Journal ArticleDOI
Low frequency axisymmetric longitudinal guided waves in eccentric annular cylinders.
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TLDR
The studies show that even a small eccentricity in the pipe can cause a loss in the L(0,2) mode axisymmetry, leading to its confinement in the thinned side of the pipe cross-section and also a reduction in mode velocities.Abstract:
This paper studies the effect of axially uniform eccentricity on the modal structures and velocities of the lower order axisymmetric guided wave mode L(0,2) in circular tubes or pipes. The semi-analytical finite element method is mainly used, supported by fully three-dimensional finite element models and validated using experiments. The studies show that even a small eccentricity in the pipe can cause a loss in the L(0,2) mode axisymmetry, leading to its confinement in the thinned side of the pipe cross-section and also a reduction in mode velocities. The physics of this phenomenon is related to the feature-guiding and mode confinement effects noted in recent years in the literature, particularly studies on waveguides with local cross-section variations and curvature.read more
Citations
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Proceedings ArticleDOI
Fiber Bragg grating-based detection of cross sectional irregularities in metallic pipes
TL;DR: In this article, the authors demonstrate a technique to monitor cross-sectional irregularities in pipes by detecting the feature-guided waves using fiber Bragg grating sensors, which is in good agreement with the results reported in elastic wave literature.
Journal ArticleDOI
Effect of Conical Profile on the Transmission of Elastic Waves From Cylindrical Waveguide to Bulk
TL;DR: In this paper, the authors studied the transmission of elastic waves into test specimens for cylindrical waveguide-based ultrasonic transducers and found that a 50-deg conical transition profile helped achieve better transmission and beam directionality into the specimen and also better reception of the back wall reflections at the waveguide as compared to a simple cylindular rod waveguide.
Dissertation
Investigation of Linear and Nonlinear Torsional Guided Waves in Hollow Circular Cylinders for Damage Detection
TL;DR: Thesis (Ph.D.) as discussed by the authors, University of Adelaide, School of Civil, Environmental and Mining Engineering, 2020, and thesis (M.A., 2019),
References
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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
A Baseline and Vision of Ultrasonic Guided Wave Inspection Potential
TL;DR: In this article, the authors provide a vision of ultrasonic guided wave inspection potential as we move forward into the new millennium and provide a brief description of the sensor and software technology that will make ultrasonic guidance wave inspection commonplace in the next century.
Journal ArticleDOI
Defect detection in pipes using guided waves
TL;DR: In this paper, the authors present a review of the studies of the propagation of the waves and their sensitivity to defects which have been conducted in order to provide a sound scientific basis for the method.
Journal ArticleDOI
Modeling elastic wave propagation in waveguides with the finite element method
TL;DR: In this article, the authors used a commercial finite element (FE) code to study the propagation characteristics of ultrasonic waves in annular structures and demonstrated the potential of the FE method for problems when an analytical solution is not possible because of complicated component geometry.
Journal ArticleDOI
The Reflection of Guided Waves From Circumferential Notches in Pipes
TL;DR: In this article, the reflection of the L(0, 2), axially symmetric guidea elastic wave from notches in pipes is examined, using laboratory experiments and finite element simulation.