POTENTIAL-ENHANCEMENT OF DEGRADED ENGINE OIL FOR FRICTION REDUCTION IN COLD UPSET FORGING OF ALUMINIUM ALLOYS

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dc.contributor.authorUSMAN, Ibrahim
dc.date.accessioned2017-12-14T13:03:42Z
dc.date.available2017-12-14T13:03:42Z
dc.date.issued2014-08
dc.descriptionA THESIS SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES, AHMADU BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD OF A MASTER’S DEGREE IN METALLURGICAL AND MATERIALS ENGINEERING DEPARTMENT OF METALLURGICAL AND MATERIALS ENGINEERING, FACULTY OF ENGINEERING AHMADU BELLO UNIVERSITY, ZARIA NIGERIAen_US
dc.description.abstractEnhancement of the friction-reducing properties of degraded 20W-50 engine oil by blending with neem and palm kernel oils respectively for application in cold upset-forging of aluminium alloys has been investigated using the ring compression test procedure. Three sets of blends of each of the vegetable oils with the degraded engine oil in the ratios 40:60, 50:50 and 60:40, the engine oil (unused and degraded) and the individual vegetable oils were investigated for friction reduction. Based on the modified empirical formula for friction coefficient determination under the various lubrication conditions, the average values of friction coefficient, μ obtained under the investigated unused engine oil, degraded engine oil, pure neem oil, 40% neem oil, 50% neem oil, 60% neem oil, pure palm kernel oil, 40% palm kernel oil, 50% palm kernel oil and 40% palm kernel oil oils were 0.073, 0.092, 0.068, 0.068, 0.062, 0.060, 0.057, 0.080, 0.058 and 0.057 respectively. Close correlations were observed betweencurves of these friction values andthe standard calibration curves proposed by Male and Cockroft. On comparative basis with degraded oil lubrication condition with average friction coefficient of 0.092, appreciable reduction in friction values were obtained. The lowest average was obtained under 60% palm kernel oil mixed with degraded engine oil. This is attributable to increased viscosity and fatty acid quantity/quality of the investigated vegetable oil. However, based on curves of plot of coefficient of friction against percentage reduction in height, 40% and 50% neem oil in degraded oil could be adjudged the best blend ratios as their coefficients of friction fall with increasing deformation, whereas most of the blends of palm kernel considered in this work demonstrated unstable trends. Best results for neem oil blends with degraded oil could be attributed to the favorable physicochemical properties of the parent vegetable oil.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/9684
dc.language.isoenen_US
dc.subjectPOTENTIAL-ENHANCEMENT,en_US
dc.subjectDEGRADED ENGINE OIL,en_US
dc.subjectFRICTION,en_US
dc.subjectREDUCTION,en_US
dc.subjectCOLD UPSET FORGINGen_US
dc.titlePOTENTIAL-ENHANCEMENT OF DEGRADED ENGINE OIL FOR FRICTION REDUCTION IN COLD UPSET FORGING OF ALUMINIUM ALLOYSen_US
dc.typeThesisen_US
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