Geometrical instruments – Area integrators – Electrical
Patent
1983-07-29
1985-07-09
Stearns, Richard R.
Geometrical instruments
Area integrators
Electrical
33148D, 73781, G01B 716, G01N 1906
Patent
active
045273359
ABSTRACT:
An extensometer is used for measuring axial and diametral strains in a material test specimen. The extensometer comprises an assembly of extensometer sections positioned on diametrally opposite sides of the specimen with specimen engaging points spaced axially along the specimen. The extensometer assembly is arranged so that the two extensometer sections will average the axial strain measured by the two extensometer sections. Also, if desired, the two extensometer sections may provide an indication of the average change in diameter of the specimen at the location of the upper contact points and at the location of the lower contact points of the extensometer sections on opposite sides of the specimen. The support system between the extensometer sections provides for the necessary degrees of freedom to provide measuring only in the axis desired, and sufficient restraint in other axes to insure that accurate measurements are obtained.
REFERENCES:
patent: 2416664 (1947-02-01), Ruge
patent: 2663085 (1953-12-01), Ruge
patent: 2921282 (1960-01-01), Krouse et al.
patent: 3402472 (1968-09-01), Riley
patent: 3789508 (1974-02-01), Meline
patent: 3802781 (1974-04-01), Wright
patent: 4010640 (1977-03-01), Krieger, Jr.
patent: 4251918 (1981-02-01), Duggan
MTS Systems Corporation
Stearns Richard R.
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