Journal ArticleDOI
Mode conversion behavior of SH guided wave in a tapered plate
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In this paper, the authors explored mode conversion of shear horizontal (SH) guided wave when it impinges on smooth defects in plates and found that the fundamental (SH 0 ) and the first higher (SH 1 ) modes exhibited unique mode conversion behaviors in tapered edge.Abstract:
The present study explores mode conversion of shear horizontal (SH) guided wave when it impinges on smooth defects in plates. The fundamental (SH 0 ) and the first higher (SH 1 ) modes were selectively generated by an electromagnetic acoustic transducer in aluminum plates and the propagating modes at various points were detected by a pinducer. The defects had a flat bottom region and tapered edges. Remaining thickness at the bottom defected region was smaller than the so-called cut-off thickness of SH 1 mode. Both modes exhibited unique mode conversion behaviors in tapered edge, which were interpreted with the dispersion relation. Total reflection of SH 1 mode was also observed at a specific condition. Numerical simulation revealed that the continuous wavenumber change in the tapered region and the consequent zero value at cut-off thickness cause this total reflection.read more
Citations
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Journal ArticleDOI
Circumferential guided wave EMAT system for pipeline screening using shear horizontal ultrasound
TL;DR: In this article, a pipe screening tool for petrochemical pipelines both topside and subsea is presented, using Shear Horizontal (SH) guided waves propagating circumferentially around the pipe whilst the scanner is moved axially along the length.
Journal ArticleDOI
Shear horizontal wave transducers for structural health monitoring and nondestructive testing: A review.
Hongchen Miao,Faxin Li +1 more
TL;DR: In this paper, a review of the state-of-the-art SH wave transducers for structural health monitoring (SHM) and nondestructive testing (NDT) is presented.
Journal ArticleDOI
The choice of ultrasonic inspection method for the detection of corrosion at inaccessible locations
Pouyan Khalili,Peter Cawley +1 more
TL;DR: In this paper, the authors present a systematic analysis of the defect detection performance of each method with sharp and gradual defects, as well as their sensitivity to attenuative coatings, liquid loading, surface roughness and ability to test beyond features such as T-joints.
Journal ArticleDOI
An overview of major methods for inspecting and monitoring external corrosion of on-shore transportation pipelines
TL;DR: In this article, the advantages and limitations of major inspection tools that are used to ensure pipeline integrity, and electrochemical corrosion sensors that are designed to monitor pipeline corrosion processes and rates.
Journal ArticleDOI
Shear horizontal (SH) ultrasound wave propagation around smooth corners
TL;DR: Models suggest that the reflection is a linear superposition of the reflections from each bend segment, such that sharp turns lead to a larger peak-to-peak amplitude, in part due to increased phase coherence.
References
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Book
Acoustic Fields and Waves in Solids
TL;DR: In this article, the authors apply the material developed in the Volume One to various boundary value problems (reflection and refraction at plane surfaces, composite media, waveguides and resonators).
Book
EMATs for Science and Industry: Noncontacting Ultrasonic Measurements
Masahiko Hirao,Hirotsugu Ogi +1 more
TL;DR: In this paper, the authors present a survey of EMAT techniques and their applications in the industrial domain, including on-line texture monitoring of steel sheets and in-situ monitoring of Dislocation Mobility.
Journal ArticleDOI
Numerical modeling of elastic wave propagation and scattering with EFIT — elastodynamic finite integration technique
TL;DR: In this paper, the basic equations of EFIT, the Elastodynamic Finite Integration Technique, are formulated for anisotropic inhomogeneous media in 3D, and the discrete equations on a staggered grid resulting in a unique way to discretize material parameters, and evaluate stability conditions and consistency for isotropic homogeneous unbounded media.
Journal ArticleDOI
An SH-wave EMAT technique for gas pipeline inspection
Masahiko Hirao,Hirotsugu Ogi +1 more
TL;DR: In this paper, a periodic-permanent-magnet (PPM) EMAT is placed inside the pipe, which generates and receives the SH guided waves traveling in the circumferential direction with the axial polarization.
Journal ArticleDOI
Estimation of ultrasonic guided wave mode conversion in a plate with thickness variation
TL;DR: In this paper, a hybrid boundary element method aimed at analyzing Lamb wave scattering from defects can provide us with an excellent numerical tool for tackling complicated mode conversion phenomena under waveguide thickness variation, which can be used to improve inspection sensitivity and penetration power for a variety of practical NDE applications.