10.14489/td.2019.04.pp.036-044

2019, 04 April

DOI: 10.14489/td.2019.04.pp.036-044

Lozhkova D. S., Krasnov I. S., Dalin M. A.
ULTRASONIC IMMERSION TESTING OF BARS WITH CURVILINEAR SURFACE АFTER EQUIPMENT CALIBRATION ON THE FLAT SPECIMENS
(pp. 36-44)

Abstract. The increasing requirements of design engineers to nondestructive testing sensitivity and completeness of finished part contour in the forging provide the need of ultrasonic immersion testing from its cylindrical surfaces. The presented work was directed at the determination of correction coefficients which equalize the ultrasonic testing sensitivity for objects with curvilinear surface after ultrasonic equipment calibration on the specimens with flat surface. The correction coefficients were found with mathematical modeling using. Simulated echo waveform with mathematical modeling using was calculated at frequency domain. Electric path’s parameters of equipment which is used during serial testing and acoustic properties of the substance were also considered. Longitudinal oscillations were observed at this work. Experimental validation of mathematical modeling data using real specimens with different internal reflectors was made. Nickel based superalloy and aluminum alloy specimens with curvilinear surfaces were used. Flat bottom hole reflectors’ diameters were varied from 2,0 to 3,2 mm, their depths were varied from 5,0 to 50,0 mm. Focused transducers with 5 and 10 MHz central frequencies were used at experiment. The error of mathematical modeling was defined. The correction coefficients leveling sensitivity for depth increasing were calculated. Main directions of mathematical model’s improvement were defined.

Keywords: automated ultrasonic testing, mathematical modeling of physical processes, correction coefficients, focused transducers, engine’s critical parts, nickel based super alloy.

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D. S. Lozhkova, I. S. Krasnov, M. A. Dalin (Federal State Unitary Enterprise “All-Russian Scientific Research Institute of Aviation Materials”, Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра. , Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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