Heavy raw oil modules slowly vary in proportion to log of time. The recent research of complex shear module dependence on strain amplitude reveals log time increasing of nonlinear parameter for sample of raw oil. Experiments have been done at the rotation rheometer in the mode of small torsional oscillations. Experiment showed the complex shear module linearly decreases with amplitude of shear excitation increase and that could be if the value of shear module of the oil linearly varies with strain modulus. Results of the first three harmonics amplitudes analysis for visco-elastic response on both amplitude excitation and time are presented as well.
Russian state university of oil and gas by I.M. Gubkin, Physics chair. Russia, 119991, Moscow, Leninsky prosp., 65, build. 1
Science News of the Faculty of Physics, Lomonosov Moscow State University
This new information publication, which is intended to convey to the staff, students and graduate students, faculty colleagues and partners of the main achievements of scientists and scientific information on the events in the life of university physicists.