SEDL / STP / STP722-EB / STP27601S

The Use of A-C Field Measurements to Determine the Shape and Size of a Crack in a Metal

Dover, WD
Reader in mechanical engineering, research assistant in mechanical engineering, lecturer in mechanical engineering, senior lecturer in mechanical engineering, and reader in mathematics, University College London,

Charlesworth, FDW
Reader in mechanical engineering, research assistant in mechanical engineering, lecturer in mechanical engineering, senior lecturer in mechanical engineering, and reader in mathematics, University College London,

Taylor, KA
Reader in mechanical engineering, research assistant in mechanical engineering, lecturer in mechanical engineering, senior lecturer in mechanical engineering, and reader in mathematics, University College London,

Collins, R
Reader in mechanical engineering, research assistant in mechanical engineering, lecturer in mechanical engineering, senior lecturer in mechanical engineering, and reader in mathematics, University College London,

Michael, DH
Reader in mechanical engineering, research assistant in mechanical engineering, lecturer in mechanical engineering, senior lecturer in mechanical engineering, and reader in mathematics, University College London,

Pages: 27    Published: Jan 1981

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Abstract

An instrument designed to measure the a-c field accurately has been built and fully tested on steel, aluminium, and titanium. These field measurements can be interpreted in terms of crack size, which provides a new technique for nondestructive testing (NDT) that requires no prior calibration. This paper describes the basic electronic measuring system, theoretical derivations of the electrical-field distribution, and application to industrial problems such as crack measurement in threads, shafting, welded connections, etc.