Nondestructive method of quantitatively evaluating degree of pla

Details Nondestructive method of quantitatively evaluating degree of pla Nondestructive method of quantitatively evaluating degree of pla

1998-07-17

2000-08-29

Noland, Thomas P.

Electricity: measuring and testing

Magnetic

Stress in material measurement

324227, G01N 2772

Patent

active

061114057

ABSTRACT:
In a nondestructive method of quantitatively evaluating a degree of plasticity of ferromagnetic materials, a magnetic field of a surface of a ferromagnetic test body is measured using a magnetic sensor, and the surface of the ferromagnetic test body is partitioned into regions corresponding to domains of the ferromagnetic test body. A difference between a maximum value and a minimum value of a magnetic signal corresponding to the magnetic field for each of the domains is calculated as a spatial difference amount. A distribution width of the spatial difference amounts and an amount of residual strain corresponding to an amount of plastic deformation of the ferromagnetic test body is measured. A correlation between the distribution width of the spatial difference amounts and the amount of residual strain is calculated. A degree of plasticity of the ferromagnetic test body in calculated in accordance with the correlation.

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patent: 5423223 (1995-06-01), Weinstock
patent: 5666051 (1997-09-01), Junker et al.
patent: 5767671 (1998-06-01), McCoy et al.

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