scholarly journals Hybrid active focusing with adaptive dispersion for higher defect sensitivity in guided wave inspection of cylindrical structures

2015 ◽  
Vol 31 (3) ◽  
pp. 219-234 ◽  
Author(s):  
P. S. Lowe ◽  
R. Sanderson ◽  
N. V. Boulgouris ◽  
T. H. Gan
Keyword(s):  
Guided Wave ◽  
Cylindrical Structures ◽  
Defect Sensitivity

scholarly journals Inspection of Cylindrical Structures Using the First Longitudinal Guided Wave Mode in Isolation for Higher Flaw Sensitivity

2016 ◽  
Vol 16 (3) ◽  
pp. 706-714 ◽  
Author(s):  
Premesh Shehan Lowe ◽  
Ruth M. Sanderson ◽  
Nikolaos V. Boulgouris ◽  
Alex G. Haig ◽  
Wamadeva Balachandran
Keyword(s):  
Wave Mode ◽  
Guided Wave ◽  
Cylindrical Structures ◽  
Flaw Sensitivity

Acoustic Wave Propagation Simulation in Double-Layered Composite Cylindrical Structures

2013 ◽  
Author(s):  
Jikai Du
Keyword(s):  
Wave Propagation ◽  
Carbon Fiber ◽  
Fiber Orientation ◽  
Guided Waves ◽  
Layered Composite ◽  
Guided Wave ◽  
Ultrasound Wave ◽  
Ultrasound Guided ◽  
Cylindrical Structures ◽  
Guided Wave Propagation

Ultrasound guided waves have been recognized as an effective tool for the rapid and long-range inspection of composite cylindrical structures, but its application is still limited due to the complex nature of guided waves and their interactions with material geometry and material properties. This paper uses finite element technique to simulate the ultrasound guided wave propagation in layered composite cylinders. Ultrasound guided wave propagation was analyzed in a double-layered cylinder composed of an anisotropic unidirectional carbon fiber/epoxy resin composite layer wrapped on an isotropic aluminum cylinder. The carbon fiber orientation is either along the cylinder circumferential direction or axial direction. Ultrasound wave is excited from a PZT-4 transducer which is placed on the top of a Plexiglas wedge to adjust the ultrasound incident angle into the cylinder. Low ultrasound frequencies at 0.5 and 1.0 MHz were selected to improve the effect of attenuation and simulation efficiency. Wave propagation velocities and wave structures were analyzed at various positions of the cylinder. This study helped to examine the effect of fiber orientation on wave dispersion characteristics and to assess the feasibility of applying ultrasound guided wave technique for the evaluation of composite cylindrical structures.

Near-field wave enhancement and ‘quasi-surface’ longitudinal waves in a segmented thick-walled hollow cylindrical waveguide

2017 ◽  
Vol 17 (2) ◽  
pp. 346-362 ◽  
Author(s):  
Aleksandra Ziaja-Sujdak ◽  
Li Cheng ◽  
Rafal Radecki ◽  
Wieslaw Jerzy Staszewski
Keyword(s):  
Damage Identification ◽  
Near Field ◽  
Wave Interaction ◽  
Guided Wave ◽  
Enhancement Effect ◽  
Cylindrical Structures ◽  
Structural Evaluation ◽  
Identification Technique ◽  
Wave Phenomena ◽  
Field Wave

Thick-walled structures with varying geometry are challenging for guided wave inspection due to the multimodal behaviour and the complex scattering of the wave modes. This article investigates the influence of the geometrical transitions on the propagation of the elastic waves in thick-walled cylindrical structures and proposes a structural evaluation technique based on the identified wave phenomena. In particular, a near-field wave enhancement effect caused by the crack-wave interaction and by the thickness changes in a waveguide is explored. Additionally, formation and propagation of the so-called longitudinal ‘quasi-surface’ waves are investigated, as they are found to be a main contributor to the observed wave enhancement phenomenon. The proposed new damage identification technique utilising the enhancement effect is validated numerically and experimentally on a beam and a hollow cylindrical structure.

Monitoring internal corrosion in steel pipelines: a two-step helical guided wave approach for localization and quantification

2020 ◽  
pp. 147592172097013
Author(s):  
Stylianos Livadiotis ◽  
Arvin Ebrahimkhanlou ◽  
Salvatore Salamone
Keyword(s):  
Eikonal Equation ◽  
Guided Wave ◽  
Ultrasonic Waves ◽  
Energy Ratio ◽  
Reconstruction Technique ◽  
Accelerated Corrosion ◽  
Internal Corrosion ◽  
Cylindrical Structures ◽  
Damage Coefficient ◽  
Accelerated Corrosion Test

This article presents a two-step approach for the assessment of internal corrosion in cylindrical structures using helical guided ultrasonic waves. The approach consists of two steps such as (1) localization and (2) estimation of the size of the corroded area. Localization is performed with the algebraic reconstruction technique where the energy ratio of the two fundamental Lamb modes S0 and A0 is used as input damage coefficient. Using the output of the localization step, the size of the corroded area is estimated by iteratively solving the eikonal equation using a finite-difference approach. The proposed approach is validated by an accelerated corrosion test. Furthermore, numerical simulations are carried out to study the interaction of the energy ratio and the phase velocity travel time with various thickness profiles acquired from the experiment. The proposed approach is validated against the experimental data up to approximately 50% thickness loss.

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