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Tribological characteristics of elastomers lubricated with EALs and contaminated EALs
2008 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The friction and wear characteristics of several elastomers are investigated under sliding contact lubricated by environmentally adapted lubricants with varying degrees of contamination. The elastomers studied are flat strips of Nitrile Butadiene rubber (NBR), Hydrogenated Nitrile Butadiene Rubber (HNBR), and Fluorocarbon Rubber (FKM) and O-Rings of both molded and extruded NBR and FKM. The lubricants used are uncontaminated Complex Ester and Polyolester as well as both Aged and Un-Aged Polyolesters with 5\% Water Content as well as a commercial synthetic based turbine oil and a commercial mineral oil based turbine oil. Initial experiments were conducted using a Cameron-Plint test rig with a steel cylinder sliding in the longitudinal direction with a reciprocating motion against a curved elastomer specimen to avoid any edge contact. Sliding velocities were maintained low to reduce the thermal effects often associated with elastomer friction. The results from these experiments demonstrate the compatibility of the different elastomers with the various lubricants and load configurations. Further testing was conducted using the Cameron-Plint machine with O-ring material sliding against flat steel plates results of which validated the use of synthetic ester in lieu of mineral base oils in the case of sealing surfaces of proper roughness and found that extruded NBR performed best of the tested materials. Experiments were also conducted using an SRV Optimol test rig at higher frequencies with a steel cylinder in contact with an elastomer disc. The results from the SRV test rig conflicted significantly with those of the Cameron-Plint rig due to the differences in contact geometry of the tests. Other experiments conducted using an Abrasive Test machine which reciprocated a steel ring against elastomer specimens produced no worthwhile results other than demonstrating the durability of the elastomer specimens when operating in the elasto- hydrodynamic lubrication regime.

Place, publisher, year, edition, pages
Keyword [en]
Technology, tribology, environmentally adapted lubricants, ea, l, elastomer, nbr, hnbr, fkm, seal, hydropower, hydro-electric, power, water contamination
Keyword [sv]
URN: urn:nbn:se:ltu:diva-59082ISRN: LTU-PB-EX--08/041--SELocal ID: f9bf5026-59a8-46ed-8296-7182835eb37bOAI: diva2:1032470
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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