Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Patent
1979-12-20
1982-02-09
Gill, James J.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
73781, 310333, G01B 716, G01L 116
Patent
active
043144810
ABSTRACT:
A piezoelectric strain/force transducer is described, which is attached preferably by only one locking screw to a test specimen or machine part. The force transmitting member of the transducer comprises two bearing surfaces at a distance apart, which bear frictionally on the surface of the machine part and experience a change in spacing in the case of a change in length of the machine part. Due to this, a resilient member, which can be adapted to a desired sensitivity of the gauge, is tensioned and a set of piezoelectric plates held under precompression in the force-transmitting member are subjected to a corresponding shearing force. The piezoelectric plates are cut or polarized so that they respond piezoelectrically solely to shearing forces. The resulting piezoelectric charge is a measurement of the strain or mechanical stress of the machine part and can be used for monitoring or controlling machines or components, in particular those which are subjected to cyclic loads.
REFERENCES:
patent: 3545283 (1970-12-01), McGwnigle
patent: 3614488 (1971-10-01), Sonderegger et al.
Derrer Hans-Rudolf
Sonderegger Hans-Conrad
Vollenweider Max
Wolfer Peter
Gill James J.
Kistler Instruments AG
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