Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Patent
1991-12-02
1993-03-16
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
73797, 324222, G01N 332
Patent
active
051933950
ABSTRACT:
A device for the determination of residual stress in a material sample consisting of a sensor coil, adjacent the material sample, whose resistance varies according to the amount of stress within the material sample, a mechanical push-pull machine for imparting a gradually increasing compressional and tensional force on the material sample, and an impedance gain/phase analyzer and PC for sending an input signal to and receiving an input signal from the sensor coil. The PC will measure and record the change in resistance of the sensor coil and the corresponding amount of strain of the sample. The PC will then determine from the measurements of change of resistance and corresponding strain of the sample the point at which the resistance of the sensor coil is at a minimum and the corresponding value and type of strain of the sample at that minimum resistance point thereby enabling a calculation of the residual stress in the sample.
REFERENCES:
patent: 3969928 (1976-07-01), Zarka
patent: 4249423 (1981-02-01), Viertl et al.
patent: 4528856 (1985-07-01), Junker et al.
patent: 4852397 (1989-08-01), Haggag
patent: 5055784 (1991-10-01), Jaeger et al.
Determination of Residual Stresses in Sheet Metal Mar. 1981.
A Technique for Measuring Residual Stresses Jul. 1981.
Chern Engmin J.
Flom Yury
Clohan, Jr. Paul S.
Marchant R. Dennis
Miller Guy M.
Myracle Jerry W.
The United States of America as represented by the Administrator
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