Damage Detection of CFRP Stiffened Panels by Using Cross-Correlated Spatially Shifted Distributed Strain Sensors

Applied Sciences

Fulvio Romano¹  Bernardino Galasso¹  Antonio Concilio¹  Monica Ciminello¹  NatalinoDaniele Boffa²  Ernesto Monaco² 

[1] CIRA, Italian Aerospace Research Center, 81043 Capua, Italy;Department of Industrial Engineering—Aerospace Division, University of Naples Federico II, Via Claudio, 21, 80125 Napoli, Italy;

关键词: structural damage;    non-model-based method;    distributed fiber optic sensors;    cross-correlation;   

DOI  :  10.3390/app10082662

来源: DOAJ

【 摘 要 】

This paper presents a cross-correlation function-based method applied to a spatially shifted differential strain readout vectors using distributed sensors under backscattering random noise and impact excitations. Structural damage is generated by low/medium energy impact on two aeronautical 24-ply CFRP (carbon fiber reinforced plastic) stiffened panels. Two different drop impact locations, two different sensor layouts and two different post-impact solicitations are provided for a skin-stringer debonding detection and length estimation. The differential signal with respect to an arbitrarily selected grounding is used. Then the effects of noise filtering are evaluated post-processing the differential signal by cross-correlating two strain vectors having one sensor gauge position lag. A Rayleigh backscattering sensing technology, with 5 mm of spatial resolution, is used to log the strain map. The results show a good coherence with respect to the NDI (nondestructive inspection) performed by ultrasonic C-scan (an ultrasonic imaging system) flaw detector.

【 授权许可】

Unknown