Abstract
Fretting fatigue is a phenomenon which occurs when two parts are contacted to each other and one of those parts or both are subjected to cyclic load. Fretting decreases fatigue life of materials drastically by half or even more. Therefore, investigation of fretting fatigue life of materials is an important subject. Fretting fatigue tests are usually per- formedusing universal hydraulic testing devices. Inthiswork, a rotating bending apparatus for fretting fatigue test is intro- duced in which the cyclic load is provided by an adjustable eccentric load. The apparatus called RBFF machine which is the abbreviation of rotating bending fretting fatigue. The eccentric load is measured by load cell. The coefficient of friction and fretting load are measured by foil strain gauges using a Wheatstone bridge configuration. The performance of the machine is verified with doing a comparison between fatigue lives of a number of AL7075-T6 alloy samples on a ShimadzurotatingbendingfatiguetestingmachineandRBFF. The results shows very close assent between the operations of the two testing rigs. The main privileges of RBFF are its simplicity with respect to universal devices, cheapness and, coefficient offriction(betweenpadsand specimen) evaluation duringthetest.TheRBFFalsohasthecapabilityofbeingused for any other soft and hard metals. It can be advanced further for high and low temperature.
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