Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified load or strain transmission device from specimen...
Patent
1983-05-25
1985-06-11
Ruehl, Charles A.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified load or strain transmission device from specimen...
73855, 7386266, 338 6, G01B 718
Patent
active
045220662
ABSTRACT:
An extensometer having two spaced-apart mounting bases adapted to be mounted on a load-bearing structure with its axis of sensitivity intersecting the axis along which load-induced strains are generated at 45.degree.. The extensometer includes a pair of parallel links connecting the mounting bases through respective flexure hinges. In one embodiment, one of the links is also connected to one of the bases through an intermediate flexure hinge so that the link deforms responsive to relative movement applied between the bases along the axis of sensitivity. A strain gauge mounted on this link measures the magnitude of the deformation. In a second embodiment, a strain-instrumented measurement beam extends between the two links so that it deforms responsive to pivotal movement of the links as the mounting bases move in opposite directions along the axis of sensitivity. This embodiment of extensometer may be mounted on the load-bearing structure through three or more mounting points. In order to facilitate mounting of the extensometer on a structure without pre-straining the extensometer, a rigid plate may be connected to the extensometer through a plurality of pins, each of which extends from the plate through the extensometer at each of the mounting points. The pins terminate in a point and they are biased against the structure by a threaded fastener extending from the plate, through the extensometer, and into the structure.
REFERENCES:
patent: 3001291 (1961-09-01), Sjostrom
patent: 3832898 (1974-09-01), Randolph, Jr.
patent: 3995476 (1976-12-01), Hoffman
patent: 4058005 (1977-11-01), Barnett
Chinn Martin D.
Kistler Walter P.
Kistler-Morse Corporation
Ruehl Charles A.
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