Structural vibration-based damage classification of delaminated smart composite laminates

Asif Khan; Heung Soo Kim; Jung Woo Sohn

doi:10.1117/12.2292011

15 March 2018 Structural vibration-based damage classification of delaminated smart composite laminates

Asif Khan, Heung Soo Kim, Jung Woo Sohn

Proceedings Volume 10595, Active and Passive Smart Structures and Integrated Systems XII; 1059534 (2018) https://doi.org/10.1117/12.2292011
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2018, Denver, Colorado, United States

Abstract

Separation along the interfaces of layers (delamination) is a principal mode of failure in laminated composites and its detection is of prime importance for structural integrity of composite materials. In this work, structural vibration response is employed to detect and classify delaminations in piezo-bonded laminated composites. Improved layerwise theory and finite element method are adopted to develop the electromechanically coupled governing equation of a smart composite laminate with and without delaminations. Transient responses of the healthy and damaged structures are obtained through a surface bonded piezoelectric sensor by solving the governing equation in the time domain. Wavelet packet transform (WPT) and linear discriminant analysis (LDA) are employed to extract discriminative features from the structural vibration response of the healthy and delaminated structures. Dendrogram-based support vector machine (DSVM) is used to classify the discriminative features. The confusion matrix of the classification algorithm provided physically consistent results.

Citation Download Citation

Asif Khan, Heung Soo Kim, and Jung Woo Sohn "Structural vibration-based damage classification of delaminated smart composite laminates ", Proc. SPIE 10595, Active and Passive Smart Structures and Integrated Systems XII, 1059534 (15 March 2018); https://doi.org/10.1117/12.2292011

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