Browsing by Author "AGUNSOYE, Johnson"
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Item The Development of Epoxy Hybrid Composite for Engineering Application(MONTREAL’2014 AES-ATEMA 17th International Conference Advanced Engineering Solutions (AES), Montréal, CANADA, 2014-06) AGUNSOYE, Johnson; Talabi, Segun; Hassan, Bolaji Sulaiman; Bello, Sefiu; Bello, LuqmanThe morphology, thermal stability and wear characteristics of the glass/graphite particulate hybrid epoxy resin composite have been studied. 80μm particulate sizes of glass and graphite were incorporated in the epoxy resin. The TGA 701 and wear on disc machine were used to characterise the epoxy resin graphite /discarded florescent tube particulates (ER/DFT/GP) composites’ ability to withstand heating and resistance of the composite to surface abrasion under dry lubrication conditions. The result revealed that the addition of graphite/glass particulates improved significantly the thermal stability and wear resistance of the ER/DFT/GP composites. The two parameters of load and speed caused increase in the wear volume of the ER/DFT/GP composites. Furthermore, the wear resistance increased as the percentage volume of the glass particles increased. Hence, the on of the DFT and GP in the epoxyItem Effect of Manganese Additions and Wear Parameter on the Tribological Behaviour of NFGrey (8) Cast Iron(Tribology in Industry, University of Maribor, 2012) AGUNSOYE, Johnson; Ochulor, E. F.; Talabi, Segun Isaac; Olatunji, S.The effect of manganese and wear parameter on the abrasive wear behaviour of NFGREY8 cast iron composition under dry lubrication conditions was investigated. The wear parameters studied are sliding speed, applied load, time and percentage of ferro-manganese additions. The experimental data were taken in a controlled way. Scanning electron microscope was used to examine the morphology of the samples. The results from linear regression equation and analysis of variances (ANOVA) shows that manganese additions, load and speed variable are more pronounced on the wear behaviour of the NFGrey (8) cast iron. The result showed that the additions of the 75 % ferro manganese grade decreases the carbon equivalent CE and fortify the matrix with the formation of tough (FeMn)3C inter-metallic leading to increased wear resistance of the examined composition.Item The Effects of Cocos Nucifera (Coconut Shell) on the Mechanical and Tribological Properties of Recycled Waste Aluminium Can Composites(2014) AGUNSOYE, Johnson; Talabi, Segun Isaac; Bello, S. A.; Awe, I. O.The dry sliding wear behaviour and mechanical properties of recycled aluminium metal matrix composite reinforced with 5 and 10 % coconut shell particles (CSp) has been investigated. The particle size of Cocosnucifera (coconut shell) that were used ranges from 50-300μm. The wear behaviors of developed samples were investigated under varied loads and speed using pin on disc equipment. The samples were also subjected to tensile, impact and hardness test. The result shows that the additions of coconut shell particles improved the wear resistance of the recycled aluminium can/CSp composites at low Speed (2.36 m/s). However, with increase in Speed (4.72 m/s), an increase in the specific wear rates were observed. Increasing the coconut shell particles additions to the recycled waste aluminium cans (RWAlC) reduced the impact resistance, hence the toughness of the RWAlC/CSp composite samples. However, the impact resistance of the composites increased as the Cocosnucifera particle size increased. The result of the filler size variation shows that decrease in filler particles size improved the tensile strength and yield strength of the developed aluminium metal matrix /CSp composite. The hardness of the composite increased with increased additions of the filler within the matrix.Item Effects of cow bone filler on the microstructure and mechanical properties of recycled polyethylene/cow bone particulate composites(Advanced Engineering Solutions (AES), Montréal, CANADA, 2012) AGUNSOYE, Johnson; Talabi, Segun Isaac; Obe, Adeola; Adamson, OlubukolaThe morphology and mechanical properties of cow bone reinforced polyethylene composite was evaluated to assess the possibility of using it as a new material for engineering applications. Cow bone reinforced matrix composite was prepared from low density polyethylene matrix containing up to 25% cow bone fillers and the effect of the filler on the mechanical properties of the composite was investigated. Scanning electron Microscopy (SEM) of the composites (with 0-25% filler) surfaces indicates good interfacial interaction between the bone fillers and the low density polyethylene matrix. The tensile strength and the hardness of the composite increases with increase in filler content while the impact strength and rigidity of the composite decreases with increase in the filler content.Item Properties optimization of Hadfield austenitic manganese steel casting(Annals of Faculty of Engineering Hunedoara-International Journal of Engineering, Faculty of Engineering Hunedoara, University Politehnica of Timisoara, 2015) AGUNSOYE, Johnson; Talabi, Segun IsaacThe properties of Austenitic Manganese Steel (AMnS), used for rock drilling, was optimized as a highly cost efficient and preferment material for the mining industry. To achieve this, inter-critical annealing and homogenization heat treatments operations were employed. Subsequently, relationships were established between various process parameters, mechanical properties, microstructure and alloying elements. Emphasis was given to the control of grain size and phases, most particularly secondary carbides. Hardness, impact and microscopy investigations were carried out on the heat treated samples. The results show an improvement in hardness and impact characteristic of the AMnS. The microstructures of the heat treated samples show substantial grain refinement and a uniform dispersion of secondary carbides along grain boundaries.Item WEAR BEHAVIOUR OF NF-GREY 8 ALLOYED WITH FEMN NANOPARTICLES(Annals of the Faculty of Engineering Hunedoara - International Journal of Engineering, 2016) AGUNSOYE, JohnsonThis study investigates the effects of ferromanganese nanoparticles additions on the hardness, impact energy and wear behaviour of a conventional(C=3.907%, Si=2.259%, Mn=0.509%, P=0.093%, S=0.081%) grey cast iron. The cast iron scraps were melted in a 40kg silicon crucible pit type furnace with and without addition of ferromanganese. A green sand mould of dimension 15 × 15 × 200mm was used for the production of the cast samples. The results obtained show an improvement in mechanical properties andwear resistance of the alloyed cast iron compared to the conventional cast iron. Comparison was also made to an earlier work in which microsized ferromanganese particles was used. It was found that smaller quantity of ferromanganese nanoparticles presented a better mechanical and wear properties.Item Wear characteristics of heat-treated Hadfield austenitic manganese steel for engineering application(Advances in Production Engineering & Management, University of Maribor, 2015) AGUNSOYE, Johnson; Talabi, Segun Isaac; Bello, OThe wear behaviour was investigated of heat treated Hadfield austenitic man-ganese steel (HAMnS). The wear test was carried out using spin on disc appa-ratus under different loading loads and speed conditions. A scanning electron microscopy (SEM), an X-ray diffractometer and micro-hardness testing ma-chines were used for examining the morphology, compositions and to meas-ure the hardness of the manganese steel, respectively. The results of the wear test showed that the sliding speed-time interactions effect gave the most significant effect on the austenitic manganese steel. The solution heat treat-ment programme increased the wear resistance of the alloy steel under in-creasing load, speed and time. The as-cast microstructure was characterized by heterogeneously dispersed chromium carbides second phase particle, and was responsible for the observed non-uniform wear rate. In regard to the solution heat treated HAMnS, the segregated carbides were dissolved at 1050 °C and uniformly dispersed within the matrix of its microstructure after rapid water quenching to room temperature. This later development was responsible for the uniform and improved wear resistance of the manganese steel casting. This work demonstrated significantly that there is a direct rela-tionship between the second phase carbides, their distribution and the wear rate pattern of HAMnS casting.