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Lamb wave based detection of damage in a stiffener bonded to a plate

Geetha, Kolappan G and Rathod, MT and Mahapatra, Roy D and Gopalakrishnan, S (2012) Lamb wave based detection of damage in a stiffener bonded to a plate. In: SPIE Smart Structures/NDE Conference, March 06, 2012, San Diego, California, USA.

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Official URL: http://dx.doi.org/10.1117/12.881097


Stiffener is one of the major components of aircraft structures to increase the load carrying capacity. Damage in the stiffener, mostly in the form of crack is an unavoidable problem in aerospace structures. Stiffener is bonded to the inner side of the aircraft panel which is not accessible for immediate inspection. A sensor-actuator network can be placed on the outer side of the panel that is accessible. Ultrasonic lamb waves are transmitted through stiffener using the sensoractuator network for detecting the presence of damages. The sensor-actuator network is placed on both halves of the stiffened section on the accessible surface of the plate. Detecting damage in stiffener by using this technique has significant potential for SHM technology. One of the major objectives of the present work is to determine the smallest detectable crack on the stiffener using the proposed technique. Wavelet based damage parameter correlation studies are carried out. In the proposed scheme, with increase in the damage size along the stiffener, it is found that the amplitude of the received signal decreases monotonically. The advantage of this technique is that the stiffened panels need not be disassembled in a realistic deployment of SHM system.

Item Type: Conference Paper
Publisher: SPIE-International Society for Optical Engineering
Additional Information: Copyright of this article belongs to SPIE-International Society for Optical Engineering.
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 10 Feb 2014 10:25
Last Modified: 10 Feb 2014 10:25
URI: http://eprints.iisc.ac.in/id/eprint/48398

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