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Effect of lubricant degradation on the tribological performance of a wheel-rail system

Pérez de Brito, Andrey Fabio (2014) Effect of lubricant degradation on the tribological performance of a wheel-rail system. Maestría thesis, Universidad Nacional de Colombia - Sede Medellín.

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Abstrac: In this work lubricant degradation and its relationship with tribological behavior was studied. Commercial grease (Sintono Terra HLK) and three versions of a newly developed product (Tribolub) for the Metro system of Medellín city were studied. A twin-disc testing machine was used to evaluate the effect of degradation caused by either radiation or mechanical action on the tribological properties of the greases; also, a number of tests were carried out to learn about the changes in rheological properties of the greases. The results showed that tribological testing of degraded greases using a twin-disc machine and a subsequent viscometric analysis can be considered as a viable option to study performance of degraded greases used for wheel-rail systems. All the greases studied showed a decrease in their tribological performance after mechanical degradation in twin-disc testing machine, being the degraded Tribolub-3 the one that allowed obtaining lower values of friction coefficient and mass loss of the samples. Both mechanical and radiation-induced degradation led to a significant increase in the viscosity of the greases studied, especially for low shear rates. FTIR analyses showed that such response was mainly caused by chemical changes in the structure of the greases. Viscosity-time curves showed a rheopectic behavior at low shear rates for Sintono Terra HLK and one of the versions of Tribolub, which was related to the particle contents and the effect of thickeners. Wetting tests showed better wettability for Tribolub than for Sintono Terra HLK, both before and after degradation

Tipo de documento:Tesis/trabajos de grado - Thesis (Maestría)
Colaborador / Asesor:Toro Betancur, Alejandro
Información adicional:Maestría en Ingeniería - Materiales y Procesos
Palabras clave:Tribologia, Lubricación, Sistema rueda-carril, Desgaste de superficies
Temática:6 Tecnología (ciencias aplicadas) / Technology > 62 Ingeniería y operaciones afines / Engineering
Unidad administrativa:Sede Medellín > Facultad de Minas > Escuela de Ingeniería de Materiales
Código ID:46987
Enviado por : MenC Andrey Fabio Pérez de Brito
Enviado el día :10 Febrero 2015 11:38
Ultima modificación:10 Febrero 2015 11:38
Ultima modificación:10 Febrero 2015 11:38
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