Shear-wave time of flight diffraction (S-TOFD) technique

Baskaran, G.; Balasubramaniam, Krishnan; Rao, C. Lakshmana

doi:10.1016/j.ndteint.2006.01.003

Cited by 58 publications

(17 citation statements)

References 12 publications

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“…If a crack or other defect is present within the scanned volume, the received signal will exhibit a lower intensity. However, the technique does not have the possibility to estimate the depth from the surface to the defect [34,35].…”

Section: Ultrasonic Methodsmentioning

confidence: 99%

“…In [41] Chang and Hsieh proposed a double-probe TOFD imaging method to detect nonhorizontal flaws which could not be detected by the use of the common pulse-echo technique. Baskaran et al Proposed in [35] the shear-wave time-of-flight-diffraction (S-TOFD) with the objective of achieving higher accuracy during near-surface inspection. Furthermore, the signal processing technique called Embedded Signal Identification Technique (ESIT) [42] was adapted to further increase accuracy.…”

Section: Ultrasonic Methodsmentioning

confidence: 99%

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A review of fatigue damage detection and measurement techniques

Bjørheim

Siriwardane

Pavlou

2022

International Journal of Fatigue

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A vast amount of research has been carried out towards the goal of quantifying changes related to the fatigue damaging process in materials throughout the fatigue life. However, no recommended practice has been developed for the experimental measurement of fatigue damage before a macroscopic crack has been initiated. Therefore, this paper reviews the existing fatigue damage detection and measurement techniques on the basis of both momentum within the research field and their being considered non-destructive. The techniques are separated into two categories, namely, fatigue crack monitoring and fatigue damage monitoring. The parameters of these techniques, which quantify the physical and mechanical changes of the materials during the fatigue life, were critically reviewed in regard to the mechanism behind the change, limitations, shortcomings, etc. The acoustic emission, hardness, ultrasonic, magnetic and potential drop methods are applicable for in-situ measurements while positron annihilation and X-ray diffraction are more suitable for laboratory assessments. Even though all the revived methods are applicable for metals, acoustic emissions, X-ray diffraction, ultrasonic, strainbased and thermometric methods are also suitable for composites. The reliability, advantages, weaknesses, case/ material dependency and applicability of each method are compared and tabulated for making a framework for choosing suitable technique for fatigue crack or damage detection of material or components.

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Section: Ultrasonic Methodsmentioning

confidence: 99%

Section: Ultrasonic Methodsmentioning

confidence: 99%

A review of fatigue damage detection and measurement techniques

Bjørheim

Siriwardane

Pavlou

2022

International Journal of Fatigue

View full text Add to dashboard Cite

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“…The TOF estimation is carried out in different applications including non-destructive testing and evaluation (NDT&E) [1][2][3][4], medical imaging [5], and ultrasonic object detection [6]. In ultrasonic NDT&E, techniques based on TOF, such as time of flight diffraction (TOFD) [7] and relative arrival time technique (RATT) [8,9], are commonly used because they provide excellent probability of detection (POD) and accurate measurement of defects [5,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Estimating ultrasonic time of flight using envelope and quasi maximum likelihood method for damage detection and assessment

2012

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“…Accordingly, signal processing has been studied for accurate detection of defects. 6,7) The phased-array method 8) and the time-of-flight diffraction (TOFD) method 9) have recently attracted attention, since the resulting twodimensional (2D) images facilitate understanding of the defect condition and enhance inspection reliability. Komura et al 10) applied these methods to the inspection of welding in a nuclear power plant.…”

Section: Introductionmentioning

confidence: 99%

Laser-Generation Based Imaging of Ultrasonic Wave Propagation on Welded Steel Plates and Its Application to Defect Detection

et al. 2010

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This study investigated nondestructive testing of welded steel plates by imaging ultrasonic wave propagation based on laser generation. The specimens were scanned by a pulsed laser, and the signals were received by a fixed piezoelectric transducer. A moving diagram of wave propagation from the fixed point was obtained directly from the collected signals. Wave scattering due to a weld defect (e.g., toe crack or root crack) was successfully imaged on weld specimens, and was easily recognized by visual observation in the measured moving diagrams. These experiments demonstrated the ability of the imaging technique to inspect a large area in a short time and to reliably detect a defect. Furthermore, the position-time-amplitude maps (B-scope images) were reconstructed from the moving diagram along some lines perpendicular to the defect, and the location and the size of a root crack were evaluated based on the B-scope images.

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Shear-wave time of flight diffraction (S-TOFD) technique

Cited by 58 publications

References 12 publications

A review of fatigue damage detection and measurement techniques

A review of fatigue damage detection and measurement techniques

Estimating ultrasonic time of flight using envelope and quasi maximum likelihood method for damage detection and assessment

Laser-Generation Based Imaging of Ultrasonic Wave Propagation on Welded Steel Plates and Its Application to Defect Detection

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