Hertzian Contacts
Point contact
Elliptic contact
Line contact

Rolling with Traction
Point contact
Line contact

Elasto Hydrodynamic Lubrication
Elliptic contact
Line contact
Groove ball bearing

Contact temperature
Hertzian point contact

Components
Basic static load rating of
   groove ball bearings
Surface durability of spur gears

Failure analysis
Rail contacts
Gears
Roller bearings
Cam mechanisms