10.14489/td.2020.05.pp.020-027

2020, 05 May

DOI: 10.14489/td.2020.05.pp.020-027

Murashov V. V.
DETECTION OF ADHESION-FREE AREAS AND EXFOLIATIONS IN MULTILAYER STRUCTURES BY THE ACOUSTIC-TOPOGRAPHIC METHOD
(pp. 20-27)

Abstract. Physical the bases of acoustic-topographic method of defektoskopiya of multilayer structures are briefly covered. Installation for implementation of acoustic-topographic method in two options is developed and mounted: with the magnetostrictive activator and with the electromagnetic (shock) activator. By pilot studies it is established that at control by acoustic-topographic method of brazed and welded structures sensitivity of control significantly (in 2–3 times) is higher, than at control by other methods of defektoskopiya. It is established also that the zone of control of multilayer glued structures is much less, than at control of brazed and welded structures. It is shown that the greatest thickness of the upper leaf of structure at which control by acoustic-topographic method with sufficient sensitivity is still possible, is equal to about 1 mm, at control of structures with thickness of the upper leaf initiation of elastic oscillations it is reasonable to carry out over 1 mm in the shock way. Repeated control with change of point of input of ultrasonic oscillations is in certain cases necessary for specification of picture of distribution of powder near initial point of input of oscillations.

Keywords: acoustic-topographic method, ultrasonic oscillations, multilayer structure, testing sensitivity.

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V. V. Murashov (FSUE “VIAM” SSC of the Russian Federation, Moscow, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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