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 journalArticlepeer-review

44 Citations (Scopus)
59 Downloads (Pure)


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 languageEnglish
Pages (from-to)3-11
Number of pages9
JournalInternational Journal of Mechanical Sciences
Early online date29 Oct 2014
Publication statusPublished - Feb 2015


  • drilling
  • impacts
  • elastic-plastic
  • indentation
  • rock


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