Abstract
The rheological properties of solidified oils including Daphne 7373 and 7474 under high pressure up to 5 GPa were evaluated by observing the large plastic deformation of metal microspheres due to nonhydrostatic pressurization in these oils using a diamond-anvil pressure cell. The solidification pressures determined by the onset pressures of deformation for aluminum microspheres are about 0.6 GPa for traction oils, 1.2 GPa for mineral oils, and 1.79 GPa for Daphne 7373 at 24 °C. Microsphere deformation for Daphne 7474 was not observed up to 3.51 GPa. Shear stresses of the solidified oils were estimated from the deformed Cu microspheres, treating them as stress sensors based on several assumptions.
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