Journal ArticleDOI
Longitudinal guided waves confined in radius filler regions of composite joints.
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TLDR
Semi-analytical finite element simulations are used to demonstrate the existence of a longitudinal guided ultrasonic mode confined or trapped in the Noodle regions, and reveal that this mode has attractive properties for rapid screening of Noodle joints, including strong energy concentration, low dispersion, and attenuation.Abstract:
This paper studies the feasibility of using ultrasonic guided waves for fast inspection of conformal deltoid radius filler or “Noodle” regions of joints in stringer composite structures. Semi-analytical finite element simulations, supported by experiments and three-dimensional finite element models, are used to demonstrate the existence of a longitudinal guided ultrasonic mode confined or trapped in the Noodle regions. Studies reveal that this mode has attractive properties for rapid screening of Noodle joints, including strong energy concentration, low dispersion, and attenuation. Discussing the physics of mode confinement in light of material differences and geometry, the phenomenon is shown to be related to feature-guiding effects noted in literature recently.read more
Citations
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Journal ArticleDOI
Outlier analysis for defect detection using sparse sampling in guided wave structural health monitoring
Jagadeeshwar L. Tabjula,Srijith Kanakambaran,Sheetal Kalyani,Prabhu Rajagopal,Balaji Srinivasan +4 more
TL;DR: The feasibility of detection of delamination is experimentally demonstrated, whose size is comparable to the ultrasonic wavelength with probability of detection better than 90% using <1% of the total number of samples required for conventional imaging, even under conditions wherein the SNR is as low as 5 dB.
Journal ArticleDOI
Damage detection in quasi-isotropic composite bends using ultrasonic feature guided waves
TL;DR: In this article, the feasibility of using ultrasonic feature guided waves (FGW) for rapid screening of typical 90° bends made of quasi-isotropic composite laminates is explored.
Journal ArticleDOI
Feature guided wave inspection of bond line defects between a stiffener and a composite plate
TL;DR: In this paper, a feature guided wave (FGW) was used for rapid screening of the bond line between a stiffener and a carbon fiber reinforced polymer (CFRP) composite panel.
Journal ArticleDOI
Deep subwavelength ultrasonic imaging using optimized holey structured metamaterials
TL;DR: The experimental demonstration of deep subwavelength ultrasonic imaging of defects in metallic samples with a feature size of λ/25 using holey-structured metamaterial lenses shows how the extraordinary transmission capacity of holey structured metam material comes about by the coupling of higher frequencies in the incident ultrasonic wave field to resonant modes of the lens.
Journal ArticleDOI
Rapid guided wave inspection of complex stiffened composite structural components using non-contact air-coupled ultrasound
TL;DR: In this article, the authors demonstrate a rapid, fully non-contact inspection technique for a full-scale complex composite structural component using air-coupled ultrasonic guided waves.
References
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Book
Ultrasonic Waves in Solid Media
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Review of z-pinned composite laminates
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On the use of absorbing layers to simulate the propagation of elastic waves in unbounded isotropic media using commercially available Finite Element packages
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Finite element model for waves guided along solid systems of arbitrary section coupled to infinite solid media.
TL;DR: The paper presents the principles of a procedure and then validates and illustrates its use on some examples, and makes use of absorbing regions of material at the exterior bounds of the discretized domain.
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Wave propagation along transversely periodic structures
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