Characterization of fatigue damage in adhesively bonded lap joints through dynamic, full-spectral interrogation of fiber Bragg grating sensors

S. Webb; P. Shin; K. Peters; M. A. Zikry; S. Chadderdon; N. Stan; R. Selfridge; S. Schultz

doi:10.1117/12.2010018

11 April 2013 Characterization of fatigue damage in adhesively bonded lap joints through dynamic, full-spectral interrogation of fiber Bragg grating sensors

S. Webb, P. Shin, K. Peters, M. A. Zikry, S. Chadderdon, N. Stan, R. Selfridge, S. Schultz

Author Affiliations +

Proceedings Volume 8693, Smart Sensor Phenomena, Technology, Networks, and Systems Integration 2013; 86930H (2013) https://doi.org/10.1117/12.2010018
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2013, San Diego, California, United States

Abstract

In this study we evaluate the measurements of a fiber Bragg grating (FBG) sensor embedded at the adhesive layer of a single composite lap joint subjected to harmonic excitation after fatigue loading. After a fully-reversed cyclic fatigue loading is applied to the composite lap joint, the full spectral response of the sensor is interrogated in reflection at 100 kHz during two states: with and without an added harmonic excitation. The dynamic response of the FBG sensor indicates strong nonlinearities as damage progresses. The short-time Fourier transform (STFT) is computed for the extracted peak wavelength information to reveal time-dependent frequencies and amplitudes of the dynamic FBG sensor response. Pulse-phase thermography indicates a progression in defect size at the adhesive layer that strongly suggests non-uniform loading of the FBG sensor.

Citation Download Citation

S. Webb, P. Shin, K. Peters, M. A. Zikry, S. Chadderdon, N. Stan, R. Selfridge, and S. Schultz "Characterization of fatigue damage in adhesively bonded lap joints through dynamic, full-spectral interrogation of fiber Bragg grating sensors", Proc. SPIE 8693, Smart Sensor Phenomena, Technology, Networks, and Systems Integration 2013, 86930H (11 April 2013); https://doi.org/10.1117/12.2010018

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