Behavior under contact loading of surface asperities obtained by turning

Abstract

The quality of metallic surfaces is described by the physicmechanical and chemical state (microhardness, microstructure) and geometrical state. Contact interaction between two solid bodies has a very important role in many physical phenomena and engineering applications. The main idea of the research was to experimentally study the behavior at pressure of a surface obtained by turning. For this experiment, cylindrical parts made of aluminum were used. The test samples were obtained by turning using tools having distinct corner radius and distinct feeding rates. Experimental method was applied in order to evaluate and model the influence exerted by some input factors (force, turning tool corner radius, machining feed) on the Ra surface roughness parameter. By using the data obtained after the experimental tests, an empirical mathematical model able to describe the evolution of the roughness under pressure contact was determined.