Method and apparatus for measuring and precisely locating intern

Electricity: measuring and testing – Magnetic – Stress in material measurement

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324202, 324227, G01B 724, G01N 2772, G01R 3300, G01R 3500

Patent

active

048810304

ABSTRACT:
A method and apparatus for ascertaining internal stresses in a hardened region to be tested for a component made of a predetermined material includes measuring coercive field strength and amplitude of magnetic Barkhausen noise as a function of mechanical stress and hardness in calibration samples of a predetermined material of known hardness and known internal stress. Calibration functions are ascertained from the measured values indicating the dependency of the hardness and the amplitude of the magnetic Barkhausen noise as functions of the hardness and mechanical stress. The coercive field strength and the amplitude of the magnetic Barkhausen noise is measured in a location-dependent manner over the region of the component to be tested. The measured values of the coercive field strength and the amplitude of the magnetic Barkhausen noise are converted in the region to be tested into location-dependent hardness and into location-dependent mechanical stress using the ascertained calibration functions. The location-dependent mechanical stress and the location-dependent hardness in the region to be tested are present independently of one another and are available for further processing.

REFERENCES:
patent: 3697866 (1972-10-01), Kanda et al.
patent: 4692701 (1987-09-01), Dundas et al.
patent: 4771237 (1988-09-01), Daley

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