An experimental study of the shear parameters of viscoelastic liquids is carried out by the acoustic resonance method based on the changes in the natural frequency and Q factor of a piezoelectric quartz resonator. The liquid to be studied is placed between a stationary quartz strap and the piezoelectric quartz crystal vibrating at the resonance frequency. For a set of drilling mud, the values of the real and imaginary shear module are obtained at a frequency of 74 kHz. The measurements are performed with a liquid layer thickness much smaller than the shear wavelength. It is shown that the shear modulus decreases with increasing strain amplitude. A hole-cluster model based on the IsakovichChaban nonlocal diffusion theory is proposed for explaining the low-frequency viscoelastic relaxation process.

The temperature dependencies of real and imaginary parts of complex shear modulus of liquids have been obtained. It has shown that both real shear modulus G' and ft imaginary shear modulus G" decrease with increasing temperature. The experiments havebeen carried out by resonance method at a shear oscillation frequency of 74 kHz. Liquids of viscosity 0.02 -0.03 Pa-s have been investigated.