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. Pulsed-phase thermography indicates a progression in defect size at the adhesive layer that strongly suggests non-uniform loading of the FBG sensor. These imaging results are applied to finite element modeling of the joint to simulate the non-linearities in the structural response.
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Acknowledgements
The authors would like to thank the National Science Foundation (CMMI 0900369) for their support of this work.
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© 2014 The Society for Experimental Mechanics
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Webb, S.C., Shin, P., Peters, K. (2014). Fusion of Global and Local Measurements of Damage in Bonded Joints. In: Jay, C. (eds) Fracture and Fatigue, Volume 7. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-00765-6_3
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DOI: https://doi.org/10.1007/978-3-319-00765-6_3
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