Effects of sliding conditions on wear by repeated contact of two asperities

The effects of sliding conditions on wear of ductile metals under repeated sliding of two diamond pyramidal asperities along close tracks were studied using a dual-pin/disk test rig. Experiments under lubrication conditions were performed by using additive-free mineral oil H150 as lubricating oil. With repeated sliding of two asperities against disks made of aluminum and copper, unlike the repeated sliding of one asperity, wear proceeded by the repeated plastic deformation of the central ridge between grooves. The depth of grooves was smaller at a narrower distance between them, but the amount of wear increased. In the case of using disks made of brass, wear proceeded by cutting actions that remove material from the groove surface, and no substantial differences were observed in the behavior with the sliding experiments using one asperity and with those performed using two asperities. In this case, the depth of grooves increased with increasing number of sliding cycles and accordingly, the amount of wear continued to increase.