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An Eddy Current Method for the Inspection of Shell Cases / J. E. Dinger, Ross Gunn

Conference Author
Symposium on Stress-Corrosion Cracking of Metals (1944 : Philadelphia, Pa.)
Physical Description
1 online resource (11 pages) : illustrations, figures, tables
Additional Creators
Gunn, Ross, 1897-1966, Dinger, J. E., American Society for Testing and Materials, and ASTM International
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Summary
Faraday's Law of magnetic induction states that the e.m.f. acting around a closed circuit is equal to the time rate of change of flux through that circuit. If the closed circuit is a conducting medium, there will flow an electric current which is proportional to the conductivity of the material and the time rate of change of the flux. Electrical currents so induced in a conducting material are often referred to as eddy currents. Eddy currents are thus induced into a conducting material by (1) a time rate of change of the magnetic field through the material, by (2) a relative motion of the conducting material and a magnetic field, or by (3) a combination of (1) and (2). Because the magnitude of the induced eddy currents is dependent upon the resistance of the equivalent conducting path, these currents offer a method of detecting electrical discontinuities in a conducting material. A flaw, such as a season crack in brass, is a definite electrical discontinuity which raises the resistance of the equivalent path of the region.
Dates of Publication and/or Sequential Designation
Volume 1945, Issue 64 (January 1945)
Subject(s)
ISBN
9780803159037 (e-ISBN)
9780803160576
Digital File Characteristics
text file PDF
Bibliography Note
Includes bibliographical references 2.
Other Forms
Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
Full text article also available for purchase.
Also available in PDF edition.
Reproduction Note
Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1945. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.
Technical Details
Mode of access: World Wide Web.
Source of Acquisition
ASTM International PDF Purchase price USD25.
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