Browsing by Author "Odusote, J. K."

Now showing 1 - 7 of 7
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    Effect of using vegetable oils as quenching media for pure commercial aluminium
    (Proceedings of International Conference on Clean Technology & Engineering Management, 2012) Adekunle, A. S.; Odusote, J. K.; Rabiu, A. B.
    This paper presents the effects of rate of heat extraction by groundnut, melon, palm kernel, shea butter and palm oils on the mechanical properties of various samples of pure commercial aluminium heat treated at 200°C, 250°C, 300°C and 350°C. Muffle furnace equipped with digital thermometer and thermocouple was used for the heat treatment. Tensile strength and hardness tests were carried out using Instron Universal Tester and Vickers hardness methods, respectively. Results obtained from the experiment were presented graphically. The results showed that palm kernel oil cools faster at 200°C and 250°C, while palm oil and shea butter oil quench faster at 300°C and 350°C, respectively. Palm kernel oil offers the highest elongation at 200°C, while at 350°C shea butter oil gave the best result. The best among the bio-quenching oils in providing good ductility is shea butter oil at 200°C, while at 300°C and 350°C groundnut oil give the best result. Highest hardness values were obtained from samples quenched in melon oil between 200°C-300°C. However, these values decreased with increased heating temperature probably due to density and viscosity variation with temperature rise. Similar observations were made on most of other samples quenched in other bio-quenching oils used in this experiment. This study shows that these locally available vegetable oils have promising potentials to serve as a possible replacement for non-biodegradable mineral oils in many applications
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    EFFECT OF VEGETABLE OIL QUENCHANTS ON THE PROPERTIES OF ALUMINUM DURING SOLUTION HEAT TREATMENT
    (Journal of Mechanical Engineering and Sciences (JMES), 2015) Odusote, J. K.; Adekunle, A. S.; Rabiu, A. B.
    Proper selection of appropriate quenching media can result in improved mechanical properties of pure commercial aluminum after solution heat treatment. This paper presents the effect of heat extraction by groundnut, melon, palm kernel, shea butter and palm oils on the mechanical properties of various samples of pure commercial aluminum heat treated at 200 °C, 250 °C, 300 °C and 350° C. A muffle furnace equipped with a digital thermometer and a thermocouple was used for the solution heat treatment. Tensile strength and hardness tests were carried out using an Instron Universal Tester and Vickers hardness methods, respectively. The results showed that palm kernel oil cools faster at 200 °C and 250 °C, while palm oil and shea butter oil quench faster at 300 °C and 350 °C, respectively. Solution heat treatment with palm kernel oil offered the highest percentage elongation at 200 °C, while at 350 °C shea butter oil gave the best percentage elongation. The best among the bio-quenching oils in providing good ductility is shea butter oil at 200 °C, while at 300 °C and 350 °C groundnut oil gives the best result. Highest hardness values were obtained from samples quenched in melon oil between 200 °C and 300 °C. However, these values decreased with increased heating temperature, probably due to the density and viscosity variation with temperature rise. Similar observations were made on other samples quenched in other bio-quenchant oils used in this experiment. This study shows that locally available vegetable oils have promising potential to serve as a possible replacement for nonbiodegradable mineral oils in many applications.
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    Evaluation of Mechanical Properties of Medium Carbon Steel Quenched in Water and Oil
    (AU Journal of Technology, 2012) Odusote, J. K.; Ajiboye, T. K.; Rabiu, A. B.
    Samples of medium carbon steel were examined after heating between 900ºC980ºC and soaked for 45 minutes in a muffle furnace before quenching in palm oil and water separately. The mechanical behavior of the samples was investigated using universal tensile testing machine for tensile test and Vickers pyramid method for hardness testing. The microstructure of the quenched samples was studied using optical microscope. The tensile strength and hardness values of the quenched samples were relatively higher than those of the as-cast samples, suggesting improved mechanical properties. However, samples quenched in palm oil displayed better properties compared with that of water-quenched samples. This behavior was traced to the fact that the carbon particles in palm oil quenched samples were more uniform and evenly distributed, indicating the formation of more pearlite structure, than those quenched in water and the as-received samples.
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    Mechanical Properties of Banana Pseudo Stem Fibre Reinforced Epoxy Composite as a Replacement for Transtibial Prosthetic Socket
    (Association of Professional Engineers of Trinidad and Tobago, 2016) Odusote, J. K.; Oyewo, A. T.; Adebisi, J. A.; Akande, K. A.
    Using natural plant fibres as reinforcement in polymers has earned relevance in recent years due to their eco-friendly nature. Thus, an investigation was undertaken on banana pseudo stem, a natural fibre abundantly available in Nigeria. Banana pseudo stem fibres are not only strong and lightweight, but also relatively inexpensive for they are often considered as waste. The purpose of this study is to establish the tensile, flexural, and hardness properties of banana pseudo stem reinforced in epoxy composite materials. This is projected to serve as a replacement to the currently used synthetic glass fibre transtibial prosthetic socket. The resin used was epoxy (TKL 121). Composite samples, after treatment of the continuous fibres with 5 % NaOH and 2 % ascetic acid solution, were prepared manually using hand-lay-up method with the fibre ratio of 0, 20, 30, 40 and 50 %. The results of 30 % glass fibre polyester composite (GFPC) were compared with those of banana pseudo stem epoxy composite (BPEC) produced in this study. The tensile, hardness and impact tests of BPEC at 40 % fibre content were 64.23 ± 4.11 MPa, 63.31 ± 0.03 MPa, 55.23 ± 0.20 BHR, respectively. These were slightly lower than those of the glass fibre composite, which are respectively 65.72 ± 3.30 MPa, 66.10 ± 1.88 MPa, and 61.05 ± 1.77 BHR. Consequently, BPEC can further be developed to serve as a potential replacement for glass fibre composite in prosthetic socket application using standard production procedure.
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    Preparation of Silica from Cassava Periderm
    (School of Engineering, Widener University, U.S.A., 2016) Adepoju, A. D.; Adebisi, J. A.; Odusote, J. K.; Ahmed, I. I.; Hassan, S. B.
    Cassava peel is a substantial by-product of cassava processing and it constitutes about 13% of the crop. Cassava peel is still currently considered a waste often discarded into the environ-ment indiscriminately, and therefore economically underutilized. In the present work, silica was synthesized from cassava periderm via sol gel route. Cassava periderm was burnt at 600 oC to obtain Cassava Periderm Ash (CPA) prior to alkaline leaching of the silica content which was thereafter precipitated with acid. The silica aquagel was then prepared by pH controlled titration and aging, and followed by drying to form silica. Quantitative analysis showed that silica yield from CPA was 61.53%. The morphology, elemental composition and phases of the silica were investigated with SEM, EDX and XRD respectively. SEM revealed that silica particles are small but not uniform. The EDX compositional analysis confirmed the presence of Si silicon among others present. The Sherrer’s equation used to evaluate the particle size showed that the aver-age particle size of the silica was 62.69 nm. The silica obtained could be used as desiccant in the laboratory, and industrially, as filler for polymer composites and feedstock for production of silicon used in the manufacture of solar panel.
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    Preparation of Silica from Cassava Periderm
    (School of Engineering, Widener University, U.S.A., 2016) Adepoju, A. D.; Adebisi, J. A.; Odusote, J. K.; Ahmed, I. I.; Hassan, S. B.
    Cassava peel is a substantial by-product of cassava processing and it constitutes about 13% of the crop. Cassava peel is still currently considered a waste often discarded into the environment indiscriminately, and therefore economically underutilized. In the present work, silica was synthesized from cassava periderm via sol gel route. Cassava periderm was burnt at 600 °C to obtain Cassava Periderm Ash (CPA) prior to alkaline leaching of the silica content which was thereafter precipitated with acid. The silica aquagel was then prepared by pH controlled titration and aging, and followed by drying to form silica. Quantitative analysis showed that silica yield from CPA was 61.53%. The morphology, elemental composition and phases of the silica were investigated with SEM, EDX and XRD respectively. SEM revealed that silica particles are small but not uniform. The EDX compositional analysis confirmed the presence of Si silicon among others present. The Sherrer's equation used to evaluate the particle size showed that the average particle size of the silica was 62.69 nm. The silica obtained could be used as desiccant in the laboratory, and industrially, as filler for polymer composites and feedstock for production of silicon used in the manufacture of solar panel.
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    Stress corrosion cracking of austenitic stainless steels in chloride environment
    (Faculty of Engineering, Ahmadu Bello University, Zaria, Nigeria, 2015) Ahmed, I. I.; Alabi, A. G. F.; Odusote, J. K.; Aremu, I. N.; Adebisi, J. A.; Yahaya, T.; Talabi, S. I.; Yahya, R. A.; Lyon, S. B.
    This study was carried out to assess the effect of applied potentials on Stress Corrosion Cracking (SCC) of Austenitic Stainless Steels (ASS), Type 304L in a potentiostatically controlled chloride environment at ambient temperature. The stress corrosion cracking tests were carried out on annealed ASS using a Slow Strain Rate Test (SSRT) technique in sodium chloride solution acidified with hydrochloric acid at ambient temperature. Analyses of failed specimens were carried out using optical microscope. The study showed that plastic elongation, ultimate tensile strength and time to failure decrease as the applied potential increases during the slow strain rate test. The study showed that immunity of ASS to chloride SCC was improved when the electrochemical potential was maintained in the primary passive potential range. Analysis of failed samples showed evidences of SCC.