Reference for citation: Evsin M. G., Skotnikova M. A., Tsvetkova G. V. Method for determining the rheological properties of greases using Brookfield rotational viscometer. Journal of Instrument Engineering. 2023. Vol. 66, N 9. P. 763—770 (in Russian). DOI: 10.17586/0021-3454-2023-66-9-763-770.

Abstract. A test procedure developed on a Brookfield rotational viscometer for determining and calculating the basic rheological properties of two-component grease substance containing a frame structure is presented, using the standard Litol 24 lubricant as an example. The measurements are performed using the geometry standard for liquid lubricants, near the surface of the spindle (inner cylinder with radius Ri), in a narrow volume of liquid lubricant with a gap value (Ra - Ri) where Ra is the radius of the boundary along which the destruction of the grease’s frames occurred and fluid flow is observed. A method is proposed for calculating the yield strength and dynamic viscosity of a grease containing a frame structure. The developed methodology is verified. New data are obtained on the rheological properties of plastic binders based on Litol, Solidol, and electrical grease with the addition of graphene, molybdenum and copper.

Keywords: rotary viscometer, greases, rheological properties, dynamic viscosity, yield stress, shear stress, shear rate

Acknowledgement: the research was supported by the Russian Science Foundation, grant no. 22-19-00178;https://rscf.ru/project/22-19-00178/.

References:

1. Evsin M.G., Skotnikova M.A. Journal of Instrument Engineering, 2020, no. 4(63), pp. 367–373, DOI: 10.17586/0021-3454-2020-63-4-367-373.
2. Evsin M.G., Skotnikova M.A. AIP Conference Proceedings, Melville, NY, 2021, vol. 2340, pp. 030006. DOI: 10.1063/5.0047384. ISBN: 978-0-7354-4084-5.
3. Medvedevа V.V., Breki A.D., Krylov N.A. et al. Proceedings of the Southwest State University. Series: Engineering and Technologies, 2016, no. 2(19), pp. 30–40. (in Russ.)
4. Medvedevа V.V., Breki A.D., Krylov N.A. et al. Proceedings of the Soutwest State University, 2016, no. 1(63), pp. 75–82. (in Russ.)
5. Medvedevа V.V., Skotnikova M.A., Breki A.D. et al. News of the Tula State University. Technical Sciences, 2015, no. 11-1, pp. 57–65. (in Russ.)
6. Czarny R., Paszkowski M. Journal of Synthetic Lubrication, 2007, no. 1(24), pp. 19–29. DOI: 10.1002/jsl.26.
7. Berezina E.V., Bogomolov M.V., Godlevsky V.A., Fomichev D.S. Bulletin of the Ufa State Aviation Technical University, 2012, no. 4(16), pp. 36–41. (in Russ.)
8. Volnyanko E.N., Tsarenko I.V. Bulletin of the Belarusian-Russian University, 2013, no. 4(41), pp. 17–24. (in Russ.)
9. Shilov M.A., Smirnova A.I., Gvozdev А.А. et al. Friction and Wear, 2020, no. 6(40), pp. 720–730. (in Russ.)
10. Berezina E.V., Korsakov M.N., Pavlov A.S. et al. Zhidkiye kristally i ikh prakticheskoye ispol'zovaniye (Liquid Crystals and Their Practical Use), 2010, no. 2, pp. 85–96. (in Russ.)
11. Ostrikov V.V., Sazonov S.N., Balabanov V.I., Safonov V.V. Petroleum Chemistry, 2017, no. 8(57), pp. 705–713.
12. Medvedevа V.V. St. Petersburg State Polytechnic University Journal of Engineering Science and Technology, 2017, no. 4(23), pp. 141–148, DOI: 10.18721/JEST.230414. (in Russ.)