狠狠撸

lubrication wear society of automotive engineers (sae) friction social cost private costs marginal social cost externalities of energy internalization of externality tribology what is tribology definition of tribology importance of tribology history of tribology need of tribology productive friction hydrodynamic or thick film lubrication productive wear tribology for energy conservation tribology in energy efficiency benefits of tribology benefits of lubrication hydrostatic lubrication functions of lubricant types of lubrication types of friction boundary or thin film or greasy friction dry or solid friction hydrodynamic or thick film or viscous friction semi fluid or mixed friction kinetic friction static friction rolling friction sliding friction journal bearing types of wear adhesive wear abrasive wear fretting wear surface fatigue wear erosive wear externality & its types positive externality (external benefit) negative externality (external cost) social benefit of externality marginal private benefit marginal external benefit boundary or thin film lubrication classification of lubricants classification of lubricants by raw material classification of lubricants by usage classification of lubricants by viscosity solid lubricants liquid lubricants semi solid lubricants mineral oils crude oil petroleum oil grease graphite pbo mos2 synthetic oil vs mineral oil mineral oil vs synthetic oil advantages of synthetic oil break in period synthetic oils viscosity grades monograde oils multigrade oils viscosity grades advantages of multigrade over monograde oils elasto hydrodynamic lubrication mixed lubrication lubrication regimes stribeck curve properties of lubricants characteristics of good lubricant viscosity viscosity index flash point fire point cloud point pour point oiliness corrosion emulsification physical stability chemical stability neutralization number adhesiveness film strength specific gravity volatility viscosity vs temperature comparison between monograde and multigrade oils