潤滑油の粘性に及ぼす圧力,温度およびせん断速度の影響(<小特集>高圧力小特集)

概要

論文の詳細を見る
Viscosity changes of lubricating oils with regard to pressure (Max. 500 MPa), temperature (Max. 150℃) and shear rate (Max. 10^5sec^<-1>) were investigated by using a falling body type and a capillary type viscometers. The oils tested were mineral oils, animal and vegetable oils, oleic acid and polymer-blended mineral oil. The viscosities of animal and vegetable oils and oleic acid had similar dependencies on both pressure and temperature. The viscosity of an oil with a large pressure dependency also had a large temperature dependency. Both the pressure and temperature dependencies of viscosity became smaller as the temperature rose, and the temperature dependency of viscosity became greater as the pressure rose. The viscosity abruptly decreased beyond a critical shear rate, while it was nearly constant below the shear rate. The critical shear rate became smaller with an increase of pressure. By taking viscosity changes into account, the change of oil film thickness at roll bite in steel rolling was analyzed and discussed.
社団法人日本材料学会の論文
1984-02-15