Method for determining the rheological properties of greases using Brookfield rotational viscometer
https://doi.org/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
Supporting agencies: the research was supported by the Russian Science Foundation, grant no. 22-1900178;https://rscf.ru/project/22-19-00178/.
About the Authors
M. G. Evsin
Peter the Great St. Petersburg Polytechnic University
Russian Federation
Russian Federation
Mark G. Evsin - Post-Graduate Student; Institute of Mechanical Engineering, Materials and Transport
St. Petersburg
M. A. Skotnikova
Peter the Great St. Petersburg Polytechnic University
Russian Federation
Russian Federation
Margarita A. Skotnikova -Dr. Sci., Professor; Institute of Mechanical Engineering, Materials and Transport, International Scientific and Educational Center "BaltTribo-Polytechnic"
St. Petersburg
G. V. Tsvetkova
Peter the Great St. Petersburg Polytechnic University
Russian Federation
Russian Federation
Galina V. Tsvetkova - PhD, Associate Professor; Institute of Mechanical Engineering, Materials and Transport, International Scientific and Educational Center "BaltTribo-Polytechnic"
St. Petersburg
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Review
For citations:
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;66(9):763-770. (In Russ.) https://doi.org/10.17586/0021-3454-2023-66-9-763-770
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