Anisotropic effects on ultrasonic guided waves propagation in composite bends
TL;DR: Semi-Analytical Finite Element simulations revealing the capability of energy confinement carried by two types of guided modes in 90° carbon fiber/epoxy (CF/EP) bends and the feasibility of using such confined guided waves for rapid inspection of bent composite plate structures is discussed.
About: This article is published in Ultrasonics.The article was published on 2016-12-01. It has received 29 citations till now. The article focuses on the topics: Composite plate & Composite laminates.
Citations
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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.
75 citations
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.
59 citations
Cites background or methods from "Anisotropic effects on ultrasonic g..."
...2, a curvature-based rotation about the x3 axis ought to be implemented with 105 φ = g(x1, x2) being a function of nodal positions to account for the anisotropy across the bend region [12]....
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...method has gained its popularity to extract modal solutions for guided waves in irregularly shaped waveguides [5, 23, 24, 25, 26, 27] and in composite laminates [12, 28, 29, 30]....
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...In recent years, one particular branch of guided waves confined to local structural variation - feature guided waves (FGW) have received much attention and been discussed in the literature extensively [5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]....
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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.
Abstract: Adhesive bonding is widely used in aerospace composite structures. A continuous well-cured bond can offer good joint strength and improved fatigue and impact resistance, and is therefore crucial to the performance of the entire structure. This paper explores the feasibility of using feature guided waves (FGW) for rapid screening of the bond line between a stiffener and a carbon fiber reinforced polymer (CFRP) composite panel. Such FGWs are capable of focusing the wave energy along the stiffener and the bond layer, with limited radiation to the adjacent plate. The Semi-Analytical Finite Element (SAFE) approach is employed to understand the modal properties of FGWs that exist in the structure, and criteria are suggested to choose proper mode-frequency combination that is sensitive to adhesive defects. A shear horizontal type FGW mode is identified to be well suited, as it is easy to excite, and propagates with little dispersion and relatively low attenuation, while it retains sufficient energy around the bond layer. Both 3D Finite Element (FE) simulations and experiments are performed to study the interaction of the selected FGW mode with defects in the adhesive bond, and the results show excellent agreement. The reflection behavior and the wave-defect resonance phenomenon are investigated, which demonstrate the capability of the FGW for the bond line inspection.
50 citations
TL;DR: A reverse‐time migration imaging algorithm was combined with a numerical simulator—the three‐dimensional (3D) elastodynamic finite integration technique (EFIT)—to provide multi‐mode damage imaging that enables characterization of damage type and size, general sensitivity to unknown damage types, higher resolution imaging, and detectability regardless of the data acquisition system used.
46 citations
TL;DR: The possibility of application of Lamb wave-based structure health monitoring in bolted joint-like composite structures was achieved and results indicated that S0/A0 wave amplitudes decrease with the increasing of load.
Abstract: Online and offline monitoring of composite bolted joints under tensile load were investigated using piezoelectric transducers. The relationships between Lamb wave signals, pre-tightening force, the applied tensile load, as well as the failure modes were investigated. Results indicated that S0/A0 wave amplitudes decrease with the increasing of load. Relationships between damage features and S0/A0 mode were built based on the finite element (FE) simulation and experimental results. The possibility of application of Lamb wave-based structure health monitoring in bolted joint-like composite structures was thus achieved.
36 citations
References
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Book•
01 Jan 1973
TL;DR: In this article, the authors apply the material developed in the Volume One to various boundary value problems (reflection and refraction at plane surfaces, composite media, waveguides and resonators).
Abstract: This work, part of a two-volume set, applies the material developed in the Volume One to various boundary value problems (reflection and refraction at plane surfaces, composite media, waveguides and resonators). The text also covers topics such as perturbation and variational methods.
5,211 citations
Book•
29 Dec 1994
TL;DR: In this paper, the behavior and properties of composite materials are analyzed and new material based on the author's research and advances in the field is presented. But the authors do not discuss the performance of the new material.
Abstract: Engineering Mechanics of Composite Materials, 2/e analyzes the behavior and properties of composite materials-rigid, high-strength, lightweight components that can be used in infrastructure, aircraft, automobiles, biomedical products, and a myriad of other goods. This edition features additional exercises and new material based on the author's research and advances in the field.
1,865 citations
TL;DR: A comprehensive review on the state of the art of Lamb wave-based damage identification approaches for composite structures, addressing the advances and achievements in these techniques in the past decades, is provided in this paper.
1,350 citations
"Anisotropic effects on ultrasonic g..." refers background in this paper
...Guided waves are capable of interrogating the entire cross sectional area of the inspected structure and have high sensitivity to various defects [15,16]....
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936 citations