Summary
This paper is concerned with the theoretical and experimental study of a fluid with yield stress. The viscometric motion of SKF-LGMT Li 3/04 grease in a cone-cone (plate) configuration is studied. A procedure for the determination of the upper and lower shear yield stress is layed down. The material behaviour of the sample is modelled as a Maxwell fluid exhibiting yield stress; therefore, three material constants must be experimentally determined: the yield stress τ0, the viscosity coefficientη 0, and the relaxation time λ1. An analytical solution for the velocity distribution of this fluid in the cone-cone creep motion is obtained and, consequently, the real strain rate and the viscosity function are computed.
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Balan, C., Hutter, K. A procedure to determine the material constants and the viscosity function for a fluid with yield shear stress. Acta Mechanica 109, 65–78 (1995). https://doi.org/10.1007/BF01176817
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DOI: https://doi.org/10.1007/BF01176817