Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Tribological and thermal behavior of wagon brake shoes sliding against wheel material
Submission Author:
Manuelle Curbani Romero , ES
Co-Authors:
Adler Armelini Furlan, Rubson Camporez, Manuelle Curbani Romero, Cherlio Scandian
Presenter: Adler Armelini Furlan
doi://10.26678/ABCM.COBEM2021.COB2021-2050
Abstract
Metal pickup (MPU) is a phenomenon commonly observed in braking systems of railway wagons. The sliding between the wheel and the brake shoe causing friction heating can often lead to the formation of an iron layer on the shoe surface reducing the friction coefficient and accelerating wear. This paper aims to investigate the effect of this metallic layer adhered to the surface of the brake shoe on the wear, friction and contact temperature of the shoes when sliding against the wheel. Pin-on-disc sliding wear tests were carried out in Plint TE67 tribometer. Pins made from brake shoes with and without adhered metallic film were tested with discs made from steel wheels. The contact temperature was measured during the test using an infrared thermographic camera. The metallic film was characterized by optical microscopy (OM) and microhardness. The identification of the different constituents of the shoe pads and its composition were obtaining using energy dispersive X-ray spectroscopy (EDX) and OM. Wear mechanisms were determined using OM. An analytical method for the calculation of contact temperature was developed using the test contact geometry. Experimental temperature results were compared to those obtained from the analytical method. The metallic film decreased the friction coefficient and affected contact temperature. The analytical model results presented a good agreement with the experimental values.
Keywords
brake shoe, sliding wear, contact temperature, wheel-rail contact, friction
