Method of gauging pre-existing in-situ stress from an extracted

Details Method of gauging pre-existing in-situ stress from an extracted Method of gauging pre-existing in-situ stress from an extracted

1987-08-21

1990-04-24

Laroche, Eugene R.

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

73587, G01N 306

Patent

active

049189930

ABSTRACT:
Method and apparatus for determining a point of inflection in a evaluating maximum prior stresses to which a sample has been subject is accomplished by acoustical emission response from the sample versus the applied stress to the sample. The method comprises applying a compressive force to the sample in a manner which gradually and uniformly increases stress on the sample. Stress as applied to the sample is measured and simultaneously, cumulatively acoustic emission pulses are counted in response to the gradually increasing applied stress to the sample. In an X-Y co-ordinate system, the measured stress is plotted along one co-ordinate and the cumulative acoustic emission count supplied along the other co-ordinate to develop a curve having a recognizable point of inflection to indicate maximum prior stresses to which the sample had been previously subjected.

REFERENCES:
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patent: 3811734 (1975-10-01), Mehdizadeh
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patent: 4562736 (1986-01-01), Iwasaki et al.
Dunegan et al., "Acoustic Emission", Research/Development, May 1971, pp. 20-24.
Lord, Jr., et al., "Acoustic Emission Behavior . . . Bearing Capacity", Materials Evaluation, May 1976, pp. 103-108.
Koerner et al., "Acoustic Emission Behavior or Granular Soils", Journal of the Geotechnical Engineering Division, vol. 102, GT7, pp. 761-773, Jul. 1976.
Frederick, "Acoustic Emission as a Technique . . . Testing", Material Evaluation, Feb. 1970, pp. 43-47.
R. V. Williams' Article Entitled "Acoustic Emission", Published by Adam Hilger, Ltd., Bristol (1980), pp. 108-116.

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