Method of detecting plastic deformation in steel using a differe

Details Method of detecting plastic deformation in steel using a differe Method of detecting plastic deformation in steel using a differe

1996-11-15

1999-11-09

Strecker, Gerard

Electricity: measuring and testing

Magnetic

Stress in material measurement

324241, 324260, G01B 724, G01N 2782, G01R 3312

Patent

active

059821728

ABSTRACT:
To provide an effective method of nondestructively and easily judging plasticization of steel used in a real construction. A magnetic sensor 10 is made to scan along the surface of steel to detect a magnetic field caused by a magnetic anisotropy induced by plastic deformation of the steel, and the existence and position of the plasticization is judged from the state of distribution of the magnetic field. As a magnetic sensor, a differential type one comprised of detection coils 10a and 10b, the winding directions of which are opposite to each other, is used to compensate a magnetic field intrinsic to the steel.

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patent: 5423223 (1995-06-01), Weinstock

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