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

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

Research output: Contribution to journalArticle

25 Citations (Scopus)
53 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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