Author
Cara A. C. Leckey
Other affiliations: University of South Carolina
Bio: Cara A. C. Leckey is an academic researcher from Langley Research Center. The author has contributed to research in topics: Delamination & Guided wave testing. The author has an hindex of 15, co-authored 64 publications receiving 982 citations. Previous affiliations of Cara A. C. Leckey include University of South Carolina.
Papers
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TL;DR: Results show the promise of local wavenumber domain analysis to characterize the depth of delamination damage in composite laminates and can find application in automated vehicle health assurance systems with potential for high detection rates and greatly reduced operator effort and setup time.
191 citations
TL;DR: In this paper, Laminated composites are susceptible to delamination due to their weak transverse tensile and interlaminar shear strength as compared to their in-plane properties.
Abstract: Laminated composites are susceptible to delamination due to their weak transverse tensile and interlaminar shear strengths as compared to their in-plane properties. Delamination damage can occur in...
109 citations
TL;DR: 3D EFIT simulations of guided wave propagation in undamaged and damaged anisotropic and quasi-isotropic composite plates are described and volumetric delamination data acquired via X-ray microfocus computed tomography is directly incorporated into the simulation.
102 citations
TL;DR: The continued and expanded use of composite materials in aerospace applications necessitates structural health monitoring and/or nondestructive evaluation techniques that can provide quantitative a... as discussed by the authors, which can provide qualitative information about structural health.
Abstract: The continued and expanded use of composite materials in aerospace applications necessitates structural health monitoring and/or nondestructive evaluation techniques that can provide quantitative a...
80 citations
TL;DR: Guided wavefield analysis methods for detection and quantification of crack damage in an aluminum plate are presented and simulation based studies show that spatial wavenumber imaging method is able to distinguish cracks of different severities.
73 citations
Cited by
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TL;DR: In this paper, the authors provide a state-of-the-art review of guided wave based structural health monitoring (SHM) and highlight the future directions and open areas of research in guided wave-based SHM.
Abstract: The paper provides a state of the art review of guided wave based structural health monitoring (SHM). First, the fundamental concepts of guided wave propagation and its implementation for SHM is explained. Following sections present the different modeling schemes adopted, developments in the area of transducers for generation, and sensing of wave, signal processing and imaging technique, statistical and machine learning schemes for feature extraction. Next, a section is presented on the recent advancements in nonlinear guided wave for SHM. This is followed by section on Rayleigh and SH waves. Next is a section on real-life implementation of guided wave for industrial problems. The paper, though briefly talks about the early development for completeness,. is primarily focussed on the recent progress made in the last decade. The paper ends by discussing and highlighting the future directions and open areas of research in guided wave based SHM.
664 citations
TL;DR: In this paper, a review of recent progress and methods for combining and integrating sonication into biomass pretreatment and conversion for fuels and chemicals is critically assessed, and the use of ultrasound in conversion of biomass to biofuels provides a positive process benefit.
317 citations
TL;DR: In this paper, the authors experimentally tested three composite structures made of glass fiber-reinforced plastic, hybrid composite with a core made of the same material and face sheets made of aluminum alloy and a carbon fiber reinforced plastic structure extracted from the vertical stabilizer of a military aircraft.
247 citations
TL;DR: An experimental study of the effect of temperature on the electrical impedance of the piezoelectric sensors used in the EMI technique showed that the temperature effects were strongly frequency-dependent, which may motivate future research in the SHM field.
Abstract: The electromechanical impedance (EMI) technique is considered to be one of the most promising methods for developing structural health monitoring (SHM) systems. This technique is simple to implement and uses small and inexpensive piezoelectric sensors. However, practical problems have hindered its application to real-world structures, and temperature effects have been cited in the literature as critical problems. In this paper, we present an experimental study of the effect of temperature on the electrical impedance of the piezoelectric sensors used in the EMI technique. We used 5H PZT (lead zirconate titanate) ceramic sensors, which are commonly used in the EMI technique. The experimental results showed that the temperature effects were strongly frequency-dependent, which may motivate future research in the SHM field.
200 citations