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Titre du document / Document title

Ultrasonic attenuation and velocity changes in multilayer structures containing multiple delaminations

Auteur(s) / Author(s)

JIE ZHU (1) ; WENWU CAO (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Materials Research Institute, Pennsylvania State University, University Park, PA 16802, ETATS-UNIS

Résumé / Abstract

Delaminations between ceramic and electrode layers in multilayer capacitors and multilayer actuators are common discontinuities that are difficult to detect using ultrasonic imaging if the diameter is smaller than 50 μm. Detailed theoretical analysis has been performed for the propagation of ultrasonic waves in multilayer structures containing multiple delaminations. The T-matrix approach is used to treat wave attenuation in periodic structures with alternating ceramic and electrode layers. Multiple penny-shaped delaminations are assumed perpendicular to the incidence wave and the forward scattering amplitude of the wave from delaminations is calculated by substituting the average effective crack opening displacement into the scattered wave displacement. The effective phase velocity, wave amplitude and attenuation coefficient have been calculated for different crack densities. The results provide a theoretical base for attenuation based nondestructive testing (NDT) to assess the degree of delaminations in multilayer structures.

Revue / Journal Title

Materials evaluation    ISSN  0025-5327   CODEN MAEVAD 

Source / Source

2006, vol. 64, no4, pp. 417-422 [6 page(s) (article)] (23 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Society for Nondestructive Testing, Columbus, OH, ETATS-UNIS  (1964) (Revue)

Mots-clés anglais / English Keywords

Wave scattering

;

Crack opening displacement

;

Ultrasound imaging

;

Acoustic image

;

Ultrasonic imaging

;

Discontinuity

;

Periodic structure

;

Capacitor

;

Electrodes

;

Ceramic materials

;

Delamination

;

Crack array

;

Stratified material

;

Propagation velocity

;

Sound velocity

;

Wave damping

;

Measurement

;

Non destructive test

;

Ultrasonic control

;

Actuator

;

Metrology

;

Mots-clés français / French Keywords

Diffusion onde

;

COD

;

Imagerie ultrasonore

;

Image acoustique

;

Formation image ultrason

;

Discontinuité

;

Structure périodique

;

Condensateur

;

Electrode

;

Céramique

;

Délaminage

;

Réseau fissure

;

Matériau stratifié

;

Vitesse propagation

;

Célérité son

;

Amortissement onde

;

Mesure

;

Essai non destructif

;

Essai ultrason

;

Actionneur

;

Métrologie

;

Mots-clés espagnols / Spanish Keywords

Difusión onda

;

COD

;

Imageria ultrasonico

;

Imagen acústica

;

Formación imagen ultrasónico

;

Discontinuidad

;

Estructura periódica

;

Condensador

;

Electrodo

;

Cerámica

;

Delaminación

;

Red fisura

;

Material estratificado

;

Velocidad propagación

;

Velocidad sonido

;

Amortiguación onda

;

Medida

;

Ensayo no destructivo

;

Ensayo ultrasonido

;

Accionador

;

Metrología

;

Mots-clés d'auteur / Author Keywords

ultrasonic attenuation

;

multilayer structure

;

delamination

;

multilayer ceramic capacitor

;

Localisation / Location

INIST-CNRS, Cote INIST : 6887, 35400015329023.0080

Nº notice refdoc (ud4) : 17651923



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