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Probing the limits of full-field linear local defect resonance identification for deep defect detection

Joost Segers (UGent) , Saeid Hedayatrasa (UGent) , Gaétan Poelman (UGent) , Wim Van Paepegem (UGent) and Mathias Kersemans (UGent)
(2020) ULTRASONICS. 105.
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Abstract
Local Defect Resonance (LDR) is exploited for non-destructive testing (NDT) by using ultrasonic vibrations to get a localized resonant activation of defected zones. The LDR technique relies on the local stiffness difference between the defect and the sound material. Analyzing the structure’s displacement field at this localized resonance frequency reveals the defect’s location and provides information about the defect’s characteristics, i.e. geometry, size and depth. In this study, the opportunities and limitations of linear LDR for NDT of materials are investigated in a parametric way. Both finite element simulations and experiments (using scanning laser Doppler vibrometry) are performed for aluminum alloy and carbon fiber reinforced polymer coupons with flat bottom holes and delaminations ranging in both depth and diameter. The resonance frequencies as well as the associated defect-to-background ratios are parametrically evaluated. For shallow defects, a clear LDR is observed caused by the strong local stiffness reduction at the defect. On the contrary, deep defects are associated with a limited stiffness decrease that results in the absence of LDR behavior. The local stiffness reduction at damages is further exploited using a weighted band power calculation. It is shown that using this technique, deep defects can be detected for which no LDR behavior was observed.
Keywords
Composites, NDT, Local defect resonance, laser Doppler vibrometry, weighted band power, IMPACT DAMAGE, ACOUSTIC NONLINEARITY, COMPOSITE PANEL, FREQUENCIES

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MLA
Segers, Joost, et al. “Probing the Limits of Full-Field Linear Local Defect Resonance Identification for Deep Defect Detection.” ULTRASONICS, vol. 105, 2020, doi:10.1016/j.ultras.2020.106130.
APA
Segers, J., Hedayatrasa, S., Poelman, G., Van Paepegem, W., & Kersemans, M. (2020). Probing the limits of full-field linear local defect resonance identification for deep defect detection. ULTRASONICS, 105. https://doi.org/10.1016/j.ultras.2020.106130
Chicago author-date
Segers, Joost, Saeid Hedayatrasa, Gaétan Poelman, Wim Van Paepegem, and Mathias Kersemans. 2020. “Probing the Limits of Full-Field Linear Local Defect Resonance Identification for Deep Defect Detection.” ULTRASONICS 105. https://doi.org/10.1016/j.ultras.2020.106130.
Chicago author-date (all authors)
Segers, Joost, Saeid Hedayatrasa, Gaétan Poelman, Wim Van Paepegem, and Mathias Kersemans. 2020. “Probing the Limits of Full-Field Linear Local Defect Resonance Identification for Deep Defect Detection.” ULTRASONICS 105. doi:10.1016/j.ultras.2020.106130.
Vancouver
1.
Segers J, Hedayatrasa S, Poelman G, Van Paepegem W, Kersemans M. Probing the limits of full-field linear local defect resonance identification for deep defect detection. ULTRASONICS. 2020;105.
IEEE
[1]
J. Segers, S. Hedayatrasa, G. Poelman, W. Van Paepegem, and M. Kersemans, “Probing the limits of full-field linear local defect resonance identification for deep defect detection,” ULTRASONICS, vol. 105, 2020.
@article{8654825,
  abstract     = {{Local Defect Resonance (LDR) is exploited for non-destructive testing (NDT) by using ultrasonic
vibrations to get a localized resonant activation of defected zones. The LDR technique relies on the
local stiffness difference between the defect and the sound material. Analyzing the structure’s
displacement field at this localized resonance frequency reveals the defect’s location and provides
information about the defect’s characteristics, i.e. geometry, size and depth.
In this study, the opportunities and limitations of linear LDR for NDT of materials are investigated in a
parametric way. Both finite element simulations and experiments (using scanning laser Doppler
vibrometry) are performed for aluminum alloy and carbon fiber reinforced polymer coupons with flat
bottom holes and delaminations ranging in both depth and diameter. The resonance frequencies as
well as the associated defect-to-background ratios are parametrically evaluated.
For shallow defects, a clear LDR is observed caused by the strong local stiffness reduction at the defect.
On the contrary, deep defects are associated with a limited stiffness decrease that results in the
absence of LDR behavior.
The local stiffness reduction at damages is further exploited using a weighted band power calculation.
It is shown that using this technique, deep defects can be detected for which no LDR behavior was
observed.}},
  articleno    = {{106130}},
  author       = {{Segers, Joost and Hedayatrasa, Saeid and Poelman, Gaétan and Van Paepegem, Wim and Kersemans, Mathias}},
  issn         = {{0041-624X}},
  journal      = {{ULTRASONICS}},
  keywords     = {{Composites,NDT,Local defect resonance,laser Doppler vibrometry,weighted band power,IMPACT DAMAGE,ACOUSTIC NONLINEARITY,COMPOSITE PANEL,FREQUENCIES}},
  language     = {{eng}},
  pages        = {{9}},
  title        = {{Probing the limits of full-field linear local defect resonance identification for deep defect detection}},
  url          = {{http://dx.doi.org/10.1016/j.ultras.2020.106130}},
  volume       = {{105}},
  year         = {{2020}},
}

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