Analysis of high frequency guided wave scattering at a fastener hole with a view to fatigue crack detection

Masserey, Bernard; Fromme, Paul

doi:10.1016/j.ultras.2016.12.015

Cited by 37 publications

(23 citation statements)

References 29 publications

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“…In many applications of guided waves that were to detect and predict crack growth, the SHM configurations and flaw locations were fixed. Although the usefulness of guided waves was exemplified [6][7][8][9], the sensitivity of the response (detection) to the configuration was not explored. As a result of part geometry, it was not always possible to replicate the same configuration in real-world use.…”

Section: Numerical Modeling Of Shm Signalsmentioning

confidence: 99%

Uncertainty Evaluation in the Design of Structural Health Monitoring Systems for Damage Detection†

et al. 2018

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Abstract:The validation of structural health monitoring (SHM) systems for aircraft is complicated by the extent and number of factors that the SHM system must demonstrate for robust performance. Therefore, a time-and cost-efficient method for examining all of the sensitive factors must be conducted. In this paper, we demonstrate the utility of using the simulation modeling environment to determine the SHM sensitive factors that must be considered for subsequent experiments, in order to enable the SHM validation. We demonstrate this concept by examining the effect of SHM system configuration and flaw characteristics on the response of a signal from a known piezoelectric wafer active sensor (PWAS) in an aluminum plate, using simulation models of a particular hot spot. We derive the signal responses mathematically and through the statistical design of experiments, we determine the significant factors that affect the damage indices that are computed from the signal, using only half the number of runs that are normally required. We determine that the transmitter angle is the largest source of variation for the damage indices that are considered, followed by signal frequency and transmitter distance to the hot spot. These results demonstrate that the use of efficient statistical design and simulation may enable a cost-and time-efficient sequential approach to quantifying sensitive SHM factors and system validation.

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Section: Numerical Modeling Of Shm Signalsmentioning

confidence: 99%

Uncertainty Evaluation in the Design of Structural Health Monitoring Systems for Damage Detection†

et al. 2018

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“…Pulse‐echo guided wave testing mode permits inaccessible areas to be investigated to detect corrosion in pipe risers. Ultrasonic guided wave (UGW) is a low‐attenuation, rapid, and accurate nondestructive testing method. When defects occur in pipe risers, there are flaw echoes in the time domain.…”

Section: Introductionmentioning

confidence: 99%

Axial magnetized patch for efficient transduction of longitudinal guided wave and defect identification in concrete-covered pipe risers

Fang

Tse

2018

Struct Control Health Monit

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Pipe risers partially covered by a wall are difficult to test because the concrete causes large attenuation and mode conversion. Both reasons make it difficult to analyze the signal. This paper reports the design of an axial magnetized magnetostrictive patch transducer (AM-MPT) for efficient transduction of longitudinal guided wave, which can be used to detect defects in concrete-covered pipe risers. First, the paper started with a theoretical background about the influence of length-to-width ratio of the magnetized rectangular patch on the demagnetizing factors and the magnetic field intensity of the patch. Second, the simulation and experimental results proved that the length-to-width ratio of the magnetized iron cobalt patch has a great influence on its magnetic field intensity and signal amplitude of the AM-MPT. Comparison experiments proved that the static magnetic field of AM-MPT provided by an iron cobalt patch led to larger signal amplitudes than those provided by magnets. Third, the attenuation of L(0,2) in concrete-covered pipe riser were studied using the AM-MPT experimentally, which were according with disperse simulation results basically. And the experimental results proved that AM-MPT was more suitable to be applied in concrete-covered pipe risers testing than original MPT.Finally, the AM-MPT was applied in a defect identification of concrete-covered pipe riser sample. The experimental results for the AM-MPT and the piezoelectric transducer showed that the AM-MPT can potentially be applied in pipe riser defect identification.

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“…For a structural health monitoring approach using GUW, the detection and localization of defects has been demonstrated [6,7]. The detection of hidden damage [8,9] and fatigue cracks [10][11][12][13] using high frequency GUW has been investigated. Employing laser excitation and measurement of the fundamental Lamb wave modes, crack detection in silicon wafers was achieved [14].…”

Section: Introductionmentioning

confidence: 99%

Silicon wafer defect detection using high frequency guided waves

Lauper¹,

Fromme

Robyr³

et al. 2018

Health Monitoring of Structural and Biological Systems XII

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In the photovoltaic industry monocrystalline silicon wafers are employed for the manufacture of solar panels with high conversion efficiency. The cutting process induces micro-cracks on the thin wafer surface. High frequency guided ultrasonic waves are considered for the structural monitoring of the wafers and the nondestructive characterization of the micro-cracks. The material anisotropy of the monocrystalline silicon leads to variations of the wave characteristics depending on the propagation direction relative to the crystal orientation. In non-principal directions of the crystal, wave beam skewing occurs. Selective excitation of the fundamental Lamb wave modes was achieved using a custom-made angle beam transducer and holder to achieve a controlled contact pressure. The out-of-plane component of the guided wave propagation was measured using a noncontact laser interferometer. Artificial defects were introduced in the wafers using a micro indenter with varying loads. The defects were characterized from microscopy images to measure the indent size and combined crack length. The scattering of the A 0 Lamb wave mode was measured experimentally and the characteristics of the scattered wave field were correlated to the defect size. The detection sensitivity is discussed.

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Analysis of high frequency guided wave scattering at a fastener hole with a view to fatigue crack detection

Cited by 37 publications

References 29 publications

Uncertainty Evaluation in the Design of Structural Health Monitoring Systems for Damage Detection†

Uncertainty Evaluation in the Design of Structural Health Monitoring Systems for Damage Detection†

Axial magnetized patch for efficient transduction of longitudinal guided wave and defect identification in concrete-covered pipe risers

Silicon wafer defect detection using high frequency guided waves

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