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Title: Theory and numerical calculation of the acoustic field exerted by eddy-current forces

Abstract

The equations for calculating the acoustic field produced within a nonmagnetic metal by interaction of eddy currents with a static magnetic field were obtained on the assumptions (1) an ultrasonic wave is generated by the electromagentic force through classical and macroscopic phenomena; (2) the electric, magnetic, and elastic properties of the metal are linear, isotropic, and homogeneous throughout the metal, which occupies semi-infinite space; (3) the whole system is axially symmetric; and (4) eddy currents and elastic waves show a steady-state sinusoidal variation. The acoustic field produced by a specific electromagnetic ultrasonic transducer with axial symmetry was calculated numerically, and the results showed a well-defined ultrasonic wave beam, which was narrower than had been expected from the size of the transducer. (auth)

Authors:
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
7368417
Report Number(s):
ORNL-5065
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; ULTRASONIC TESTING; TRANSDUCERS; COMPUTER CALCULATIONS; DESIGN; EDDY CURRENTS; MAGNETIC FIELDS; ULTRASONIC WAVES; ACOUSTIC TESTING; CURRENTS; ELECTRIC CURRENTS; MATERIALS TESTING; NONDESTRUCTIVE TESTING; SOUND WAVES; TESTING; 420500* - Engineering- Materials Testing

Citation Formats

Kawashima, K. Theory and numerical calculation of the acoustic field exerted by eddy-current forces. United States: N. p., 1976. Web. doi:10.2172/7368417.
Kawashima, K. Theory and numerical calculation of the acoustic field exerted by eddy-current forces. United States. https://doi.org/10.2172/7368417
Kawashima, K. 1976. "Theory and numerical calculation of the acoustic field exerted by eddy-current forces". United States. https://doi.org/10.2172/7368417. https://www.osti.gov/servlets/purl/7368417.
@article{osti_7368417,
title = {Theory and numerical calculation of the acoustic field exerted by eddy-current forces},
author = {Kawashima, K.},
abstractNote = {The equations for calculating the acoustic field produced within a nonmagnetic metal by interaction of eddy currents with a static magnetic field were obtained on the assumptions (1) an ultrasonic wave is generated by the electromagentic force through classical and macroscopic phenomena; (2) the electric, magnetic, and elastic properties of the metal are linear, isotropic, and homogeneous throughout the metal, which occupies semi-infinite space; (3) the whole system is axially symmetric; and (4) eddy currents and elastic waves show a steady-state sinusoidal variation. The acoustic field produced by a specific electromagnetic ultrasonic transducer with axial symmetry was calculated numerically, and the results showed a well-defined ultrasonic wave beam, which was narrower than had been expected from the size of the transducer. (auth)},
doi = {10.2172/7368417},
url = {https://www.osti.gov/biblio/7368417}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1976},
month = {Thu Jan 01 00:00:00 EST 1976}
}