Stress measuring apparatus

Details Stress measuring apparatus Stress measuring apparatus

1979-05-23

1981-07-21

Myracle, Jerry W.

Measuring and testing

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

Threaded fastener stress

324209, F16B 3102

Patent

active

042791634

ABSTRACT:
A residual stress measuring apparatus for sensing a magnetic state of an object to measure a residual stress of the object comprises a magnetic sensor for sensing a magnetic state of the object to provide its state in the form of current and voltage, an AC power source for feeding an AC power to the magnetic sensor, a wattmeter for multiplying the current and the voltage supplied from the magnetic sensor to provide a variation of a core loss, and a calculator for converting the variation of the core loss into a residual stress of the object.

REFERENCES:
patent: 3866462 (1975-02-01), Fraudin
patent: 4135391 (1979-01-01), Dahle
Abuku, S. et al., "A Magnetic Method . . . Stress." Experimental Mechanics, May 1971. pp. 217-223.

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