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Lamb‐wave‐based structural health monitoring technique for inaccessible regions in complex composite structures
This work investigated feasibility of Lamb wave based SHM technique for in‐situ monitoring of hidden (inaccessible) web region, for delamination type of defect, in a typical stiffened composite (I‐joint) section of an aircraft structure. Finite element model was proposed to understand and compare the wave propagation of fundamental symmetric Lamb mode (S0) through a healthy and center delaminated web of the I‐joint. In simulations, S0 mode was excited at the center of web, which then, travels along the web and propagates into skin regions of the I‐joint. Turning modes were also observed. From the S0 mode captured at two locations on the skin, one for the direct mode and another for the turning mode, it was seen that amplitude of the captured mode can used as a feature for delamination detection. Experiments were carried out on the I‐joint with bonded piezoelectric wafer active sensor patch on the web and skin regions. In order to reduce the weight of the SHM instrumentation, an attempt was made to develop a low footprint, portable instrumentation for actuation, and reception of Lamb waves and wireless live transmission of the ultrasonic data. Experimental measurements showed a similar trend of significant decrease in the amplitude of S0 modes when propagating through the web delamination when compared to simulation. Copyright © 2013 John Wiley & Sons, Ltd.
Lamb‐wave‐based structural health monitoring technique for inaccessible regions in complex composite structures
This work investigated feasibility of Lamb wave based SHM technique for in‐situ monitoring of hidden (inaccessible) web region, for delamination type of defect, in a typical stiffened composite (I‐joint) section of an aircraft structure. Finite element model was proposed to understand and compare the wave propagation of fundamental symmetric Lamb mode (S0) through a healthy and center delaminated web of the I‐joint. In simulations, S0 mode was excited at the center of web, which then, travels along the web and propagates into skin regions of the I‐joint. Turning modes were also observed. From the S0 mode captured at two locations on the skin, one for the direct mode and another for the turning mode, it was seen that amplitude of the captured mode can used as a feature for delamination detection. Experiments were carried out on the I‐joint with bonded piezoelectric wafer active sensor patch on the web and skin regions. In order to reduce the weight of the SHM instrumentation, an attempt was made to develop a low footprint, portable instrumentation for actuation, and reception of Lamb waves and wireless live transmission of the ultrasonic data. Experimental measurements showed a similar trend of significant decrease in the amplitude of S0 modes when propagating through the web delamination when compared to simulation. Copyright © 2013 John Wiley & Sons, Ltd.
Lamb‐wave‐based structural health monitoring technique for inaccessible regions in complex composite structures
M., Janardhan Padiyar (author) / Balasubramaniam, Krishnan (author)
Structural Control and Health Monitoring ; 21 ; 817-832
2014-05-01
16 pages
Article (Journal)
Electronic Resource
English
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