Obviously, this is due to the existence of local small- sized (of the order of 10¹ µm) strain areas which cannot be measured by conventional methods. The ultimate tensile strain Δuy/Δs calculated by the new method is of the order of 10^–1, which coincides with the similar strain occurring in tensile testing of standard specimens. The results obtained by the new method justify the need of developing sensors and nondestructive testing devices of a new generation, allowing to estimate the time to fatigue crack initiation by the rate of change of physical quantities and by their limit values.

Keywords: high-cycle fatigue, steel, destruction, speckles, interference, free space, image

Acknowledgements. The research was carried out within the state assignment of the Ministry of Science and Higher Education of the Russian Federation under the topic no. АААА-18-118020790148-1 and “Diagnostics” no. 122021000030-1. The equipment of the Collective Center “Plastometria” at Institute of Engineering Science of Ural Branch of the Russian Academy of Sciences was used for this work.

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