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This study evaluated fatigue-induced disbond areas in CFRP double-lap joints by using embedded fiber Bragg grating (FBG) sensors. When the disbond grew by cyclic loading, the embedded FBG sensors yiel...ded reflection spectra having two peaks representing a step-like strain distribution generated by the disbond; the peak at the shorter wavelength corresponded to the unloaded disbond region. The ratio of the peak intensity at the shorter wavelength to that at the longer wavelength increased gradually with increasing disbond length. The relationship between the peak intensity ratio and the disbond length was analyzed by coupled structural-optical analysis and was validated by comparing analytical peak intensity ratio with experiment results. The disbond length was then estimated from the measured spectra based on this analytical calibration relationship, but the estimated disbond area exceeded that observed using the ultrasonic C-scan technique. Additional experiments including destructive observation of the adhesive suggested that an embedded FBG sensor could detect a moving disbond tip earlier than conventional nondestructive techniques.続きを見る
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Mendeley出力
