scholarly journals A local defect resonance for linear and nonlinear ultrasonic thermography

2012 ◽  
Author(s):  
I. Salodov ◽  
M. Rahammer ◽  
G. Busse
Keyword(s):  
Local Defect ◽  
Local Defect Resonance ◽  
Nonlinear Ultrasonic ◽  
Linear And Nonlinear ◽  
Ultrasonic Thermography

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.

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

Linear and Nonlinear Analysis of Additively Manufactured Material With Different Porosity Induced by Varying Material Printing Speed Using Guided Acoustic Waves

2021 ◽  
Author(s):  
SeHyuk Park ◽  
Hamad Alnuaimi ◽  
Anna Hayes ◽  
Madison Sitkiewicz ◽  
Umar Amjad ◽  
...  
Keyword(s):  
Acoustic Wave ◽  
Nonlinear Analysis ◽  
Lead Zirconate Titanate ◽  
Acoustic Waves ◽  
Scanning Speed ◽  
Lead Zirconate ◽  
Nonlinear Ultrasonic ◽  
Scan Speed ◽  
Linear And Nonlinear ◽  
Characterization Of Materials

Abstract Guided acoustic wave based techniques have been found to be very effective for damage detection, and both quantitative and qualitative characterization of materials. In this research, guided acoustic wave techniques are used for porosity evaluation of additively manufactured materials. A metal 3D printer, Concept Laser Mlab 200 R Cusing™, is used to manufacture 316L additively manufactured (AM) stainless steel specimens. Two levels of porosity are investigated in this study, which was controlled by a suitable combination of scan speed and laser power. The sample with lower level of porosity is obtained with a low scanning speed. Lead Zirconate Titanate (PZT) transducers are used to generate guided acoustic waves. The signal is excited and propagated through the specimens in a single sided transmission mode setup. Signal processing of the recorded signals for damage analysis involves both linear and nonlinear analyses. Linear ultrasonic parameters such as the time-of-flight and magnitude of the propagating waves are recorded. The nonlinear ultrasonic parameter, the Sideband Peak Count Index (SPC-I) is obtained by a newly developed nonlinear analysis technique. Results obtained for both specimens are analyzed and compared using both linear and nonlinear ultrasonic techniques. Finally, the effectiveness of SPC-I technique in monitoring porosity levels in AM specimens is discussed.

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

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

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
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