Journal ArticleDOI
Delamination Size Detection using Time of Flight of Anti-symmetric (Ao) and Mode Converted Ao mode of Guided Lamb Waves:
TLDR
In this article, an attempt has been made to quantitatively assess the extent of delamination in composite laminates, using time-of-flight of fundamental Lamb wave modes, without recourse to baselin.Abstract:
In this article an attempt has been made to quantitatively assess the extent of delamination in composite laminates, using time-of-flight of fundamental Lamb wave modes, without recourse to baselinread more
Citations
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Journal ArticleDOI
A quantitative multidamage monitoring method for large-scale complex composite:
TL;DR: In this article, a delay-and-sum imaging algorithm is applied to multidamage monitoring in large-scale composites, where the consumed time and computation resource are too much for pixel value calculation.
Journal ArticleDOI
Instantaneous delamination detection in a composite plate using a dual piezoelectric transducer network
TL;DR: In this paper, the authors proposed a new damage detection technique based on the assumption that the fundamental anti-symmetric (A0) mode slows down when it passes through a delamination area while the speed of the fundamental symmetric (BS) mode is little affected by delamination.
Journal ArticleDOI
Real-time damage mechanisms assessment in CFRP samples via acoustic emission Lamb wave modal analysis
Abstract: This paper proposes a very promising acquisition-analysis procedure to evaluate real-time damage in carbon fiber-reinforced polymer (CFRP) composite plates by means of the acoustic emission (AE) method. It shows how, by using appropriate acquisition frequency filters and very narrow time windows, it is possible to avoid reflection at boundaries and successfully split the A0 and S0 Lamb modes of the AE signals. After that, an appropriate algorithm —based on the comparison of strength of both modes in time and frequency domains— allows one to associate each AE event to a particular damage mechanism (delamination, fiber breaking and matrix micro-cracking). Experimental results from three point bending tests carried out on 22-layer CFRP samples, with delamination artificially induced by a Teflon film, clearly demonstrate the real-time evaluation of the induced delamination and the beginning and growth of new ones.
Journal ArticleDOI
Characterization of delamination-type damages in composite laminates using guided wave visualization and air-coupled ultrasound:
TL;DR: A combination of plate-guided ultrasound and air-coupled ultrasonics is used to locate and visualize delaminations in composite laminates using wave visualization method as mentioned in this paper.
Journal Article
The interaction of Lamb waves with delaminations in composite laminates
Ningqun Guo,Peter Cawley +1 more
TL;DR: In this article, the S0 Lamb mode can propagate over distances of the order of 1 m in composite laminates and so has the potential to be used in long-range nondestructive inspection.
References
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Journal ArticleDOI
The interaction of Lamb waves with delaminations in composite laminates
Ningqun Guo,Peter Cawley +1 more
TL;DR: In this paper, the S0 Lamb mode can propagate over distances of the order of 1 m in composite laminates and so has the potential to be used in long-range nondestructive inspection.
Journal ArticleDOI
Lamb wave-based quantitative identification of delamination in CF/EP composite structures using artificial neural algorithm
Zhongqing Su,Lin Ye +1 more
TL;DR: In this paper, a Lamb wave-based quantitative identification technique for delamination in CF/EP composite structures was established, where the propagation of Lamb waves in a series of composite laminates, individually bearing a delamination, was evaluated using dynamic FEM analyses.
Journal ArticleDOI
Multiple reflections of Lamb waves at a delamination.
TL;DR: Wave propagation in laminated plates with delaminations was calculated using the semi-analytical finite element method and deeper numerical analyses revealed the following phenomena on the fundamental Lamb modes at delamination regions of laminate plates.
Journal ArticleDOI
Leaky Lamb waves in an anisotropic plate. I: An exact solution and experiments
Vinay Dayal,Vikram K. Kinra +1 more
TL;DR: In this article, the propagation of leaky Lamb waves in a plate consisting of a general balanced symmetric composite material is considered both analytically as well as experimentally, and an exact solution for the dispersion equation is obtained.
Journal ArticleDOI
Interaction of the primary anti-symmetric Lamb mode (Ao) with symmetric delaminations: numerical and experimental studies
TL;DR: In this paper, the interaction of an ultrasonic guided Lamb wave mode with delamination type defects in a quasi-isotropic laminated composite plate has been studied, using both simulations and experiments.
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Lamb wave method for quick inspection of impact-induced delamination in composite laminates
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