10.14489/td.2021.07.pp.004-012

2021, 07 July

DOI: 10.14489/td.2021.07.pp.004-012

Shevaldykin V. G.
CREEPING SURFACE LONGITUDINAL ACOUSTIC WAVE: MAIN PROPERTIES AND APPLICATION POSSIBILITIES
(PP. 4-12)

Abstract. Creeping ultrasonic waves have long been successfully used for flaw detection of near-surface and near-bottom zones of metal products. However, due to the fact that the creeping wave generates a lateral transverse wave directed into the metal volume at the third critical angle, it is also possible to test internal defects in principle. At known velocities of propagation of longitudinal and transverse waves in the metal, the third critical angle is easily calculated. Therefore, the time of propagation of the ultrasonic signal along any trajectory between points on the surface and in the volume of the metal can be calculated. Usually, creeping waves are used to test products of plane-parallel shape. There are no cases of their application on curved surfaces in the literature. It is possible that the creeping wave can also propagate over a concave surface. The aim of the article is to test experimentally new ways of using creeping waves. The propagation trajectories of the creeping and lateral transverse waves were studied on a steel plate. The time of passage of the ultrasonic signal along such trajectories of different lengths was measured, and the measurement results were compared with the calculated time values. The measured and calculated values coincided with accuracy sufficient for the coherent accumulation of echo signals that passed through the metal part of the path by the creeping wave and another part of the path by the lateral transverse wave.The propagation of the creeping wave over a concave surface was studied on a steel sample with cylindrical faces of different radii. As a result, it turned out that on a concave surface, the creeping wave propagates at the same speed of longitudinal waves as on a flat surface, but it decays much more strongly with distance. Studies have shown that creeping waves can be used in ultrasonic tomography, where a preliminary calculation of the propagation trajectories of ultrasonic signals is required. The propagation of creeping waves over concave surfaces extends the capabilities of the TOFD method to the area of intube testing

Keywords: ultrasonic testing, surface-longitudinal wave, lateral wave, creeping wave.

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V. G. Shevaldykin (Acoustic Control Systems Ltd, village Gorki Leninskie, Moscow region, Russia) Е-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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1. Ermolov I. N., Razygraev N. P., Shcherbinskiy V. G. (1978). Using acoustic waves of the head type for ultrasonic testing. Defektoskopiya, (1), pp. 33 – 40. [in Russian language]
2. Yuozonene L. V. (1980). Elastic surface-longitudinal waves and their application for non-destructive testing. Defektoskopiya, (8), pp. 29 – 38. [in Russian language]
3. Werner G. (1973). Neubauer/Ultrasonic reflection of a bounded beam of Rayleigh and critical angles for a plane liquid – solid interface. Journal of Applied Physics, Vol. 44, pp. 48 – 53.
4. Klyuev V. V. (Ed.), Ermolov I. N., Lange Yu. V. (2006). Ultrasonic testing. Non-destructive testing: handbook: in 8 volumes. Vol. 3. 2nd ed. Moscow: Mashinostroenie. [in Russian language]
5. Lange Yu. V., Voronkov V. A. (2003). Non-destructive acoustic control. Terms and definitions: handbook. Moscow: Avtorskoe izdanie. [in Russian language]
6. Viktorov I. A. (1979). Types of sound surface waves in solids. Akusticheskiy zhurnal, 25, pp. 1 – 17. [in Russian language]
7. Krautkremer Y., Krautkremer G. (1991). Ultrasonic inspection of materials: handbook. Moscow: Metallurgiya. [in Russian language]
8. Razygraev N. P. (2004). Ultrasonic nondestructive testing by head waves: physical prerequisites and practical use. Defektoskopiya, (9), pp. 27 – 37. [in Russian language]
9. Davydov E. A., Dyadin V. P., Shekero A. L. (2018). On terminological features in the designation of ultrasonic waves generated at the first critical angle. Tekhnicheskaya diagnostika i nerazrushayushchiy kontrol', (3), pp. 14 – 26. [in Russian language]
10. Shevaldykin V. G. (2020). The use of head waves in ultrasound tomography. XXII All-Russian Conference on Non-destructive Testing and Technical Diagnostics “Transformation of Nondestructive Testing and Technical Diagnostics in the Era of Digitalization. Ensuring the safety of society in a changing world ": a collection of works, pp. 45 – 47. Moscow: Izdatel'skiy dom «Spektr». [in Russian language]
11. Samokrutov A. A., Shevaldykin V. G. (2011). Ultrasound tomography of metal structures using digitaly focused antenna array method. Defektoskopiya, (1), pp. 21 – 38. [in Russian language]
12. Bazulin E. G. (2010). Obtaining images of defects taking into account multiple reflection of ultrasonic pulses from the boundaries of the tested object. Defektoskopiya, (10), pp. 34 – 58. [in Russian language]
13. Ermolov I. N., Razygraev N. P., Shcherbinskiy V. G. (1979). Study of attenuation of ultrasonic head waves with distance. Defektoskopiya, (1), pp. 37 – 40. [in Russian language]
14. Basatskaya L. V., Ermolov I. N. (1980). Theoretical study of ultrasonic longitudinal subsurface waves in solid media. Defektoskopiya, (7), pp. 58 – 65. [in Russian language]
15. Bazulin E. G. (2010). Coherent restoration of defect images taking into account the effect of non-specular reflection of ultrasonic pulses from the boundaries of the test object. Defektoskopiya, (7), pp. 18 – 29. [in Russian language]
16. Shevaldykin V. G. (2020). The use of creeping waves in ultrasound tomography by digital focusing aperture. Izvestiya Akademii elektrotekhnicheskih nauk RF, 22, pp. 66 – 72. [in Russian language]

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