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Influence of Penetration Rate and Indenter Diameter in Strength Measurement by Indentation Testing on Small Rock Specimen
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- Author(s) / Creator(s)
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Indentation testing has been developed as an unconventional method to determine intact rock strength using
small rock specimens within the size of drill cuttings. In previous investigations involving indentation testing,
researchers have used different indenter stylus geometries, penetration rates and specimen sizes. These
dissimilarities can restrict applications of this method for strength measurement and lead to non-comparable
results. This paper investigates the influence of indenter diameter and penetration rate on indentation indices for
carbonate rocks to provide objective comparison and application of the existing correlations.
As part of this research, several indentation tests were conducted using different indenter diameters and
penetration rates. The laboratory test results showed that indentation indices can be affected by the indenter
diameter while the penetration rate has only minor effect on the indentation indices. Thus, a normalizing
function was presented to reduce the dependency of test results to indenter diameter. Verification of the findings
with independent data confirms the suitability of the suggested normalizing function in determining the rock
UCS using testing data obtained from various indenter diameters and penetration rates. -
- Date created
- 2015-01-01
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- Type of Item
- Article (Draft / Submitted)