Journal ArticleDOI
The excitation of Lamb waves in pipes using dry-coupled piezoelectric transducers
D. N. Alleyne,Peter Cawley +1 more
Reads0
Chats0
TLDR
In this article, the development of a dry-coupled piezoelectric transducer system for the detection of corrosion in chemical plant pipework using cylindrical Lamb waves is described.Abstract:
The development of a dry-coupled piezoelectric transducer system for the detection of corrosion in chemical plant pipework using cylindrical Lamb waves is described. It is shown that the axisymmetricL(0,2) mode at a frequency of about 70 kHz is an attractive mode to use for longdistance propagation. The results show that a ring of piezoelectric length-expander elements can be used to excite theL(0,2) mode and to suppress all the nonaxisymmetric modes. Tests have been carried out both with the piezoelectric elements bonded to the pipe and fabricated into a simple transducer which was clamped against the pipe. The performance of the dry-coupled system was very similar to that of the bonded elements. In pulse echo tests, the noise floor obtained with the dry-coupled system was less than 1% of the amplitude of the propagatingL(0,2) mode. The drycoupled transducers provide a simple, light, readily detachable system for the long-range inspection of pipework.read more
Citations
More filters
Journal ArticleDOI
Development of ultrasonic guided wave inspection methodology for steam generator tubes of prototype fast breeder reactor.
TL;DR: The thermal expansion bend of an SG tube shows that the bend does not have much influence on the mode and the multiple circumferential defects considered in the bend are detected with good sensitivity and excellent correlation between finite element simulation and experimental results.
Journal ArticleDOI
Development of in-bore magnetostrictive transducer for ultrasonic guided wave based-inspection of steam generator tubes of PFBR.
TL;DR: An in-bore magnetostrictive transducer is designed for the steam generator tubes of Prototype fast breeder reactor for the generation of L(0,2) modes of frequencies in the range of 250-350 kHz and an excellent agreement is observed between the experimentally measured group velocities with those obtained from the dispersion curves in this frequency range.
Journal ArticleDOI
Detecting and describing a notch in a pipe using singularities
TL;DR: In this article, a hybrid semi-analytical finite element (SAFE) and standard finite element procedure is adopted to simulate ultrasonically generated waves traveling in an infinitely long steel pipe having an open, rectangular notch.
Journal ArticleDOI
Experimental Investigation of Mode Conversions of the T(0,1) Mode Guided Wave Propagating in an Elbow Pipe
TL;DR: In this paper, a method for a preferential detection of the torsional modes was proposed on the basis of the circumferential wave structures of the modes, which was utilized for investigations of mode conversions.
Journal ArticleDOI
The sensitivity of surface guided modes to the bond quality between a concrete block and a composite plate.
TL;DR: The phase velocities are in good agreement with the predicted dispersion curves, thus showing the potential of the ultrasonic guided mode to control the quality of bonds in such structures.
References
More filters
Book
Wave Motion in Elastic Solids
TL;DR: In this article, a comprehensive study of elastic wave propagation in solids is presented, ranging from the theory of waves and vibrations in strings to the three-dimensional theory of elastic waves in thick plates.
Journal ArticleDOI
Matrix techniques for modeling ultrasonic waves in multilayered media
TL;DR: This paper presents a review of the main developments of the matrix techniques, and their use in response and modal models, with emphasis on ultrasonics applications.
Journal ArticleDOI
Three‐Dimensional Investigation of the Propagation of Waves in Hollow Circular Cylinders. I. Analytical Foundation
TL;DR: In this paper, the propagation of free harmonic waves along a hollow circular cylinder of infinite extent is discussed within the framework of the linear theory of elasticity, and a characteristic equation appropriate to the circular hollow cylinder is obtained by use of the Helmholtz potentials for arbitrary values of the physical parameters involved.
Journal ArticleDOI
Optimization of Lamb wave inspection techniques
D. N. Alleyne,Peter Cawley +1 more
TL;DR: In this article, the authors discuss the selection of the appropriate mode and frequency range for different inspection requirements and review the possible methods of excitation, response measurement and signal processing, and show that the presence of defects can be detected reliably from changes in the shape of the received waveform.
Journal ArticleDOI
The propagation in metal tubing of ultrasonic wave modes equivalent to Lamb waves
M.G. Silk,K.F. Bainton +1 more
TL;DR: In this article, it is shown that the L(0, 1) mode, which is comparable to the A0 Lamb wave mode in flat plate, can be generated with acceptable efficiency.
Related Papers (5)
The propagation in metal tubing of ultrasonic wave modes equivalent to Lamb waves
M.G. Silk,K.F. Bainton +1 more