Experimental Study on the Expended Energy on Structural Degradation of Lubricating Greases

Abstract One of the keystones tribological studies is energetical approach to lubrication process. In particular case lubricating greases, part process's energy dissipates due a shear-induced structural rearrangement 3D network thickening agent dispersed in base oil. This fact confers them consistency, mechanical stability, rheological and behaviour. this research work, we investigate degradation induced by shear stress applied tests (rotational oscillation mode) influence thickener (type composition) oil on both process expended energies. For purpose, lithium, calcium polyurea-based greases NLGI grade 2 were used. These have been manufactured with different (mineral, synthetic vegetable oils) kinematic viscosity 48 or 240 mm /s. Some biogenic also included research. The optical microscopy analysis revealed particles-based agglomerates shapes sizes that reduced notably, if not almost completely destroyed, after stress. Due distribution, significant differences frictional inside bulk grease during detected. size depended content type