Oscillating Tangential Forces on Cylindrical Specimens in Contact at Displacements within the Region of No Gross Slip

Abstract

The effects of oscillating tangential forces on cylindrical specimens at relative displacements within the no-gross-slip region have been studied experimentally. It is shown that within the no-gross-slip region there is a well-defined region at the onset of tangential displacement within which a primarily elastic deformation is indicated. Energy dissipation studies indicate that in this region the behavior is essentially visco-elastic, confirming the results of published work. This “limit of elastic behavior” has been found and measured for a number of metallic and non-metallic materials including diamond and plastics. At amplitudes below this limit no discernable wear is observed, even after millions of cycles of rubbing. However, at larger amplitudes, wear is rapid and characteristic of fretting corrosion, especially above the gross slip amplitude. Values of elastic tangential compliance at the limit of elastic behavior are determined which are in agreement with published theoretical work.