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Enhanced detectability of barely visible impact damage in CFRPs : vibrothermography of in-plane local defect resonances

Saeid Hedayatrasa (UGent) , Joost Segers (UGent) , Gaétan Poelman (UGent) , Wim Van Paepegem (UGent) and Mathias Kersemans (UGent)
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Abstract
This paper demonstrates the enhanced detectability of barely visible impact damage in CFRPs through low power vibrothermography of in-plane local defect resonances (LDR). In-plane LDR (LDRxy), with a higher cut-off frequency than out-of-plane LDR (LDRz), generally enhances the rubbing interaction and viscoelastic damping of defects and leads to higher vibration-induced heating. The most prominent LDRz and LDRxy frequencies of an impacted CFRP are extracted from its vibrational spectra under a broadband sweep excitation, measured by a 3D infrared laser Doppler vibrometer. The sample is then inspected through lock-in vibrothermography at the extracted LDR frequencies and the distintively higher detectability of LDRxy compared to LDRz is evidenced. Moreover, it is observed that the thermal contrast induced by LDRxy is so high, that it allows for easy detection of impact damage by live monitoring of infrared thermal images during a single broadband sweep vibration excitation.
Keywords
Vibrothermography, In-plane, Local defect resonance (LDR), Composites, Impact

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MLA
Hedayatrasa, Saeid et al. “Enhanced Detectability of Barely Visible Impact Damage in CFRPs : Vibrothermography of In-plane Local Defect Resonances.” MBL-Optimess 2019, Abstracts. 2019. Print.
APA
Hedayatrasa, S., Segers, J., Poelman, G., Van Paepegem, W., & Kersemans, M. (2019). Enhanced detectability of barely visible impact damage in CFRPs : vibrothermography of in-plane local defect resonances. MBL-Optimess 2019, Abstracts. Presented at the Measuring By Light meets Optical Measurement Techniques for Systems and Structures 2019.
Chicago author-date
Hedayatrasa, Saeid, Joost Segers, Gaétan Poelman, Wim Van Paepegem, and Mathias Kersemans. 2019. “Enhanced Detectability of Barely Visible Impact Damage in CFRPs : Vibrothermography of In-plane Local Defect Resonances.” In MBL-Optimess 2019, Abstracts.
Chicago author-date (all authors)
Hedayatrasa, Saeid, Joost Segers, Gaétan Poelman, Wim Van Paepegem, and Mathias Kersemans. 2019. “Enhanced Detectability of Barely Visible Impact Damage in CFRPs : Vibrothermography of In-plane Local Defect Resonances.” In MBL-Optimess 2019, Abstracts.
Vancouver
1.
Hedayatrasa S, Segers J, Poelman G, Van Paepegem W, Kersemans M. Enhanced detectability of barely visible impact damage in CFRPs : vibrothermography of in-plane local defect resonances. MBL-Optimess 2019, Abstracts. 2019.
IEEE
[1]
S. Hedayatrasa, J. Segers, G. Poelman, W. Van Paepegem, and M. Kersemans, “Enhanced detectability of barely visible impact damage in CFRPs : vibrothermography of in-plane local defect resonances,” in MBL-Optimess 2019, Abstracts, Antwerpen, Belgium, 2019.
@inproceedings{8622586,
  abstract     = {This paper demonstrates the enhanced detectability of barely visible impact damage in CFRPs through low power vibrothermography of in-plane local defect resonances (LDR). In-plane LDR (LDRxy), with a higher cut-off frequency than out-of-plane LDR (LDRz), generally enhances the rubbing interaction and viscoelastic damping of defects and leads to higher vibration-induced heating. The most prominent LDRz and LDRxy frequencies of an impacted CFRP are extracted from its vibrational spectra under a broadband sweep excitation, measured by a 3D infrared laser Doppler vibrometer.  The sample is then inspected through lock-in vibrothermography at the extracted LDR frequencies and the distintively higher detectability of LDRxy compared to LDRz is evidenced. Moreover, it is observed that the thermal contrast induced by LDRxy is so high, that it allows for easy detection of impact damage by live monitoring of infrared thermal images during a single broadband sweep vibration excitation.},
  author       = {Hedayatrasa, Saeid and Segers, Joost and Poelman, Gaétan and Van Paepegem, Wim and Kersemans, Mathias},
  booktitle    = {MBL-Optimess 2019, Abstracts},
  keywords     = {Vibrothermography,In-plane,Local defect resonance (LDR),Composites,Impact},
  language     = {eng},
  location     = {Antwerpen, Belgium},
  pages        = {1},
  title        = {Enhanced detectability of barely visible impact damage in CFRPs : vibrothermography of in-plane local defect resonances},
  year         = {2019},
}