Acoustic measurement of the shear compliance of silicone oil

A method of measurement is described and the results of measurement of the modulus limit shear compliance J∞, of four samples of synthetic oil with different molecular weight compared. Oil properties have been measured acoustically by determining the characteristic shear resistance at a stress fre-quency of 30 MHz and 450 MHz and in the temperature range from 0°C to —100°C.
It was found that the increase of molecular weight has only little influence on the limit of the modulus of shear compliance of the liquid.