10.14489/td.2018.04.pp.058-063

2018, 04 April

DOI: 10.14489/td.2018.04.pp.058-063

Kireev A. N.
EXPANSION OF APPLICATION DOMAIN OF TWO FREQUENCY METHOD OF FLAW DETECTION AT THE HAND ULTRASONIC TESTING
(pp. 58-63)

Abstract. The actual scientific and technical problem of expanding the application area of the two-frequency flaw detection method with manual ultrasonic testing is solved in the article. The two-frequency method of flaw detection makes it possible to determine the shape of the defect (three-dimensional or planar) with ultrasonic inspection of objects having a plane-parallel ultrasonic wave input surface and a bottom surface. The shape is determined by measuring the amplitudes of the echo signals from the defect and amplitudes of the bottom signals at frequencies of the ultrasonic wave of 2.5 and 5.0 MHz, calculating the shape factor, and comparing it with the boundary values, one of which corresponds to an absolutely planar defect, defect. In the case when the shape factor is not more than 30% different from the corresponding boundary value, the defect is considered either plane or, respectively, volumetric. The article shows analytically that the mathematical apparatus of the two-frequency method can also be extended by ultrasonic inspection in the radial direction of cylindrical objects and cylindrical objects with a central hole. The amplitude from the opposite concave cylindrical surface is determined at the location of the amplitude of the bottom signal in a cylindrical object, and the amplitude from the central cylindrical hole in a cylindrical object with a central cylindrical hole. To automate the calculations using the two-frequency method of flaw detection, the software product NDTRT-07.03 was developed.

Keywords: nondestructive control, acoustic control, ultrasonic control, echo impulsive method, flaw detection, two frequency method, piezoelectric transformer, defect, coefficient of form.

+ - About the Authors Click to collapse

A. N. Kireev (Public Joint Stock Company “Luganskteplovoz”, Lugansk, Ukraina) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

+ - References Click to collapse

1. Badalyan V. G., Bazulin E. G., Vopilkin A. Kh. et al. (2008). Ultrasonic flaw detection of metals with the use of holographic methods. Moscow: Mashinostroenie. [in Russian language]
2. Kireev A. N. (2016). Flaw detection in the ultrasonic diagnosis of elements and systems of rolling stock of railways: monograph. Lugansk: Publishing house "Nolidzh". [in Russian language]
3. Kireev A., Kirichenko I. (2012). Perfection of methods of determination of type of defect at the ultrasonic control of elements of rolling stock of railways. TEKA. Commision of motorization and energetics in agriculture. – Lublin – Lugansk, Vol. 12, № 3, pp. 58-61.
4. Kireev A. N. (2015). Flaw detection with manual testing of railway rolling stock elements and systems by ultrasonic echo method. Vestnik Rostovskogo gosudarstvennogo universiteta putei soobshcheniia, 58(2), pp. 24-30. [in Russian language]
5. Kireev A. N. (2015). Experimental studies of the method of flaw detection at manual ultrasonic inspection of rolling stock elements of railways. V Mire NK, 18(4), pp. 72-75. doi: 10.12737/15939 [in Russian language]

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