scholarly journals Highly-efficient and noncontact vibro-thermography via local defect resonance

2015 ◽  
Vol 12 (1) ◽  
pp. 98-111 ◽  
Author(s):  
Igor Solodov ◽  
Markus Rahammer ◽  
Daria Derusova ◽  
Gerd Busse
Keyword(s):  
Local Defect ◽  
Highly Efficient ◽  
Local Defect Resonance

Local defect resonance of a through-thickness crack

Ultrasonics ◽  
2022 ◽  
Vol 118 ◽  
pp. 106565
Author(s):  
I. Solodov ◽  
M. Kreutzbruck
Keyword(s):  
Local Defect ◽  
Local Defect Resonance

Towards in-plane local defect resonance for non-destructive testing of polymers and composites

2018 ◽  
Vol 98 ◽  
pp. 130-133 ◽  
Author(s):  
Joost Segers ◽  
Mathias Kersemans ◽  
Saeid Hedayatrasa ◽  
Javier Calderon ◽  
Wim Van Paepegem
Keyword(s):  
Local Defect ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Local Defect Resonance ◽  
Non Destructive

Measurement of Natural Vibrations and Resonant Second Higher-Harmonics Due to a Fatigue Crack

2020 ◽  
Vol 3 (4) ◽  
Author(s):  
Kosuke Kanda ◽  
Shan Lin
Keyword(s):  
Fatigue Crack ◽  
Frequency Response ◽  
Ultrasonic Testing ◽  
Characteristic Curve ◽  
Ultrasonic Waves ◽  
Local Defect ◽  
Response Characteristics ◽  
Local Defect Resonance ◽  
Nonlinear Ultrasonic ◽  
Frequency Response Characteristics

Abstract Nonlinear ultrasonic testing is considered a more promising technique for evaluating closed cracks than conventional ultrasonic testing. However, the mechanism of the generation of nonlinear ultrasonic waves has not been sufficiently explained. We first set up a system to measure the frequency–response characteristics of ultrasonic waves and experimentally investigated the mechanism of second higher-harmonic (HH) wave generation for a fatigue crack. Sweeping the frequencies of incident waves impinging on a fatigue crack introduced to a specimen, we obtained a frequency–response characteristic curve for the crack. From the curve, resonance phenomena resulting from local defect resonance were observed. We then measured the frequency response characteristics of second HH waves using the same system and consequently confirmed that second HH waves resonated when their frequencies corresponded to the eigenfrequencies of the crack. Finally, we theoretically showed that the resonant second HH waves were generated by local defect resonance and nonlinearity.

Far-sided defect recognition of FRP sandwich structures based on local defect resonance

2019 ◽  
pp. 109963621984025 ◽  
Author(s):  
Shufeng Zhang ◽  
Chao Ma ◽  
Haifeng Hu ◽  
Yu Jiang ◽  
Xun Chen ◽  
...  
Keyword(s):  
Sandwich Structures ◽  
Local Defect ◽  
Local Defect Resonance ◽  
Defect Recognition

scholarly journals Non-Destructive Testing of Composites by Ultrasound, Local Defect Resonance and Thermography

Proceedings ◽  
2018 ◽  
Vol 2 (8) ◽  
pp. 554 ◽  
Author(s):  
Mathias Kersemans ◽  
Erik Verboven ◽  
Joost Segers ◽  
Saeid Hedayatrasa ◽  
Wim Van Paepegem
Keyword(s):  
Impact Damage ◽  
A Priori ◽  
Back Surface ◽  
Local Defect ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Flat Bottom ◽  
Reinforced Plastics ◽  
Local Defect Resonance ◽  
Non Destructive

Different non-destructive testing techniques have been evaluated for detecting and assessing damage in carbon fiber reinforced plastics: (i) ultrasonic C-scan, (ii) local defect resonance of front/back surface and (iii) lock-in infrared thermography in reflection. Both artificial defects (flat bottom holes and inserts) and impact damage (barely visible impact damage) have been considered. The ultrasonic C-scans in reflection shows good performance in detecting the defects and in assessing actual defect parameters (e.g., size and depth), but it requires long scanning procedures and water coupling. The local defect resonance technique shows acceptable defect detectability, but has difficulty in extracting actual defect parameters without a priori knowledge. The thermographic inspection is by far the fastest technique, and shows good detectability of shallow defects (depth < 2 mm). Lateral sizing of shallow damage is also possible. The inspection of deeper defects (depth > 3–4 mm) in reflection is problematic and requires advanced post-processing approaches in order to improve the defect contrast to detectable limits.

scholarly journals Backside delamination detection in composites through local defect resonance induced nonlinear source behavior

2020 ◽  
Vol 479 ◽  
pp. 115360 ◽  
Author(s):  
Joost Segers ◽  
Saeid Hedayatrasa ◽  
Gaétan Poelman ◽  
Wim Van Paepegem ◽  
Mathias Kersemans
Keyword(s):  
Local Defect ◽  
Nonlinear Source ◽  
Delamination Detection ◽  
Local Defect Resonance
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