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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...
To determine the wear resistance of journal bearings (JB′s) under lubricated condition, this paper aims to provide an alternative method using an adapted TE-66 micro-scale abrasion tester which was adapted to generate accelerated lubricated wear on actual JB′s. Two actual JB′s with different coatings were investigated. The load (in the range 1–3N) and sliding distance (in the range 39.9–797.7m) were...
Leaded tin bronze alloys are widely used in heavy machinery bearings operating in boundary and mixed lubrication regions due to the excellent dry lubrication properties of lead. However, restrictions on the use of lead have created an increasing demand for lead-free or low-lead bearing materials. In the present study, suitability of a novel bismuth bronze bimetal material for possible substitution...
Rolling elements made of 52100 steel were subjected to high austenitizing temperatures to embrittle the steel. The embrittled rolling elements were intentionally given a rougher surface finish and were subjected to bearing tests under rolling-sliding conditions. Post-test material investigations revealed cracks in the raceways and rollers. Detailed electron microscopy investigations showed highly...
Traditional metal-polymer sliding bearings have low cost and may operate under conditions of dry sliding friction; however, the wear rate of such bearings can be unacceptably high. This work tests the hypothesis that applying a layer of bulk oriented, polymer-based nanocomposites can reduce both the friction coefficient and wear rate. Bulk oriented nanocomposites based on ultra-high molecular weight...
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