Abstract
Earlier we discovered the slow evolution of viscoelastic moduli of heavy crude oil. The shear modulus was measured at frequencies of 0.5, 5, and 50 Hz at different temperatures over 72 h. New studies of the dependence of the complex shear modulus on the strain amplitude revealed a logarithmic increase in the nonlinearity parameter as a function of time for this oil sample. It was experimentally established that the complex shear modulus is a linear function of the amplitude of shear perturbations. This is possible in the case of a linear dependence of values of the viscoelastic characteristics on the medium modulus of deformation.
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Original Russian Text © I.B. Esipov, O.M. Zozulya, M.A. Mironov, 2014, published in Akusticheskii Zhurnal, 2014, Vol. 60, No. 2, pp. 166–172.
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Esipov, I.B., Zozulya, O.M. & Mironov, M.A. Slow nonlinearity kinetics of the viscoelastic properties of oil during shear vibrations. Acoust. Phys. 60, 169–174 (2014). https://doi.org/10.1134/S1063771014020031
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DOI: https://doi.org/10.1134/S1063771014020031