Ultrasonic guided wave characterization and damage detection in foam-core sandwich panel using PWAS and LDV

Nibir Chakraborty; D. Roy Mahapatra; Gopalakrishnan Srinivasan

doi:10.1117/12.917598

20 April 2012 Ultrasonic guided wave characterization and damage detection in foam-core sandwich panel using PWAS and LDV

Nibir Chakraborty, D. Roy Mahapatra, Gopalakrishnan Srinivasan

Author Affiliations +

Proceedings Volume 8348, Health Monitoring of Structural and Biological Systems 2012; 83481O (2012) https://doi.org/10.1117/12.917598
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2012, San Diego, California, United States

Abstract

Lamb wave type guided wave propagation in foam core sandwich structures and detectability of damages using spectral analysis method are reported in this paper. An experimental study supported by theoretical evaluation of the guided wave characteristics is presented here that shows the applicability of Lamb wave type guided ultrasonic wave for detection of damage in foam core sandwich structures. Sandwich beam specimens were fabricated with 10 mm thick foam core and 0.3 mm thick aluminum face sheets. Thin piezoelectric patch actuators and sensors are used to excite and sense guided wave. Group velocity dispersion curves and frequency response of sensed signal are obtained experimentally. The nature of damping present in the sandwich panel is monitored by measuring the sensor signal amplitude at various different distances measured from the center of the linear phased array. Delaminations of increasing width are created and detected experimentally by pitch-catch interrogation with guided waves and wavelet transform of the sensed signal. Signal amplitudes are analyzed for various different sizes of damages to differentiate the damage size/severity. A sandwich panel is also fabricated with a planer dimension of 600 mm x 400 mm. Release film delamination is introduced during fabrication. Non-contact Laser Doppler Vibrometer (LDV) is used to scan the panel while exciting with a surface bonded piezoelectric actuator. Presence of damage is confirmed by the reflected wave fringe pattern obtained from the LDV scan. With this approach it is possible to locate and monitor the damages by tracking the wave packets scattered from the damages.

Citation Download Citation

Nibir Chakraborty, D. Roy Mahapatra, and Gopalakrishnan Srinivasan "Ultrasonic guided wave characterization and damage detection in foam-core sandwich panel using PWAS and LDV", Proc. SPIE 8348, Health Monitoring of Structural and Biological Systems 2012, 83481O (20 April 2012); https://doi.org/10.1117/12.917598

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