text: In rolling element bearings fretting may occur when the bearings are operating in an oscillating motion. Examples of applications are blade bearings in wind turbines, helicopter rotor pitch bearings, and bearings in robots. If the bearing movement is limited to small motions the damage caused may be called fretting or false brinelling depending on mechanism encountered. The main difference is that false brinelling occurs under lubricated and fretting under dry contact conditions.  Between false brinelling and fretting corrosion, a time-dependent relation has been proposed.