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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Journal ArticleDOI
Shear horizontal feature guided ultrasonic waves in plate structures with 90° transverse bends.
TL;DR: Semi-Analytical Finite Element (SAFE) method simulations reveal the existence of a new family of Shear Horizontal (SHB) type of FGW mode in 90° bends in plate structures, demonstrating the SH-like nature of a bend-confined mode identified in studies of power flow across the bend.
Journal ArticleDOI
Interaction of shear horizontal bend (SHB) guided mode with defects
TL;DR: In this article, the interaction of the SHB wave with transverse and longitudinal defects in the bend region is studied using 3D finite element simulations validated by experiments, and the results show that SHB mode yields improved through-thickness defect resolution capabilities as compared to regular plate guided SH waves in view of mode confinement and higher frequencies used.
Journal ArticleDOI
Feature-guided wave-based health monitoring of bent plates using fiber Bragg gratings:
TL;DR: In this article, a fiber Bragg grating based technique was proposed to detect anomalies or defects in plate structures with transverse bends, both in the case of defect-free and transverse defects.
Journal ArticleDOI
Monitoring pipe wall integrity using fiber Bragg grating-based sensing of low-frequency guided ultrasonic waves.
TL;DR: Fiber Bragg gratings are shown to be effective in detecting changes to L(0,2) modal characteristics, providing a novel route to health monitoring of pipe assets.
Journal ArticleDOI
Longitudinal guided waves confined in radius filler regions of composite joints.
TL;DR: Semi-analytical finite element simulations are used to demonstrate the existence of a longitudinal guided ultrasonic mode confined or trapped in the Noodle regions, and reveal that this mode has attractive properties for rapid screening of Noodle joints, including strong energy concentration, low dispersion, and attenuation.
References
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Journal ArticleDOI
SHM of pipes using torsional waves generated by in situ magnetostrictive tapes
TL;DR: In this article, an improved magnetostrictive sensors (MsSs) were used for structural health monitoring (SHM) of hard-to-inspect pipes using polymeric magnetic tape material that is suitable for use in a variety of industries.
Journal ArticleDOI
Elastic waves guided by a welded joint in a plate
Zheng Fan,Michael J. S. Lowe +1 more
TL;DR: In this paper, a two-dimensional semi-analytical finite element (SAFE) method is applied to provide a modal study of the elastic waves that are guided by the welded joint in a plate.
Journal ArticleDOI
The Effect of Bends on the Propagation of Guided Waves in Pipes
TL;DR: In this article, the dispersion curves for toroidal structures have been calculated using a finite element method, as there is no available analytical solution, and the factors affecting the transmission and reflection behavior have been identified by studying a straight-curved-straight structure both numerically and experimentally.
Journal ArticleDOI
Scattering of the fundamental shear horizontal guided wave by a part-thickness crack in an isotropic plate.
TL;DR: The interaction of the fundamental shear horizontal (SH0) guided mode with part-thickness cracks in an isotropic plate is studied as an extension within the context and general framework of previous work and theoretical analysis is used to understand the physical basis for such behavior.
Proceedings ArticleDOI
Dispersion and excitability of guided acoustic waves in isotropic beams with arbitrary cross section
TL;DR: In this paper, a finite element (FE) technique for computing the properties of guided waves that can exist in an isotropic beam of arbitrary cross section is presented, which uses a two-dimensional mesh to represent a cross section through the beam and cyclic axial symmetry conditions to prescribe the displacement field perpendicular to the mesh.