Identification of Voids and Cracks by Ultrasonic Technique

Author:

Her Shiuh Chuan1,Chang Ming Chih2

Affiliation:

1. Yuan Ze University

2. Yuan-Ze University

Abstract

Ultrasonic is one of the most wide use of nondestructive evaluation technique. Voids and cracks are the most common defects in a solid. In this investigation, the ultrasonic technique is used to distinguish the defects between the void and crack. As an incident wave impinges on the crack tip, the diffractive wave can be detected from various angles. The amplitude of the diffraction is dependent on the receiving angle. For a void, the incident wave is scattered, the amplitude of the scattering wave is also dependent on the receiving angle. By comparing the amplitudes between the diffractive wave and the scattering wave, one is able to identify the defect of a void or a crack from the other. In this work, 5MHz of longitudinal and shear transducers are used and placed in a variety of incident and receiving angles to examine the difference between the void and crack. The experimental results are validated by the theoretical calculation. In order to identify the void and crack, it is required to have significant difference between the diffractive and scattering waves. The range of the detecting angle, which possesses a meaningful difference between the diffractive and scattering waves, is proposed through the numerical and experimental study to help the identification of the void and crack.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,General Materials Science

Reference6 articles.

1. Gruber, G. J. Defect Identification and Sizing by the Ultrasonic Satellite-Pulse Technique., Journal of Nondestructive Evaluation. Vol. 1 No. 4 (1980) pp.263-276.

2. Silk, M. D. Sizing Crack-Like Defects by Ultrasonic Wave., Proc. First. Intern. Symp. Ultrasonic Materials Characterization 1978. (1980) pp.29-36.

3. Lloyd, E. A. An Ultrasonic Shear-Wave Method for Measuring the Depth of Surface-Breaking Cracks., British journal of non-destructive testing. (1975) pp.172-175.

4. Lidington, B. H. and Silk, M. G. Crack Depth Measurement Using a Single Surface Wave Probe., British journal of non-destructive testing. (1975) pp.165-167.

5. Chiou, C. -P. and Schmerr, L. W. Quasi Pulse-Echo Ultrasonic Technique for Flaw Classification., Ultrasonics. Vol. 29 (1991) pp.471-481.

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