Gage for measuring displacements in rock samples

Patent · Tue May 13 04:00:00 EDT 1986

OSTI ID:5631565

Holcomb, D J; McNamee, M J

A gage is described for measuring strain in a rock sample, comprising: (a) a mounting ring having an inner diameter slightly greater than the diameter of the sample; (b) means for mounting the ring on the sample, the mounting means including an adjustment means providing a first point of contact between the ring and sample, and attachment means connected to the ring for providing a second point of contact between the ring and sample, the attachment means being generally immovable in a direction perpendicular to the plane of the ring to support the weight of the ring on the sample, the attachment means being yieldable diametrically by a distance equal to a change in the diameter of the sample in response to diametric strain in the rock sample; and (c) sensor means including strain transmitting means in contact with the attachment means for accurately transmitting movement of the attachment means caused by strain in the rock sample to the sensor means producing a variable output in proportion to strain, the strain transmitting means being independent of forces acting upon the attachment means and thereby being isolated from the forces by the attachment means.

• Assignee: Dept. of Energy, Washington, DC
• Patent Number(s): US 4587739
• OSTI ID: 5631565
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
DESIGN
DISTANCE
MEASURING INSTRUMENTS
ROCKS
SAMPLING
STRAIN GAGES
STRAIN RATE
STRAINS
STRESS ANALYSIS