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Proceedings Paper

Lamb wave based detection of damage in a stiffener bonded to a plate
Author(s): G. Kolappan Geetha; V. T. Rathod; D. Roy Mahapatra; S. Gopalakrishnan
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Paper Abstract

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.

Paper Details

Date Published: 18 April 2011
PDF: 8 pages
Proc. SPIE 7984, Health Monitoring of Structural and Biological Systems 2011, 79842X (18 April 2011); doi: 10.1117/12.881097
Show Author Affiliations
G. Kolappan Geetha, Indian Institute of Science (India)
V. T. Rathod, Indian Institute of Science (India)
D. Roy Mahapatra, Indian Institute of Science (India)
S. Gopalakrishnan, Indian Institute of Science (India)

Published in SPIE Proceedings Vol. 7984:
Health Monitoring of Structural and Biological Systems 2011
Tribikram Kundu, Editor(s)

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