Affiliation:
1. Anhui University of Science and Technology
2. Beijing University of Technology
Abstract
Ultrasonic methods are used in a wide variety of applications including medical studies, geological mapping, and nondestructive evaluation (NDE) tests. In the field of ultrasonic NDE, it is necessary to treat inverse problems of various types. The objective of this paper is to predict the flaw response in an inhomogeneous solid medium. A mathematical modelling of the testing situation is very valuable for a number of reasons. The modelling helps in developing physical intuition and in the interpretation of tests. Multi-Gaussian Beam (MGB) model is used to represent the incident ultrasonic beam. The effect of ultrasonic attenuation and phase velocity dispersion due to grain scattering is included in the predictions. The variation of received voltage is analyzed against the distance of the flaw from the transducer for different dimensions of a square cylinder void. The effect of variation of mean diameter of the grains on the received voltage for different domain of interest is also studied.
Publisher
Trans Tech Publications, Ltd.
Reference19 articles.
1. S. Ahmed, R. B. Thompson, and P. D. Panetta, Ultrasonic attenuation as influenced by elongated grains, Review of Progress in QNDE, 21(2003), 109-116.
2. S. Ahmed, and R. B. Thompson, Propagation of elastic waves in equiaxed stainless steel polycrystals with aligned.
3. axes, J. Acoust. Soc. Am., 99(1996), 2086-(2096).
4. L. W. Schmerr, Fundamentals of Ultrasonic Nondestructive Evaluation-A modeling Approach, Plenum press, New York, (1988).
5. J. J. Wen, and M. A. Breazeale, A diffraction beam field expressed as the superposition of Gaussian beams, J. Acoust. Soc. Am. 83(1988), 1752-1756.