Abstract
Pin-on-disc (PoD) testing is widely used to investigate the sliding behaviour of materials and relevant wear mechanisms under different tribological conditions. The approach has been also profitably applied to the characterization of materials for brake systems to obtain specific information on the wear mechanisms. In the present study, the transient thermal analysis of a pin made with a friction material dry sliding against HVOF coated and uncoated pearlitic cast iron disc in a PoD apparatus was investigated by means of a finite element analysis together with experimental measurements. The aim of the investigation was to model the surface contact temperature in this sliding system to highlight the role of the different surface conditions, i.e., coated and uncoated, on the evolution of the pin and disc temperatures during sliding. In addition, we propose a simplified analytical equation for estimating the average temperature rise in the contact region during sliding, by extending the Kennedy approach in order to be able to provide a quick evaluation of the contact temperature for this kind of couplings, what is very helpful when characterizing a large number of systems in different contact conditions.
Highlights
Pin-on-disc (PoD) tribological tests are commonly used to investigate the wear behaviour of materials in contact with a sliding motion
The transient thermal analysis of a pin made with a friction material dry sliding against high-velocity oxygen-fuel (HVOF) coated and uncoated pearlitic cast iron disc in a PoD apparatus was investigated by means of a finite element analysis together with experimental measurements
We propose a simplified analytical equation for estimating the average temperature rise in the contact region during sliding, by extending the Kennedy approach in order to be able to provide a quick evaluation of the contact temperature for this kind of couplings, what is very helpful when characterizing a large number of systems in different contact conditions
Summary
Pin-on-disc (PoD) tribological tests are commonly used to investigate the wear behaviour of materials in contact with a sliding motion. Several studies report on the PoD results, concerning investigations on materials for vehicular brake systems for different transportation fields, like road vehicles [3,4,5,6,7] and trains [8, 9]. As automotive brakes are concerned, pads are made of friction materials, comprising a large number of organic and inorganic components, pressed against a rotating disc, typically made of pearlitic cast iron [10]. Plain PoD testing is very useful to obtain focused information on the wear mechanisms and on their role on the tribological behaviour of real systems [6, 7, 11,12,13,14]. Considering the complexity of the formulation of friction materials for brake pads, it is paramount to have a reliable selection tool for the development of novel compositions [10, 15]
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