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A common cause for premature bearing failures in wind turbine gearboxes are the so-called White Etching Cracks (WEC). These undirected, three-dimensional cracks are bordered by regions of altered microstructure and ultimately lead to a cracking or spalling of the raceway. An accelerated WEC test was carried out on a FE8 test rig using cylindrical roller thrust bearings made of martensitic 100Cr6 steel...
Visual erosion examples based on that occurred in the minerals and oil and gas industries are illustrated by a paint modeling technique. The visual paint patterns were used to illustrate erosion damage “hot spots”. This provided an insight into the underlining fluid dynamics process involved with erosion damages. This insight allows design changes to be made to reduce erosion, illustrated by examples...
To date, prediction of particulate erosion in suspension ows has been unreliable, with the state-of-the-art reporting errors upwards of 40% [Zhang et al., Wear 240 (2000) 40–51]. These errors stem chiefly from the underlying erosion models, significantly hindering understanding of erosion dynamics in suspension ows and design of plant equipment with improved erosion characteristics. Herein we present...
Development and validation of improved erosion models demands accurate, high resolution measurement techniques to quantify the distribution of erosion over large-scale and/or complex geometries. However, current sophisticated geometric scanning equipment is mostly used to examine small-scale erosion scars, and such techniques are not applicable when researching the erosion of complex or large-scale...
The goal of this work was to rank, as quantitatively as possible, the high-temperature scuffing characteristics of a series of Co-based materials, including coatings, for possible use in wear-critical components like those in diesel engine exhaust systems and emission-controls. A cylinder pivoting on its side against a flat tile was used as the testing geometry. All tests were performed at 600°C in...
A multilayer paint modelling study was conducted to investigate the erosion properties of different types of paints. The experiments were carried out in a slurry-mixing tank in which 10 painted samples mounted on a shaft were rotated at constant speed for a certain interval of time. The effect of impact angle on the particular type of paint was investigated by orientating the samples consecutively...
Kevlar pulp reinforced epoxy composites were prepared by compression molding. The friction and wear behavior of Kevlar pulp reinforced epoxy composites against stainless steel under dry sliding and water lubricated conditions was comparatively evaluated on an M-2000 friction and wear tester. The effects of Kevlar pulp content on tribological properties of the composites were investigated. The worn...
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