Vibro-acoustic modulation based measurements in CFRP laminates for damage detection in Open-Hole structures

Journal
Composites communications  
Volume
42
Article Number
101659
Citation
Composites Communications 42: 101659 (2023-10)
Publisher DOI
10.1016/j.coco.2023.101659
Scopus ID
2-s2.0-85164379912
The occurrence of matrix cracks, fibre failures and delaminations results in a critical degradation of the structural integrity of composites. A reliable early detection of these damages is mandatory for a safe operation. In this paper, the application of Vibro-Acoustic Modulation measurement in notched carbon fibre reinforced polymers (CFRP) for damage detection is demonstrated. A piezoceramic actuator introduces an ultrasonic signal into the specimen, which is modulated by a low-frequency vibration excited by a servo-hydraulic testing system. The specimens tested are open hole tensile specimens according to ASTM D5766, made from a quasi-isotropic CFRP layup. Degradation in the form of matrix cracks or delaminations localised along the drill hole significantly reduces the stiffness and can be detected as a modulation increase. Taking into account the extent of the crack size and the acoustic emission (AE), a magnitude estimate of the modulation increase is possible. In consequence, the presented method can be used for damage monitoring in CFRP.
Subjects
Carbon fibre
Composite laminates
Damage progression
Health monitoring
Non-destructive testing
SHM
Vibro-acoustic modulation