Abstract:This paper presents a robust assessment of debond in a glass fibre-reinforced polymer composite structure with L-stiffener attachment. Towards this, the ultrasonic guided wave (GW) propagation based laboratory experiments have been carried out on a stiffened composite panel with piezoelectric transducers for the excitation of GWs and a scanning laser Doppler vibrometer for sensing the GW propagation. To study the changes caused by the stiffener and debond a signal processing based multi-point analysis has been… Show more
“…The Hilbert envelope of the guided wave signals received at different receiver positions are presented in Figure 8 . The envelope of the guided wave signal obtained using Hilbert transform, H ( t ), can be expressed using the following equation [ 29 , 30 , 31 , 32 , 33 ]: …”
Section: Resultsmentioning
confidence: 99%
“…State-of-the-art reviews in the field of structural damage detection and localization using wavelet-based studies were conducted by several authors [ 26 , 27 , 28 , 29 , 30 ]. The detection and localization of wave-based impact damage in composite plates using CWT by analyzing the displacement of the mode shape is presented by Janeliukstis [ 14 ], and the wavelet coefficients were investigated by Fan [ 15 ].…”
Multilayered carbon fiber-reinforced polymers (CFRP) are increasingly used in aircraft components because of their superior mechanical properties. However, composite materials are vulnerable to impact loads, resulting in delamination-type damage which, if unnoticed, could lead to catastrophic structural failure. The objective of this research was to investigate possibilities to improve damage detection and the localization using signal processing methods. Numerical modeling using the semi-analytical finite element (SAFE) method was performed to obtain guided wave dispersion curves and to perform modal analysis. From the modal analysis, mode for inspection of the composite with delamination type defects was selected. From the numerical simulation, mode interaction with delamination along the longitudinal direction was analyzed and the location of the defect was estimated by measuring the time of flight (ToF) of the signal using Hilbert transform (HT) and continuous wavelet transform (CWT). The CWT has shown better results in estimating the delamination location compared with HT. The depth of delamination was characterized in the frequency domain by comparing the amplitude of the mode. Inverse fast Fourier transform (IFFT) is recommended to reconstruct the reflected and transmitted modes for better damage detection and to reduce the complexity of signal interpretation.
“…The Hilbert envelope of the guided wave signals received at different receiver positions are presented in Figure 8 . The envelope of the guided wave signal obtained using Hilbert transform, H ( t ), can be expressed using the following equation [ 29 , 30 , 31 , 32 , 33 ]: …”
Section: Resultsmentioning
confidence: 99%
“…State-of-the-art reviews in the field of structural damage detection and localization using wavelet-based studies were conducted by several authors [ 26 , 27 , 28 , 29 , 30 ]. The detection and localization of wave-based impact damage in composite plates using CWT by analyzing the displacement of the mode shape is presented by Janeliukstis [ 14 ], and the wavelet coefficients were investigated by Fan [ 15 ].…”
Multilayered carbon fiber-reinforced polymers (CFRP) are increasingly used in aircraft components because of their superior mechanical properties. However, composite materials are vulnerable to impact loads, resulting in delamination-type damage which, if unnoticed, could lead to catastrophic structural failure. The objective of this research was to investigate possibilities to improve damage detection and the localization using signal processing methods. Numerical modeling using the semi-analytical finite element (SAFE) method was performed to obtain guided wave dispersion curves and to perform modal analysis. From the modal analysis, mode for inspection of the composite with delamination type defects was selected. From the numerical simulation, mode interaction with delamination along the longitudinal direction was analyzed and the location of the defect was estimated by measuring the time of flight (ToF) of the signal using Hilbert transform (HT) and continuous wavelet transform (CWT). The CWT has shown better results in estimating the delamination location compared with HT. The depth of delamination was characterized in the frequency domain by comparing the amplitude of the mode. Inverse fast Fourier transform (IFFT) is recommended to reconstruct the reflected and transmitted modes for better damage detection and to reduce the complexity of signal interpretation.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.