Resumo

SILVA, W. M. da  e  MELLO, J. D. B. de. Simulação de desgaste abrasivo via eventos múltiplos. C.Tecn. Mat. [online]. 2006, vol.18, n.1-2, pp.49-56. ISSN 0870-8312.

The optimisation of the abrasive process is the constant aim of scientific studies, either to minimize the mass lost of any tribological system submitted to abrasive presence, or to improve the superficial quality in the machining and/or finishing processes which use abrasives to remove materials. Recently, the wear system has been classified in two different groups, according to its particle dynamic: (a) sliding of the acting particles on the sample surface producing the mechanism of microcutting and/or microploughing or microcracking; (b) the rolling of the abrasives between the surfaces leading to multiple indentation formation. Predominance of one or the other dynamic is due to system features, especially the force by particle, abrasive particle geometry and hardness ratio between the surfaces. The present work proposes a methodology that shows the principal parameters of laboratory abrasive wear tests by instrumented simulation. The equipment used in this simulation is a rectilinear esclerometer that reproduces the act of one abrasive particle on a sample surface. By an original wear surface analysis, a sequence of indentations and scratchs/grooves in random positions inside a pre-defined area can be obtained. It is possible to dimension the quantity, intensity and direction (in case of scratch) of the events. A surface similar to the original can be obtained by simulation. The wear mechanism and topography of this new surface can be described using laser interferometry and SEM. It can also be observed that the simulation is sensible to the direction of events and wear.

Palavras-chave : abrasive wear; wear mechanisms; simulation; multiply events.

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