Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1987-05-01
1988-08-09
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73837, G01N 310
Patent
active
047620030
ABSTRACT:
Apparatus providing a device for testing the properties of material specimens at high temperatures and pressures in controlled water chemistries includes, inter alia, an autoclave housing the specimen which is being tested. The specimen is connected to a pull rod which couples out of the autoclave to an external assembly which includes one or more transducers, a force balance chamber and a piston type actuator. The pull rod feeds through the force balance chamber and is compensated thereby for the pressure conditions existing within the autoclave and tending to eject the pull rod therefrom. The upper end of the push rod is connected to the actuator through elements containing a transducer comprising a linear variable differential transformer (LVDT). The housing and coil assembly of the LVDT is coupled to a tube which runs through a central bore of the pull rod into the autoclave where it is connected to one side of the specimen. The movable core of the LVDT is coupled to a stem which runs through the tube where it is then connected to the other side of the specimen through a coupling member. A transducer in the form of a load cell including one or more strain gages is located on a necked-down portion of the upper part of the pull rod intermediate the LVDT and force balance chamber.
REFERENCES:
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patent: 4679441 (1987-07-01), Johnson et al.
McCarthy, H. A. et al. Autoclaves for metal. Journal of Physics, (GB) vol. 5, No. 8, Aug. 1972, pp. 790-792.
Constant Richard E.
Hightower Judson R.
Myracle Jerry W.
Randolph William W.
The United States Department of Energy
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