When fluids experience high pressure, such as one encountered by elastohydrodynamic (EHD) lubricants in ball bearings, their rheology may deviate from properties measured in ambient conditions. This may be due to pressure-induced glass transition, shear thinning and also thermal effects.  To better understand how fluids behave in EHD contacts and their origins, local rheological information is necessary. In our group, laser-based techniques are used to investigate local rheology of lubricants in point contacts.  Local rheological heterogeneity are detected. Depending on molecular structure of the liquids, and its pressure- and temperature-viscosity coefficients, shearing banning and shear thinning may occur. Several fluids are tested. It is hoped that through these experiments, a relationship between molecular structure, flow of lubricants and friction is established.<br/>

Local rheology of lubricants

253rd National Meeting (2017)

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