Noncontact Nonlinear Ultrasonic Wave Modulation for Fatigue Crack and Delamination Detection

2018 ◽  
pp. 661-697
Author(s):  
Hoon Sohn ◽  
Peipei Liu ◽  
Hyung Jin Lim ◽  
Byeongjin Park
Keyword(s):  
Fatigue Crack ◽  
Ultrasonic Wave ◽  
Wave Modulation ◽  
Delamination Detection ◽  
Nonlinear Ultrasonic

Nonlinear ultrasonic wave modulation for online fatigue crack detection

2014 ◽  
Vol 333 (5) ◽  
pp. 1473-1484 ◽  
Author(s):  
Hoon Sohn ◽  
Hyung Jin Lim ◽  
Martin P. DeSimio ◽  
Kevin Brown ◽  
Mark Derriso
Keyword(s):  
Fatigue Crack ◽  
Ultrasonic Wave ◽  
Crack Detection ◽  
Wave Modulation ◽  
Nonlinear Ultrasonic ◽  
Fatigue Crack Detection

Non-contact visualization of nonlinear ultrasonic modulation for reference-free fatigue crack detection

2014 ◽  
Author(s):  
Hyung Jin Lim ◽  
Byeongju Song ◽  
Byeongjin Park ◽  
Peipei Liu ◽  
Hoon Sohn
Keyword(s):  
Fatigue Crack ◽  
Crack Detection ◽  
Nonlinear Ultrasonic ◽  
Fatigue Crack Detection ◽  
Contact Visualization

Application of an Optical Fiber Sensor for Nonlinear Ultrasonic Evaluation of Fatigue Crack

2019 ◽  
Vol 19 (13) ◽  
pp. 4992-4999 ◽  
Author(s):  
Qi Wu ◽  
Rong Wang ◽  
FengMing Yu ◽  
Yoji Okabe
Keyword(s):  
Fatigue Crack ◽  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Ultrasonic Evaluation ◽  
Nonlinear Ultrasonic

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.

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