Analysis of subharmonic resonance in ultrasonic testing of a closed crack based on gap-width-dependent property of interfacial stiffness

2011 ◽  
Author(s):  
Kurihara Kenji ◽  
Keiichi Naito ◽  
Toshihiko Sugiura
Keyword(s):  
Ultrasonic Testing ◽  
Subharmonic Resonance ◽  
Closed Crack ◽  
Interfacial Stiffness ◽  
Dependent Property ◽  
Gap Width

Ultrafast phased-array imaging with pump excitation for closed-crack imaging

2021 ◽  
Vol 14 (12) ◽  
pp. 126505
Author(s):  
Yoshikazu Ohara ◽  
Sylvain Haupert ◽  
Sinan Li
Keyword(s):  
Nondestructive Evaluation ◽  
Ultrasonic Testing ◽  
High Speed ◽  
Phased Array ◽  
Imaging Technique ◽  
Crack Opening ◽  
Closed Crack ◽  
Wave Imaging ◽  
Crack Dynamics ◽  
Array Imaging

Abstract Nondestructive evaluation of closed cracks is one of the most challenging problems in ultrasonic testing. Here, we propose a novel closed-crack imaging technique combining ultrafast phased-array with pump excitation. The pump excitation with kHz frequency can effectively induce the crack opening/closing behaviors since it can generate a large displacement of 1000 nm order. At the same time, ultrafast phased-array imaging, i.e. plane wave imaging, with MHz frequency stroboscopically captures the high-speed crack dynamics induced by pump excitation. We successfully proved the concept in a closed fatigue crack specimen.

Development of Ultrasonic Testing System of Rubber Roll for the Paper Manufacture

2005 ◽  
Vol 59 (9) ◽  
pp. 1293-1301
Author(s):  
Shigeki Watanabe ◽  
Mitsunao Ariji ◽  
Kazuo Kobayashi
Keyword(s):  
Ultrasonic Testing ◽  
Testing System
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