Analyzing the nonlinear mechanisms in active wave modulation spectroscopy and their Influence on delamination detection in laminated strips and plates

2019 ◽  
Author(s):  
Christoforos Rekatsinas ◽  
Nikolaos Chrysochoidis ◽  
Dimitris Saravanos
Keyword(s):  
Modulation Spectroscopy ◽  
Wave Modulation ◽  
Delamination Detection ◽  
Active Wave

Detection of structural damage of aluminum alloy 6082 using elastic wave modulation spectroscopy

2008 ◽  
Vol 41 (7) ◽  
pp. 554-563 ◽  
Author(s):  
Ladislav Straka ◽  
Yuriy Yagodzinskyy ◽  
Michal Landa ◽  
Hannu Hänninen
Keyword(s):  
Aluminum Alloy ◽  
Elastic Wave ◽  
Structural Damage ◽  
Modulation Spectroscopy ◽  
Wave Modulation

Delamination detection in composites using wave modulation spectroscopy with a novel active nonlinear acousto-ultrasonic piezoelectric sensor

2011 ◽  
Vol 22 (18) ◽  
pp. 2193-2206 ◽  
Author(s):  
Nikolaos A. Chrysochoidis ◽  
Antigoni K. Barouni ◽  
Dimitris A. Saravanos
Keyword(s):  
High Frequency ◽  
Low Cost ◽  
Piezoelectric Sensor ◽  
Crack Size ◽  
Basic Element ◽  
High Frequency Signal ◽  
Modulation Spectroscopy ◽  
Wave Modulation ◽  
Active Sensor ◽  
Delamination Cracks

A novel structural health monitoring (SHM) methodology, based on nonlinear wave modulation spectroscopy, is presented for the detection of delamination cracks in composites. The basic element is a novel active nonlinear acousto-ultrasonic piezoelectric sensor enabling low-cost and wide-frequency operational bandwidth. The active sensor configuration involves two piezoceramic wafer actuators, each one excited with a low- and high-frequency signal respectively, and a piezoceramic sensor, all permanently bonded on the tested structure. Experiments are conducted on two sets of composite strips containing delamination cracks of different sizes. Measured results illustrate first the efficiency of the nonlinear ultrasonics methodology to detect delamination cracks, as well as, the potential and benefits of the new active sensor. The sensitivity of the active sensor response to the crack size and the applied high-frequency carrier signals at the actuators, vary at various frequency and voltage levels indicating the appropriate testing setup. Additionally repeatability of proposed SHM methodology is studied.

Noncontact detection of fatigue cracks by laser nonlinear wave modulation spectroscopy (LNWMS)

2014 ◽  
Vol 66 ◽  
pp. 106-116 ◽  
Author(s):  
Peipei Liu ◽  
Hoon Sohn ◽  
Tribikram Kundu ◽  
Suyoung Yang
Keyword(s):  
Nonlinear Wave ◽  
Fatigue Cracks ◽  
Modulation Spectroscopy ◽  
Wave Modulation
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