Measuring and testing – Ductility or brittleness
Patent
1977-03-24
1978-06-13
Ruehl, Charles A.
Measuring and testing
Ductility or brittleness
33 1H, G01B 716
Patent
active
040941892
ABSTRACT:
This instrument is a portable field device that quickly determines microscopic creep velocity by measuring relative displacement between two objects connected by a metal wire. The device consists of a micro-creepmeter probe and recorder. The probe includes a linear variable differential transformer disposed within a cylindrical housing which is secured to one of the objects with a multi-directional ball joint fitting. An extendable piston rod slidably disposed within the housing is secured to the other object by means of a dual wire arrangement, which is also used to electronically compensate for temperature effects from solar radiation and variable wind. The transformer core is attached to the inner end of the piston rod and is translated axially by the piston rod through the sensing field of the linear variable differential transformer. A pair of linear ball bearings holds the piston rod free from axial friction within the cylindrical housing. The piston rod is also held free from rotary friction effects by use of rotary ball bearings at both ends. The freely moving piston rod is made water and dust proof by a special arrangement of O-rings, flexible bellows and environmentally sealed rotary ball bearings. The output signal of the friction-free microcreep displacement from the probe is fed into a portable electronic recorder which gives a direct microcreep velocity reading in terms of 10-.sup.6 inches per minute.
REFERENCES:
patent: 3082621 (1963-03-01), Soderholm
patent: 3562916 (1973-02-01), Duckworth
patent: 3828435 (1974-08-01), Baker
Technology News from the Bureau of Mines, "Horizontal Roof Strain Indicator (HORSI)," Dec. 1976.
Ruehl Charles A.
Zimmerman Harris
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