Method for measuring stress of ferromagnetic metal member, metho

Details Method for measuring stress of ferromagnetic metal member, metho Method for measuring stress of ferromagnetic metal member, metho

1995-09-06

1997-07-22

Dombroske, George M.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

Specified electrical sensor or system

73768, 73774, G01B 716

Patent

active

056505701

ABSTRACT:
In measuring the stress of a ferromagnetic linear metal member, an alternating current is supplied to flow between a pair of terminals mounted to the ferromagnetic linear metal member to measure an impedance .vertline.Z.vertline. of the ferromagnetic linear metal member between the terminals by an analyzer. Then, a stress .sigma. is determined based on the measured value of the impedance .vertline.Z.vertline. from an impedance .vertline.Z.vertline.-stress .sigma. relationship possessed by the ferromagnetic linear metal member. The stress distribution in a sheet-like sensor can be likewise measured by inserting into the sensor a plurality of intersecting ferromagnetic linear metal members. The stress .sigma. is determined for each individual member as described above, and then the stress distribution in the sheet-like sensor is determined by summing up the stresses of mutually intersecting members.

REFERENCES:
patent: 4050313 (1977-09-01), Shimada et al.
patent: 4140023 (1979-02-01), Edwards et al.
patent: 4142405 (1979-03-01), Stevens
patent: 4503710 (1985-03-01), Oertle et al.
patent: 4744252 (1988-05-01), Stout

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