study of laser generated Rayleigh and Lamb waves in graphite/epoxy composites

  • 123 Pages
  • 4.38 MB
  • English
Rayleigh waves., Lamb waves., Ultrasonic waves., Composite materials., Epoxy re
Statementby Heeyong Park.
The Physical Object
Pagination123 leaves, bound :
ID Numbers
Open LibraryOL15296448M

To improve the reliability of delamination detection techniques based on Lamb waves for carbon fibre reinforced plastics (CFRP) composite laminates, the influence of excitation frequency of Lamb. In a non-contact approach (laser-based), a pulsed laser is used to generate elastic waves and a laser Doppler vibrometer or interferometers are used for collection and detection of structural.

Rose W.R., Rokhlin S.I., Adler L. () Evaluation of Anisotropic Properties of Graphite-Epoxy Composites Using Lamb Waves. In: Thompson D.O., Chimenti D.E. (eds) Review of Progress in Quantitative Nondestructive Evaluation. Review of Progress in Quantitative Nondestructive Evaluation, vol 6 A.

Springer, Boston, MACited by: Abstract. The anisotropy of graphite/epoxy composite plates was studied using measurements of phase and group velocities of Lamb waves.

Three types of composite structures were used: unidirectional, two-directional with orthogonal fibers, and by: 1. select beamsteering of laser generated ultrasound. book chapter full text access. beamsteering of laser generated ultrasound. select ultrasonic characterization of the nonlinear elastic properties of graphite/epoxy composites.

select experimental verification of lamb waves propagating with a negative group velocity. Laser-ultrasonics uses lasers to generate and detect ultrasonic waves. It is a non-contact technique used to measure materials thickness, detect flaws and carry out materials characterization. The basic components of a laser-ultrasonic system are a generation laser, a detection laser and a detector.

Aug 08,  · The paper is organized as follows. The theoretical background of the method to obtain the Lamb wave symmetric and asymmetric mode velocities is explained in section sensitivity of the elastic moduli to symmetric and asymmetric mode velocities at particular frequency–thickness (fd) product is explained in section method of reconstruction by using a genetic algorithm [] is.

The composite material used in this study is IM7/PETI-5, 1 provided by NASA Langley Research Center, VA.

The matrix material has a unique combination of properties including superior mechanical properties and thermal stability, excellent resistance to aircraft fluids, and easy processing in an by: Dynamic fracture of graphite/epoxy composites stiffened by buffer strips: An experimental study Dongyeon Leea, Hareesh Tippura,⇑, Phillip Bogertb a Department of Mechanical Engineering, Auburn University, ALUnited States bNASA Langley Research Center, Hampton, VAUnited States article info Article history: Available online 7 June Sep 17,  · Beamsteering of Laser Generated Ultrasound Rayleigh Wave Interaction with Discontinuities: A Numerical Model and an Experimental Study Non-Linear Acoustics Ultrasonic Characterization of the Non-Linear Elastic Properties of Graphite/Epoxy Composites Diffraction Tomography of the Acoustic Non-Linear Parameter Excitation of Lamb Waves By Book Edition: 1.

A Baseline and Vision of Ultrasonic Guided Wave Inspection Potential Ultrasonic guided wave inspection is expanding rapidly to many different areas of manu-facturing and in-service inspection. The purpose of this paper is to provide a vision of ultrasonic guided wave inspection potential as we move forward into the new millennium.

Laser machining of graphite- Kevlar- and glass-fiber reinforced epoxy composites were investigated with particular emphasis on laser parameters, cutting speed, quality of cut, gas emission and thermal damage. A computer numerically controlled CNC stage and a.

The carbon-fiber reinforced graphite/epoxy hybrids were prepared using a fixed amount of carbon fiber, and graphite incorporation in the epoxy of10 and wt%. This study shows that graphite/epoxy composites reinforced with carbon fiber present ce than conventional carbon.


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Sanfeliz, Pappu L.N. Murthy, and Christos C. Chamis National Aeronautics and Space Administration Lewis Research Center Cleveland, Ohio Replace pages 3 through 7 with revised pages 3 through 7.

Oct 17,  · UT Testing-Self Study Notes. charliechong. Download Share Add to Flag Embed. Copy embed code: Some of these wave modes such as 1 Rayleigh and 2 Lamb waves are also useful for ultrasonic inspection. Plate or Lamb waves are generated at an incident angle in which the parallel component of the velocity of the wave in the source is equal.

Jul 26,  · Ultrasonic guided wave inspection is expanding rapidly to many different areas of manufacturing and in-service inspection. The purpose of this paper is to provide a vision of ultrasonic guided wave inspection potential as we move forward into the new by: Laser Ultrasound Imaging of Lamb Waves in Thin Plates.

Study of Microplasticity of Solids by Laser Interferometry Method.

Description study of laser generated Rayleigh and Lamb waves in graphite/epoxy composites FB2

Pages Application of the Pseudo Wigner-Ville Distribution to the Measurement of the Dispersion of Lamb Modes in Graphite/Epoxy Plates. Pages This volume (Parts A and B) contains the edited papers presented at the annual Review of Progress in Quantitative Nondestructive Evaluation held at the University of California - San Diego, La Jolla, CA, on AugustThe Review was organized by the Center for NDE at Iowa State University.

Sep 25,  · This present work is on graphite-epoxy design for light weight high performance structure of an aircraft wing skin using computational technique.

MATLAB MuPAD software was used to derive an analytical model for aircraft wing loads using symbolic computation to estimate the shear force acting on the wings while Autodesk Simulation Composite Design and ANSYS 14 Mechanical APDL (ANSYS Cited by: 1.

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Graphite/epoxy (Gr/E) composites have attractive properties—low density, high stiffness, and a low coefficient of thermal expansion (CTE)—that make them prime candidates for many spacecraft applications.

The effects of a thermal cycling environment on the dimensional stability and microstructural integrity of Gr/E composites were by: These waves can also be generated remotely by strong Laser pulses. However, to generate this Rayleigh waves with amplitude in the measurement range of the ESPI technique, requires the application of high energy on the surface and its protection to prevent being damage.

In this study, two types of damage were introduced into an aluminum by: 2. To validate the solutions and present algorithm, results are compared with analytical solutions whenever available.

Examples include free-end reflection of waves in an isotropic solid rod, a two-layered isotropic cylinder, and a four-ply [ + 15/ −15/ +15/ −15] graphite/epoxy by: Lamb waves are generally known as “plate waves” and are elastic waves that can be generated in a solid plate with free boundaries.

Their propagation can be parallel and perpendicular to the plane of the plate, and their motion can be symmetrical and anti-symmetrical with Cited by: The papers which make up this volume reflect the very diverse nature of nondestructive evaluation; covering as they do topics ranging from traditional NDE to newly developing NDE.

Sep 01,  · This paper presents a method to more easily detect delamination damage within composite materials using finite element analysis modeling, through the covariance of energy change. Lamb waves were introduced and recorded through an actuator and sensors made of piezoelectric material.

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The data were then analyzed through the fast Fourier transform Author: Taylor Bruhschwein, Mijia Yang. An experimental study on disbond detection in a thermal insulation system using guided waves under a load-temperature environment.

Multiple scattering of Lamb waves by multiple corrosion pits in a plate. Guided-wave-based damage detection in a composite T-joint using 3D. graphite/epoxy composites. Looking ahead, approxi-mately half of the structural weight of the Air Force's advanced tactical fighter will be composite materials.

Composites of glass and carbon fibers surrounded by epoxy and polyester are being increasingly utilized in Dan D. Edie is professor of chemical engineering and co-director of. Abstract: A beamforming array technique with four sensors is applied to a cylindrical geometry for detecting point of impact.

A linear array of acoustic sensors attached to the plate record the waveforms of Lamb waves generated at the impact point with individual time delay. Quasi-residual strain and moduli measurements in materials using embedded acoustic waveguides.

Jul 01,  · The more complicated Lamb waves have also been numerically studied to gain physical insight into the relationship between the input parameters and the generated ultrasonic waves. The development of advanced materials such as composites needs a NDE technique for evaluation/characterization of the material by: Full text of "Analytical Ultrasonics in Materials Research and Testing" See other formats.A study to determine if industrial arts learning activities provide for junior high school industrial arts goals and human developmental tasks, Herbert Frederick Wedig.

PDF. A study to determine student-athletes' motivational climate influencing their athletic and academic performance at a Midwestern university, Percy Lee Caldwell. PDF.