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Titolo:
DETERMINATION OF ELASTIC-MODULI, DENSITY, ATTENUATION, AND THICKNESS OF A LAYER USING ULTRASONIC SPECTROSCOPY AT 2 ANGLES
Autore:
LAVRENTYEV AI; ROKHLIN SI;
Indirizzi:
UNITED TECHNOL RES CTR,411 SILVER LANE,MS 129-86 E HARTFORD CT 06108 OHIO STATE UNIV,NONDESTRUCT EVALUAT PROGRAM COLUMBUS OH 43210
Titolo Testata:
The Journal of the Acoustical Society of America
fascicolo: 6, volume: 102, anno: 1997,
pagine: 3467 - 3477
SICI:
0001-4966(1997)102:6<3467:DOEDAA>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
THIN-VISCOELASTIC PLATE; ADHESIVE JOINTS; PHASE-VELOCITY; NONDESTRUCTIVE EVALUATION; COHESIVE PROPERTIES; CONSTANTS;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
25
Recensione:
Indirizzi per estratti:
Citazione:
A.I. Lavrentyev e S.I. Rokhlin, "DETERMINATION OF ELASTIC-MODULI, DENSITY, ATTENUATION, AND THICKNESS OF A LAYER USING ULTRASONIC SPECTROSCOPY AT 2 ANGLES", The Journal of the Acoustical Society of America, 102(6), 1997, pp. 3467-3477

Abstract

An ultrasonic method for determination of the complete set of acoustical and geometrical properties of an isotropic layer embedded between two known materials (similar or dissimilar) is described. The method allows simultaneous determination of the layer thickness, density, elastic moduli, and attenuation (longitudinal and shear) from normal and oblique incidence reflection (transmission) frequency spectra. Reflection (transmission) from the layer is represented as a function of six nondimensional parameters which are determined from the two experimentally measured spectra: one at normal and one at oblique incidence. The introduction of the set of nondimensional parameters allows one to transform the reconstruction process from one search in a six-dimensionalspace to two searches in three-dimensional spaces (one search for normal incidence and one for oblique). Thickness, density, and longitudinal and shear elastic moduli of the layer are calculated from the nondimensional parameters determined. The sensitivity of the method to individual properties and its stability against experimental noise are studied and the inversion algorithm is accordingly optimized. Experimental examples are given for a layer immersed in water and for a thermoplastic joint. (C) 1997 Acoustical Society of America. [S0001-4966(97)01012-6].

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Documento generato il 25/11/20 alle ore 07:25:53