Investigating the tribological properties under severe contact conditions using an extreme pressure tribo-device

The tribological mechanisms under severe plastic deformation processes are still not fully understood. For that purpose, an extreme pressure tribo-device (EPTD) is designed using line-contact mechanism to better understand the contact under different sliding speeds and normal forces. The aim of this research is to simulate the contact conditions found on the tool-chip interface in metal cutting, with a focus on the friction behavior under different speeds and normal forces. The results reveal that the friction coefficient decreases with an increase of sliding speed and normal force for C45 steel. Wear analysis results reveal that wear resistance increases as sliding speed decreases. Finite Element Method (FEM) models have been developed to identify and validate the parameters around the contact zone. The FEM results reveal the presence of a sticking and a sliding region similar to that of real cutting conditions. The results enable a better understanding of the tribological behavior in severe plastic deformation applications by providing accurate tribological data. The results can also serve to assess new tool coatings and lubricants used under high-pressure contact.