Journal ArticleDOI
Longitudinal guided waves confined in radius filler regions of composite joints.
Reads0
Chats0
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
More filters
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
More filters
Journal ArticleDOI
Symmetric low-frequency feature-guided ultrasonic waves in thin plates with transverse bends.
TL;DR: This paper focuses on the faster bend-guided mode that is similar to the S0 (fundamental symmetric) Lamb mode in flat plates that is shown to be more strongly generated in smaller angle bends.
Journal ArticleDOI
Trapped modes in topographically varying elastic waveguides
TL;DR: In this paper, the authors developed an asymptotic procedure that encapsulated the essential physics within a single ordinary differential equation for the problem of trapped modes within elastic waveguides.
Journal ArticleDOI
Effects of composite lamina properties on fundamental Lamb wave mode dispersion characteristics
TL;DR: In this article, the effect on the Lamb wave propagation/dispersion due to changes in the material properties such as E 11, E 22, G 12, and density were analyzed for three different composite laminate types, all constructed out of 16-plies of unidirectional carbon-fiber epoxy prepregs.
Journal ArticleDOI
Antisymmetric feature-guided ultrasonic waves in thin plates with small radius transverse bends from low-frequency symmetric axial excitation
TL;DR: The influence of bends constituting annular polygonal structures on ultrasonic guided waves propagating along their axis is investigated and a slower bend-guided mode that is similar to the A0 (fundamental anti-symmetric) Lamb mode in flat plates is identified.
Journal ArticleDOI
Shear horizontal feature guided ultrasonic waves in plate structures with 90° transverse bends.
TL;DR: Semi-Analytical Finite Element (SAFE) method simulations reveal the existence of a new family of Shear Horizontal (SHB) type of FGW mode in 90° bends in plate structures, demonstrating the SH-like nature of a bend-confined mode identified in studies of power flow across the bend.