Abstract
Lateral-deformation measurements are important in rock-mechanics testing, both for providing material-behavior information and for acting as a control variable in servo-controlled experiments designed to obtain post-failure stress-strain curves. A gage for making these measurements must be compact, have a large linear range, and for tests on anisotropic rock, be able to monitor a discrete sample diameter. A gage which employs a strain-gaged sensing disk is described which meets all of these requirements.
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Abbreviations
- δ:
-
change in the sample diameter
- y :
-
beam-tip deflection
- m :
-
adjusting-screw length
- α:
-
beam-tip slope
- L :
-
beam length
- D :
-
sample diameter
- D o :
-
initial sample diameter
- R :
-
radius of curvature of the deformed disk
- S :
-
are length
- h :
-
height of adjusting screw above disk
- θ:
-
angle of rotation of post
- ε:
-
strain at top surface of the disk
- C :
-
one half the thickness of the disk
- P :
-
load applied on the sample by the adjusting screw
- W :
-
width of the disk
- E :
-
modulus of disk material
References
Walsh, J.B. and Brace, W.F., “Mechanics of Rock Deformation,” Rock Mechanics Symposium, ASME, New York, NY (1973).
Hudson, J.A., Brown, E.T. andFairhurst, C., “Optimizing the Control of Rock Failure in Servo-Controlled Laboratory Tests,”Rock Mech.,3,217–224 (1971).
Schmidt, R.A. and Schuler, K.W., “Mechanical Properties of Oil Shale from Anvil Point Under Conditions of Uniaxial Compression,” Sandia Lab. Report, SAND 74-0035 (1974).
Wawersik, W.R., “Technique and Apparatus for Strain Measurements on Rock in Constant Confining Pressure Experiments,”Rock Mech.,7,231–242 (1975).
Schock, R.N. andDuba, A.G., “Pressure Effects on the Response of Foil Strain Gages,”Experimental Mechanics,13 (1),43–44 (Jan. 1973).
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This paper was sponsored by the U.S. Department of Energy under Contract AT(29-1)-789.
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Schuler, K.W. Lateral-deformation gage for rock-mechanics testing. Experimental Mechanics 18, 477–480 (1978). https://doi.org/10.1007/BF02324284
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DOI: https://doi.org/10.1007/BF02324284