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    • Keywords


      Tribometer; granite; shaly sandstone; state variable; stick-slip friction.

    • Abstract


      Understanding the fundamental issues related with the effect of shear velocity on frictional characteristics at the interface of rock surfaces is an important issue. In this paper, strain-rate dependence on friction is investigated in relation to sliding behaviour under normal load. The phenomenon of stick-slip of granite and shaly sandstone with a tribometer at constant rate of strain under normal loads was observed.

      Friction at the interface of the rock samples was developed by increasing shear strain at a constant rate by applying constant velocity using the tribometer. For shaly sandstone, state parameters (𝑎 and 𝑏) played a major role in determining the friction values and roughness of the contact surfaces as well. Higher values of 𝑏 for shaly sandstone may be attributed to the fact that its surface had a greater number of pronounced asperities. Rubbing between the surfaces does not mean that surface becomes smoother. This is because of variation of friction between surfaces.

    • Author Affiliations


      T N Singh1 A K Verma2 Tanmay Kumar3 Avi Dutt3

      1. Department of Earth Sciences, Indian Institute of Technology, Powai, Mumbai 400 056, India.
      2. CeRES, The Energy and Resources Institute, Darbari Seth Block, IHC Complex, Lodhi Road, New Delhi 110 003, India.
      3. Institute of Technology, Banaras Hindu University, Varanasi 221 005, India.
    • Dates

  • Journal of Earth System Science | News

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      Posted on July 25, 2019

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