Identifying delaminations at the early stage is crucial to ensure the integrity and safety of carbon fiber reinforced polymer (CFRP) laminated plates. To precisely localize incipient delaminations relying on mode shapes, very small spatial sampling intervals matching the size of a delamination are required; however, noise components inevitably involved in densely-sampled mode shapes can cause intense noise interference, masking actual delamination-caused changes. Under this situation, developing noise-robust methods for identifying incipient small-sized delaminations in CFRP laminated plates is one of the current research interests. To this end, a noise-robust damage index is formulated in this study for damage identification in plates under noisy environments. The damage index relies on the 2D multiresolution modal Teager-Kaiser energy of measured and reconstructed mode shapes. The capability of the damage index for identifying incipient delamination is experimentally validated on a CFRP laminated plate with an incipient delamination, whose mode shapes are acquired via the non-contact measurement using a scanning laser vibrometer. The experimental result show that the damage index can effectively designate the presence and location of the incipient delamination in the CFRP laminated plate under noisy environments.
W. Xu, M. S. Cao, M. Radzieński, and W. Ostachowicz, "A damage index for identifying incipient delamination in CFRP laminated plates relying on 2D multi-resolution modal Teager-Kaiser energy
," Proc. SPIE 10600, Health Monitoring of Structural and Biological Systems XII, 106001M (Presented at SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring: March 07, 2018; Published: 27 March 2018); https://doi.org/10.1117/12.2295189.
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