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Interaction of low-frequency axisymmetric ultrasonic guided waves with bends in pipes of arbitrary bend angle and general bend radius
Published in
2014
PMID: 24210413
Volume: 54
   
Issue: 3
Pages: 801 - 808
Abstract
The use of ultrasonic guided waves for the inspection of pipes with elbow and U-type bends has received much attention in recent years, but studies for more general bend angles which may also occur commonly, for example in cross-country pipes, are limited. Here, we address this topic considering a general bend angle φ, a more general mean bend radius R in terms of the wavelength of the mode studied and pipe thickness b. We use 3D Finite Element (FE) simulation to understand the propagation of fundamental axisymmetric L(0, 2) mode across bends of different angles φ. The effect of the ratio of the mean bend radius to the wavelength of the mode studied, on the transmission and reflection of incident wave is also considered. The studies show that as the bend angle is reduced, a progressively larger extent of mode-conversion affects the transmission and velocity characteristics of the L(0, 2) mode. However the overall message on the potential of guided waves for inspection and monitoring of bent pipes remains positive, as bends seem to impact mode transmission only to the extent of 20% even at low bend angles. The conclusions seem to be valid for different typical pipe thicknesses b and bend radii. The modeling approach is validated by experiments and discussed in light of physics of guided waves. © 2013 Elsevier B.V. All rights reserved.
About the journal
JournalUltrasonics
ISSN0041624X
Open AccessNo
Concepts (28)
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    AXIAL BENDS
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    BEND ANGLE
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    Bend radius
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    PIPE INSPECTION
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    Ultrasonic guided wave
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    Guided electromagnetic wave propagation
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    Inspection
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    Ultrasonic waves
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    Article
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    AXIAL BENDS
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    BEND ANGLE
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    Computer simulation
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    Echography
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    Equipment
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    Flow kinetics
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    Methodology
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    PIPE INSPECTION
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    Radiation scattering
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    Sound
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    Theoretical model
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    Ultrasonic guided waves
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    AXIAL BENDS
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    BEND ANGLE
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    PIPE INSPECTION
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    Models, theoretical
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    Rheology
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    Scattering, radiation
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    Ultrasonography