Experimental studies of the resultant contact forces in drillbit-rock interaction

Olusegun Kolawole Ajibose; Marian Wiercigroch; Alfred Rotimi Akisanya

doi:10.1016/j.ijmecsci.2014.10.007

Experimental studies of the resultant contact forces in drillbit-rock interaction

Olusegun Kolawole Ajibose^* (Corresponding Author), Marian Wiercigroch, Alfred Rotimi Akisanya

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

The understanding of drillbit–rock interaction is essential to the optimisation of the percussive drilling technology. It is obvious that rock fragments mainly as a result of the contact forces developed during impacts. In addition, the modelling of the dynamic response of a drilling module is possible if the contact law can be described in terms of the force and penetration. In this paper, the resultant contact force versus penetration is examined for a drillbit with conical and spherical inserts in contact with a rock. Quasi-static indentation and dynamic impact experiments are conducted on sandstone, granite and basalt. A power-law relationship is obtained between the measured resultant contact force and the penetration. The relationship is in good agreement with existing theoretical results for elastic-ideally plastic solids.

Original language	English
Pages (from-to)	3-11
Number of pages	9
Journal	International Journal of Mechanical Sciences
Volume	91
Early online date	29 Oct 2014
DOIs	https://doi.org/10.1016/j.ijmecsci.2014.10.007
Publication status	Published - Feb 2015

Keywords

drilling
impacts
elastic-plastic
indentation
rock

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Ajibose, Wiercigroch and Akisanya (2014)
NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Mechanical Sciences. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Mechanical Sciences VOL 91, 2015 DOI 10.1016/j.ijmecsci.2014.10.007 © <year>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Accepted author manuscript, 3.14 MBLicence: CC BY-NC-ND

Alfred Akisanya
- Engineering, National Decommissioning Centre
- Engineering, Engineering - Personal Chair
- Engineering, Centre for Micro- and Nanomechanics (CEMINACS)
Person: Academic

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title = "Experimental studies of the resultant contact forces in drillbit-rock interaction",

abstract = "The understanding of drillbit–rock interaction is essential to the optimisation of the percussive drilling technology. It is obvious that rock fragments mainly as a result of the contact forces developed during impacts. In addition, the modelling of the dynamic response of a drilling module is possible if the contact law can be described in terms of the force and penetration. In this paper, the resultant contact force versus penetration is examined for a drillbit with conical and spherical inserts in contact with a rock. Quasi-static indentation and dynamic impact experiments are conducted on sandstone, granite and basalt. A power-law relationship is obtained between the measured resultant contact force and the penetration. The relationship is in good agreement with existing theoretical results for elastic-ideally plastic solids.",

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AU - Akisanya, Alfred Rotimi

PY - 2015/2

Y1 - 2015/2

N2 - The understanding of drillbit–rock interaction is essential to the optimisation of the percussive drilling technology. It is obvious that rock fragments mainly as a result of the contact forces developed during impacts. In addition, the modelling of the dynamic response of a drilling module is possible if the contact law can be described in terms of the force and penetration. In this paper, the resultant contact force versus penetration is examined for a drillbit with conical and spherical inserts in contact with a rock. Quasi-static indentation and dynamic impact experiments are conducted on sandstone, granite and basalt. A power-law relationship is obtained between the measured resultant contact force and the penetration. The relationship is in good agreement with existing theoretical results for elastic-ideally plastic solids.

AB - The understanding of drillbit–rock interaction is essential to the optimisation of the percussive drilling technology. It is obvious that rock fragments mainly as a result of the contact forces developed during impacts. In addition, the modelling of the dynamic response of a drilling module is possible if the contact law can be described in terms of the force and penetration. In this paper, the resultant contact force versus penetration is examined for a drillbit with conical and spherical inserts in contact with a rock. Quasi-static indentation and dynamic impact experiments are conducted on sandstone, granite and basalt. A power-law relationship is obtained between the measured resultant contact force and the penetration. The relationship is in good agreement with existing theoretical results for elastic-ideally plastic solids.

KW - drilling

KW - impacts

KW - elastic-plastic

KW - indentation

KW - rock

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DO - 10.1016/j.ijmecsci.2014.10.007

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JO - International Journal of Mechanical Sciences

JF - International Journal of Mechanical Sciences

ER -

Experimental studies of the resultant contact forces in drillbit-rock interaction

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Keywords

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Alfred Akisanya

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