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Fundamentals of Ultrasonic Nondestructive Evaluation

01 Jan 1998-
About: The article was published on 1998-01-01. It has received 333 citations till now. The article focuses on the topics: Nondestructive testing.
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Journal ArticleDOI
TL;DR: In this article, the propagation of finite-amplitude waves in a homogeneous, isotropic, stress-free elastic plate is investigated theoretically, and perturbation is used to obtain solutions of the non-linear equations of motion for harmonic generation in the waveguide.

330 citations

Journal ArticleDOI
TL;DR: In this paper, a review of the most important techniques in quantitative ultrasonics, particularly for crack detection and for the determination of elastic constants, is presented, and the important role of measurement models is emphasized.

284 citations

Journal ArticleDOI
TL;DR: In this article, two types of fiber Bragg gratings (FBGs) ultrasonic sensing system were constructed using different light source: a broadband light source and a tunable laser source.

135 citations

Journal ArticleDOI
TL;DR: It is demonstrated how measurement of the scattering coefficient matrix of a cracklike defect can be used to obtain its size, shape, and orientation.
Abstract: Ultrasonic nondestructive evaluation is used for detection, characterization, and sizing of defects. The accurate sizing of defects that are of similar or less size than the ultrasonic wavelength is of particular importance in assessing structural integrity. In this paper, we demonstrate how measurement of the scattering coefficient matrix of a cracklike defect can be used to obtain its size, shape, and orientation. The scattering coefficient matrix describes the far field amplitude of scattered signals from a scatterer as a function of incident and scattering angles. A finite element (FE) modeling procedure is described that predicts the scattering coefficient matrix of various cracklike defects. Experimental results are presented using a commercial 64-element, 5 MHz array on 2 aluminum test samples that contain several machined slots and through thickness circular holes. To minimize the interference from the reflections of neighboring defects, a subarray approach is used to focus ultrasound on each target defect in turn and extract its scattering coefficient matrices. A circular hole and a fine slot can be clearly distinguished by their different scattering coefficient matrices over a specific range of incident angles and scattering angles. The orientation angles of slots directly below the array are deduced from the measured scattering coefficient matrix to an accuracy of a few degrees, and their lengths are determined with an error of 10%.

128 citations

Journal ArticleDOI
TL;DR: In this article, the amplitude and angular variation of acoustic emission (AE) events due to matrix cracking and delamination in large quasi-isotropic composite plate specimens are reported and a procedure for determining the minimum specimen size necessary to make quantitative measurements is presented.
Abstract: Quantitative measurements of the amplitude and angular variation of acoustic emission (AE) events due to matrix cracking and delamination in large quasi-isotropic composite plate specimens are reported. A procedure for determining the minimum specimen size necessary to make quantitative measurements is presented. The amplitude of AE events is quoted as the absolute surface displacement of different guided wave modes and can therefore be used as the input to forward models of the AE process. Matrix cracking events are found to be dominated by the S0 guided wave mode and have a pronounced amplitude variation with angle. Events due to delamination growth are dominated by the A0 guided wave mode and have no clear angular dependence.

112 citations


Cites methods from "Fundamentals of Ultrasonic Nondestr..."

  • ...[10] used a linear time-invariant (LTI) systems approach [11] to simulate dispersion, attenuation and reflection or transmission, using data from AE source characterisation experiments as an input....

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