10.14489/td.2017.09.pp.040-045

2017, 09 September

DOI: 10.14489/td.2017.09.pp.040-045

Poupan A. V.
SURFACE WAVE TRANSDUCER ECHO SIGNAL SHAPE ANALYSIS AT ULTRASONIC TESTING
(pp. 40-45)

Abstract. Ultrasonic wave movement emitting by a surface wave transducer is investigated. Some effects such as wave’s movement along a curved surface, sharp edge crossing, volume wave transformation, transversal wave presence in surface wave transducer’s emission and wave interference in thin plates are common. It could be possible to show the most important behavior of ultrasonic wave movement using a standard specimen which contains both sharp edges and a curved surface. Moreover, small cylindrical hole drilled in the standard specimen is suitable for transversal wave appearance studying. The standard specimen called SO-3R is produced according to State Standard GOST 18576–96. It contains several cylindrical drilled holes and sharp edges and a curved surface. Sharp edge influence and transversal wave appearance effect in echo signal are shown. Surface wave suppression is able to rich considerable amount in case of suppressor placing at the wave path. A wetted finger as a surface wave suppressor is available. Received results are applied to fatigue cracks researching. Growth direction changing and shadow influence in thermal fatigue cracks volume grid are mentioned.

Keywords: ultrasonic testing, surface wave, transversal wave, surface wave transducer, echo signal.

+ - About the Authors Click to collapse

A. V. Polupan (LLC Lenstroiekspertiza, St. Peterburg, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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