Eddy current test method for residual stress in non-ferromagneti

Details Eddy current test method for residual stress in non-ferromagneti Eddy current test method for residual stress in non-ferromagneti

1995-10-10

1997-03-11

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Stress in material measurement

324225, 324238, G01B 724, G01N 2790, G01R 3312

Patent

active

056105150

ABSTRACT:
A novel test method enabling residual stress in non-ferromagnetic metal objects to be reliably measured which requires particular circuit elements in the alternating current bridge circuit being employed for measurement to be environmentally controlled. In doing so, the selected circuit resistor elements are thermally isolated in a manner enabling lift-off impedance values to non-destructively measure near-surface residual stress in the metal object being tested.

REFERENCES:
patent: 4528856 (1985-07-01), Junker et al.
patent: 4706020 (1987-11-01), Viertl et al.
patent: 4893079 (1990-01-01), Kustra et al.
patent: 5055784 (1991-10-01), Jaeger et al.
patent: 5184071 (1993-02-01), Tasca

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