Browsing by Author "Kolawole, M.Y."
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Item Archachatina marginata bio-shells as reinforcement material in metal matrix composites(International Journal of Automotive and Mechanical Engineering, 2017) Kolawole, M.Y.; Aweda, J.O.; Abdulkareem, S.Snail shells (SnS), which represent the discarded bio-shell waste of snails’ remnants from restaurants and eateries constitute a serious degree of environmental threat with little or economic value. The effective utilisation of this waste into a green metal matrix composite as a low cost reinforcement material applicable in the automotive industry in lieu of its present hazardous impact had stimulated the research interest. Hence, this paper studies the potential utilisation of SnS as a low cost reinforcement material in the metal matrix composites (MMCs) by means of a characterisation technique. The mineralogical composition and physical properties of the snail shell powder was carried out using the density determination, thermogravimetric analysis (TGA), refractoriness, energy dispersive X-ray (SEM/EDX), X-ray fluorescent (XRF) and the X-ray diffraction (XRD) analysis at 0, 800, 850 and 900 oC calcined temperatures for 3hrs. The results obtained show that the snail shell powder possesses chemical hard phase oxides (CaO, Fe2Al2O3, Cr2O3, SiO2, MnO and NiO) at all calcined temperature values. The maximum amount of these phases was formed at a 900 oC calcined temperature. The XRD analysis also confirmed the presence of calcite (Ca6C6O8), lime (Ca4O4) and portlandite (CaO2) as the thermally stable major hard phases of the SnS calcined at 900 oC. The density and refractoriness temperature of the snail shell powder as obtained in this study are 1.63g/cm3 and 1400 oC. The TGA result shows that the SnS attained its thermal stability at 840 oC. The above results imply that SnS with (9.4-25.9) % lesser density when compared with agro or industrial wastes reinforcement material (flyash, coconut shell ash, maize husk, bagasse) in the metal matrix composite looks promising as a reinforcing material in the production of light weight metal matrix composites at low costs. Also, the high refractoriness temperature of the snail shell particle suggested it as a suitable candidate reinforcement material in the production of thermal resistance MMCs applicable in automotive components such as pistons and connecting rods.Item Design, Fabrication and Performance Evaluation of Awning/Canopy for Thermal Comfortability(Journal of Engineering and Technology, 2017) Ajao, K.R.; Yahaya, T.; Kolawole, M.Y.; Aweda, J.O.This paper presents the design, fabrication and performance evaluation of retractable awning/canopy system for thermal comfortability. It consists of frame (mild steel bars), linear actuator, fabric (acrylic), adapter, roller pathways and photo sensor (for easiness of control). After fabrication and coupling of the whole components of the retractable awning and connecting to the adapter and power source for performance test evaluation, it was observed that, the actuator arm which was coupled to the fabric began projecting outward and once the photo sensor was shaded from sunlight using a dark material, the fabric retracted into the roller. Also it was noted that, shading the window provided a reduced solar heat gain factor of 28.16W as compared to the solar gain factor of 498.54 W before shading the window with a cooling load of 415.37 W achieved. This can be incorporated into a building plans especially those at the sun heating direction and temperature region to reduce inner temperature aid air-conditioner loading for longer life and efficient operation.Item Evaluation of mechanical and electrical properties of squeeze cast 1xxx aluminium(Nigerian Research Journal of Engineering and Environmental Studies, 2018) Kolawole, M.Y.; Aweda, J.O.; Abdulkareem, S.The effect of squeeze cast pressure on the mechanical and electrical properties of 1xxx aluminium was experimentally studied. Aluminium (1xxx) metal was melted and poured into a preheated split die at 700±10 oC. Varying values of pressures were applied on the cast using Vega hydraulic press to produce sound cast samples. Mechanical, microstructural and electrical properties of cast products were examined on Monsanto universal tensile testing machine (UTM), Rockwell hardness tester and DC 4 probes wire respectively. The results of the investigations revealed that squeeze cast pressure influenced the microstructure through grain refinement which led to enhancement of the mechanical properties of the metal. Improvement of 41.03 % in hardness at applied pressure of 190 MPa and 200% in tensile strength at applied pressure of 127 MPa were obtained for the squeeze cast metal. There was an increase in electrical conductivity by 18.5 % at 127 MPa applied squeeze cast pressure. Squeeze casting is thus presumed to be a suitable processing route for improving the mechanical and electrical properties of aluminium metal of 1xxx series.Item Performance evaluation of permanent steel mould for temperature monitoring during squeeze casting of non-ferrous metals(Pacific Journal of Science and Technology, 2014) Aweda, J.O.; Kolawole, M.Y.Permanent steel mold was designed, machined and evaluated by monitoring the temperature of squeeze cast aluminum and brass rods on a Vega hydraulic press. The operation was performed with and without pressure on the cast specimen at pouring temperature of 700 0C and 980 C for aluminum and brass metals, respectively. The solidification rate (temperature with time) was monitored with a three-channel digital temperature monitor data logger while the tensile strengths of both samples were also determined. The results showed an increase in the solidification rate for both samples with increase in the applied pressure. The maximum solidification rate for aluminum was obtained at an applied pressure of 127 MPa and 95 MPa for brass. The tensile strength of both samples increased with increase in applied pressure. The maximum tensile strength of 34.38 MPa was obtained for aluminum at applied pressure of 127 MPa and 80.21 MPa for brass at an applied pressure of 95MPa. Above these values there was no significant increase in the tensile strength with increase in applied pressure. The results obtained were similar to that already established in the literatures which make the machined permanent steel mold suitable for squeeze casting of non-ferrous metals