応力緩和による潤滑油の高圧力粘弾性測定法

抄録

A new technique to obtain viscoelastic property of lubricants under high pressure over 2 GPa is proposed. Tested lubricants are BCCM and DMP, which have high viscosity-pressure coefficients. From the difference of the ruby fluorescence wavelength between (0001) and 112^^-0) ruby plate in diamond-anvil apparatus, shear stress relaxation can be observed. By applying Maxwell model for the relaxation analysis, the extremely high viscosity (over 10¹⁵Pa·s) is obtained and is almost fitted with the extrapolated value of the existed one. Bulk viscosity and elastic modulus are also obtained and are consistent with the existing values.