Laser ultrasonic investigation of the elastic properties of unidirectional graphite-epoxy composites

Karabutov, Alexander A.; Kershtein, I. M.; Pelivanov, Ivan; Podymova, N. B.

doi:10.1007/bf02254668

Cited by 11 publications

(2 citation statements)

References 14 publications

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“…As a lot of the research on Lamb waves has been carried out, in recent, considerable applications have been reported, for example, defect detection in metal and composite plates [1], sheet thickness measurement [2], elastic constant evaluation [3] and bonded metal joint inspection [4].…”

Section: Introductionmentioning

confidence: 99%

Imaging of Defects in Thin Plate by Scanning of Laser-Generated Focused-Lamb Waves

Jhang¹,

Jung

Kim

et al. 2004

KEM

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An arc array slit is used for generating the focused Lamb wave by laser, where spatially expanded Nd:YAG pulse laser is illuminated through the arc array slit on the surface of a sample plate to generate the Lamb wave of the same pattern as the slit. Then the generated Lamb wave is focused at the focal point of which distance from the slit position is dependent on the curvature of slit arc. The focusing effect enables to acquire higher intensity of wave at the focus, better SNR in the received signal, and improved spatial resolution than when we use the conventional line array slit. This paper proposes a new imaging technique using this laser-generated focused Lamb-wave, which gives more accurate information about the size and the location of defects in thin plate. In order to verify the usefulness of the proposed method, experiments is carried out for the detection of the artificial linear and circular defects on a thin aluminum plate.

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Section: Introductionmentioning

confidence: 99%

Imaging of Defects in Thin Plate by Scanning of Laser-Generated Focused-Lamb Waves

Jhang¹,

Jung

Kim

et al. 2004

KEM

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“…From numerical scheme implementation, the stiffness coefficients are derived employing the Christofell equations that related each recorded velocity phase to these [210,212].…”

Section: Vi241 Elastic Coefficients From Measurementsmentioning

confidence: 99%

Development of green composites based on epoxidized vegetable oils (EVOs) with hybrid reinforcements: natural and inorganic fibers.

Motoc¹

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BACKGROUNDThe overall aim of the work is to provide comprehensive means of predicting and characterizing the properties of principal hybrid polymer based composite architectures that can simultaneously yield results of practical utility. This is accomplished by comparing, whenever possible, the theoretical predictions for the effective properties to available experimental data.The present work is divided into two parts. Part I deals with the author's scientific achievements that enabled to characterize quantitatively the main effective properties of self-developed hybrid polymer based composite architectures and different theoretical and computer-simulation methods used for comparison. Part II identifies future directions for scientific and research evolution and development.The introductory chapter in Chapter I was reserved to the state-of-the-art in the subject intended to be covered with the main body of the PhD thesis. This was done on purpose to illustrate the importance of developed subject that is under continuous evolution and that expanded after herein contributions. It is noteworthy that significant advances have been made recently in the quantitative characterization of hybrid composite materials of any type both theoretically and experimentally.The general objectives (Chapter II) were underlined and concise delivered to give the reader a preview of the concepts that will be discussed specifically in the subsequent chapters. Indirectly, they point toward one of the main aims of this work, namely to provide a direction for systematically analysis of hybrid polymer based composite materials.Chapter III was dedicated to the brief presentation of individual materials' selection, manufacturing issues, details on hybrid microstructures and finally, some practical information on experimental devices and settings considered. Practically, reproducibility issue of the experimental data processing can be potentially addressed through sharing these particular information results.Chapter IV provides several theoretical models used deploying a multi-step homogenization scheme to apply for individual combinations and effective property under consideration. These theoretical models were selected due to their ability to describe the 'details of the microstructures' (i.e. constitutive volume fractions, orientations, sizes, shapes, spatial distributions and surface areas of interfaces, etc.) and ability to encompass particular information that can be ascertained in practice.In the light of above, particular concerns were given to those structure/property relations that can be easily understood by apprentices, unaccustomed researchers on engineering field and finally, to materials' designers bounded by cost and time to perform measures on their mechanical applications for all possible combinations, phase properties and microstructures aimed to be developed.Chapter V extensively approaches the effective mechanical, dynamical, thermal stability and conductivity, fire retardant and electrical conductivity of particular hybr...

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Application of Laser-Ultrasonic Technique of Acoustic Impedance Measurement with Signals Detection by Backward-Mode Scheme for Porosity Content Evaluation in CFRP Laminates

2020

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Laser ultrasonic investigation of the elastic properties of unidirectional graphite-epoxy composites

Cited by 11 publications

References 14 publications

Imaging of Defects in Thin Plate by Scanning of Laser-Generated Focused-Lamb Waves

Imaging of Defects in Thin Plate by Scanning of Laser-Generated Focused-Lamb Waves

Development of green composites based on epoxidized vegetable oils (EVOs) with hybrid reinforcements: natural and inorganic fibers.

Application of Laser-Ultrasonic Technique of Acoustic Impedance Measurement with Signals Detection by Backward-Mode Scheme for Porosity Content Evaluation in CFRP Laminates

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