Journal of Mining Science

, Volume 52, Issue 5, pp 906–912 | Cite as

Mechanical properties of coal microcomponents under continuous indentation

  • E. L. Kossovich
  • N. N. Dobryakova
  • S. A. Epshtein
  • D. S. Belov
Rock Failure


The article reports data on continuous indentation of different rank black coal and anthracite. The test specimens are specially prepared, and their faces are differently oriented relative to their bedding planes. Different mechanical behavior of coal and anthracite microcomponents in different planes relative to bedding is identified, and relevant values of elasticity modulus and hardness are determined. The measurements exhibit spatial anisotropy of microlevel mechanical properties of vitrinite and inertinite.


Coal vitrinite inertinite microcomponents continuous indentation mechanical properties elasticity modulus hardness anisotropy 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Lomtadze, V.D., Fiziko-mekhanicheskie svoistva gornykh porod. Metody laboratornykh issledovanii (Physico-Mechanical Properties of Coal. Laboratory Research Techniques), Leningrad: Nedra, 1990.Google Scholar
  2. 2.
    Gonzatti, C., Zorzi, L., Agostini, I.M., Fiorentini, J.A., Viero, A.P., and Philipp, R.P, In Situ Strength of Coal Bed Based on the Size Effect Study on the Uniaxial Compressive Strength, Int. J. Mining Sci. and Technology, 2014, vol. 24(6), pp. 747–754.CrossRefGoogle Scholar
  3. 3.
    West, R.D., Markevicius, G., Malhotra, V.M., and Hofer, S, Variations in the Mechanical Behavior of Illinois Bituminous Coals, Fuel, 2012, vol. 98, pp. 213–217.CrossRefGoogle Scholar
  4. 4.
    Zhong, S., Baitalow, F., Nikrityuk, P., Gutte, H., and Meyer, B, The Effect of Particle Size on the Strength Parameters of German Brown Coal and Its Chars, Fuel, 2014, vol. 125, pp. 200–205.CrossRefGoogle Scholar
  5. 5.
    Zhang, Z., Zhang, R., Li, G., Li, H., and Liu, J, The Effect of Bedding Structure on Mechanical Property of Coal, Advances in Materials Science and Engineering, 2014, vol. 2014, pp. 1–7.Google Scholar
  6. 6.
    Proskuryakov, N.M., Upravlenie sostoyaniem massiva gornykh porod (Rock Mass State Control), Moscow: Nedra, 1991.Google Scholar
  7. 7.
    Kožušníková, A, Determination of Microhardness and Elastic Modulus of Coal Components by Using Indentation Method, GeoLines, 2009, vol. 22, pp. 40–43.Google Scholar
  8. 8.
    Manjunath, G.L. and Nair, R.R, Implications of the 3D Micro Scale Coal Characteristics along with Raman Stress Mapping of the Scratch Tracks, Int. J. of Coal Geology, 2015, vol. 141, pp. 13–22.CrossRefGoogle Scholar
  9. 9.
    Epshtein, S.A., Borodich, F.M., and Bull, S.J, Evaluation of Elastic Modulus and Hardness of Highly Inhomogeneous Materials by Nanoindentation, Applied Physics A, 2015, vol. 119(1), pp. 325–335.CrossRefGoogle Scholar
  10. 10.
    Borodich, F.M., Bull, S.J., and Epshtein, S.A, Nanoindentation in Studying Mechanical Properties of Heterogeneous Materials, J. of Min. Sci., 2016, vol. 51(3), pp. 470–476.CrossRefGoogle Scholar
  11. 11.
    Kalei, G.N, Some Test Data on Microhardness Determined by the Indent Depth, Mashinoved., 1968, no. 3, pp. 105–107.Google Scholar
  12. 12.
    Bulychev, S.I., Alekhin, V.P., Shorshorov, M.Kh., Ternovsky, A.P., and Shnyrev, G.D, Determination of Young’s Modulus Based on the Indentation Diagram, Zavod. Lab., 1975, no. 9, pp. 1137–1140.Google Scholar
  13. 13.
    Oliver, C. and Pharr, M, An Improved Technique for Determining Hardness and Elastic Modulus Using Load and Displacement Sensing Indentation Experiments, J. of Materials Research, 1992, vol. 7(11), pp. 1564–1583.CrossRefGoogle Scholar
  14. 14.
    Cheng, Y.-T. and Cheng, C.-M., Scaling Relationships in Conical Indentation of Elastic-Perfectly Plastic Solids, Int. J. of Solids and Structures, 1999, vol. 36(8), pp. 1231–1243.CrossRefGoogle Scholar

Copyright information

© Pleiades Publishing, Ltd. 2016

Authors and Affiliations

  • E. L. Kossovich
    • 1
  • N. N. Dobryakova
    • 1
  • S. A. Epshtein
    • 1
  • D. S. Belov
    • 1
  1. 1.National University of Science and Technology—MISISMoscowRussia

Personalised recommendations