潤滑油の高圧力レーザ光散乱測定と力学特性評価 : 第3報, ブリルアン散乱による横弾性係数, 屈折率および動的密度の評価

概要

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In the present study, shear modulus, refractive index, and dynamic density of the order of GHz frequency were evaluated by measuring Brillouin scattering light under high pressure, employing a diamond-anvil high-pressure cell and a laser light scattering optical system improved on the previous one. The sound velocity on transverse mode and shear modulus were obtained for polyphenylether up to 4 GPa. The slope change in pressure-sound velocity diagram was confirmed at about 0.3 GPa. The change of refractive index became small with pressure and reached to a constant value at 3 GPa for both polyalphaorefine and tar naphthenic oil. The dynamic density was obtained from Brillouin scattering for several synthetic oils. The density change by pressure for naphthenic oils and polyphenylether was a half smaller than static one and its difference decreased with raising temperature. Application of a viscoelastic model with a bulk viscosity for these features was attempted.
一般社団法人日本機械学会の論文
1998-07-25