C.C. Viáfara

Industrial University of Santander | UIS · School of Metallurgical Engineering and Materials Science

The main objective of this work was to develop a novel computational strategy that is able to predict wear regime operation in worn surfaces. The image data were taken from worn surfaces images of cast iron specimens subjected to abrasion wear tests. These images were classified into two groups, identified with the severe and mild labels, according...

Belt conveyors are currently one of the most commonly used technologies for transporting iron ore. Of the components of the conveyor system, the belt is the most expensive and susceptible to damage. Failures due to wear of the rubber cover lead to downtime for corrective maintenance, greater operational risks and performance and economic losses. To...

Resumen-Este trabajo describe una estrategia educativa aplicada en el programa de Ingeniería Metalúrgica de la Universidad Industrial de Santander, que consiste en desarrollar proyectos de colaborativos con la industria. En esta estrategia los estudiantes aplican los conocimientos teóricos impartidos en la universidad y contribuyen a la solución de...

The main objective of this work was to develop a novel computational strategy that is able to predict wear regime operation in worn surfaces. The image data were taken from worn surfaces images of cast iron specimens subjected to abrasion wear tests. These images were classified into two groups, identified with the severe and mild labels, according...

Electrochemical characterization of wear metallic particles produced during pin-on-disc sliding tests is not conventionally carried out, possibly because of their small grain size, irregular shape and heterogeneous composition. The characterization of its reactivity can be important in the study of the relationship between oxidative and mechanical...

In this work, a cutting tool with premature wear was characterized by Rockwell hardness test, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). In addition, electrochemical impedance spectroscopy (EIS) measurements were carried out in order to investigate the characteristic properties of the wear coating (TiAlN) of...

This paper aims to investigate the effect of varying the hardness of both sliding bodies on the operating wear regime. Unlubricated sliding wear tests were performed using a pin-on-disc configuration. The friction coefficient was monitored during the wear tests, and the variation of mass loss of bodies as a function of sliding distance was obtained...

This work analyzes possible mechanisms causing the T1 wear regime transition, which was observed in a previous work varying the hardness of both sliding bodies. A pin-on-disk configuration was used to perform the unlubricated sliding wear tests. Low alloy and tool steels were employed as pin and disk materials, respectively. A normal load of 35N an...

In this paper, a review of the thermodynamic approaches of sliding wear is presented. These approaches are divided into the friction energy dissipation, the energy balance and the entropy production. A concise and critic account of the approaches is discussed, remarking their relative strength and weakness in explaining the phenomena occurring in t...

Wear behavior of coatings has usually been described in terms of mechanical properties such as hardness (H) and effective elastic modulus (E*). Alternatively, an energy approach appears as a promising analysis taking into account the influence of those properties. In a nanoindentation test, the dissipated energy depends not only on the hardness and...

In the unlubricated sliding wear of steels the mild-severe and severe–mild wear transitions have long been investigated. The effect of system inputs such as normal load, sliding speed, environment humidity and temperature, material properties, among others, on those transitions have also been studied. Although transitions seem to be caused by micro...

Resumo Neste trabalho é realizada uma caracterização do comportamento tribológico de materiais utilizados em aplicações offshore. Os pares estudados foram aço duplex contra aço duplex, o polietileno de alta densidade (PEAD) contra aço duplex (AD) e contra aço galvanizado (AG). Os ensaios de desgaste foram do tipo deslizamento alternativo, com as co...

Resumo: Este trabalho apresenta uma revisão bibliográfica dos objetivos educacionais visando sua aplicação no ensino da engenharia. Inicialmente se abordam alguns conceitos básicos dos objetivos educacionais como é sua definição e metodologia para serem escritos. Por outro lado, realiza-se uma breve descrição da taxonomia dos objetivos educacionais...

Sliding wear has a great influence on the performance of rail–wheel systems, especially because the wheel flange slides over the rail in a curve track. Since rail–wheel sliding introduces adhesive effects, high slip ratios strongly affect the rolling contact fatigue wear acting on the surfaces. Sliding wear tests were carried out in a pin-on-disk d...

Algunas aleaciones Fe-C presentan una excelente combinación de tenacidad y resistencia mecánica, asociada a los productos de la reacción bainítica, que las hace útiles en la fabricación de componentes de máquinas sometidos a altos esfuerzos. Sin embargo, en nuestro medio el conocimiento de esta transformación es reducido; esto hace difícil la compe...

En este trabajo, se realiza un análisis del efecto del uso del gas natural sobre el incremento en la temperatura de operación de un motor de encendido provocado (MEP) en modo bicombustible. Para tal fin se ha tomado como ejemplo el análisis de falla de una válvula de escape, de un motor convertido de gasolina a GNC, para determinar la influencia de...

El desgaste por deslizamiento tiene una gran influencia sobre el desempeño de los sistemas rueda-riel, en particular, por el deslizamiento de la pestaña de la rueda sobre la parte interna del riel en una pista curva. Dado que el deslizamiento entre la rueda y el riel involucra efectos de adhesión, altos porcentajes de deslizamiento/rodadura afectan...

Some alloys Fe-C have an excellent combination of toughness and strength, related to bainitic reaction products, being useful in manufacturing of machine components subjected to high stresses. However, in our medium the knowledge of this transformation is reduced; it makes difficult a competition of industrial sector in the global economy. In this...