Aweda, Jacob Olayiwola
@unilorin.edu.ng
Professor/Department of Mechanical Engineering/Faculty of Engineering and Technology
University of Ilorin, Nigeria/Professor
Born on Jan 15, 1958 in Nigeria, saddled with teaching, research and community development at the University of Ilorin as a Professor.
Now a Director of Unilorin Renewable Energy Center.
EDUCATION
PhD in Mechanical Engineering
RESEARCH, TEACHING, or OTHER INTERESTS
Mechanical Engineering, Industrial and Manufacturing Engineering, Renewable Energy, Sustainability and the Environment, Materials Science
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Peter Omoniyi, Idehai Ohijeagbon, Jacob Aweda, Olatunji Abolusoro, and Esther Akinlabi
Elsevier BV
M.Y. Kolawole, J.O. Aweda, S. Abdulkareem, S.A. Bello, A. Ali, and F. Iqbal
National Library of Serbia
Nowadays, low-cost particulate reinforced metal matrix composites with improve mechanical properties are highly sought in various industrial and critical engineering applications including automotive and aerospace sectors. Meanwhile, increasing consumption rate of African giant land snail (Archachatina marginata) had been posing disposal challenges of its shells. Therefore, this paper tends to investigates the influence of waste snail shells particulates on the physical and mechanical properties of recycled aluminum- silicon alloy matrix. Different weight proportions i.e. (0 - 7.5) wt% of calcined snail shell particles at an interval of 1.5 wt% were successfully incorporated into Al-Si alloy matrix melted at 750 ?C using stir-casting route. The microstructure, physical and mechanical properties of the resulting composites were examined and presented. Microstructural examination shows fairly uniform dispersion of snail shell particles in the aluminium alloy matrix intermingled with aluminium-silicon dendrites. Mechanical properties such as hardness, impact, compressive and tensile strengths increased with increasing addition of calcined snail shell particulate up to 6 wt% while density and elongation decreases. The total equivalent density reduction of 5.4% in composites compared to unreinforced alloy was obtained at 7.5 wt% snail shell addition. The maximum hardness, impact, compressive and tensile strengths obtained are 118?4 HV, 88 J, 552?20 MPa and 211 ? 4.8 MPa equivalent to 21, 25, 19 and 36 percent increase respectively relative to un-reinforced aluminium-silicon alloy. Hence, mechanical and physical properties of Al-Si alloy can be enhanced using calcined snail shell particulates which can widen its application in automotive industries.
S. Abdulkareem, T. S. Ogedengbe, J. O. Aweda, T. K. Ajiboye, A. A. Khan, and M. A. Babatunde
IOP Publishing
Abstract Steels are basically classified based on their carbon contents. In view of this, the processing of steels is greatly affected by their composition, particularly their carbon content. This paper reports on the machinability of three different steels with varying carbon contents. The steel samples were sourced from Owode metal market in Ilorin, Kwara State and their percentage compositional analysis was carried out at Universal Steels Limited, Lagos. The steel samples were classified into high, medium and low carbon steels based on their percentage carbon content. The machining condition was wet and the machining parameters used were depth of cut (0.2 – 0.6 mm), feed rate (0.05 – 0.15 mm/rev), and cutting speed (100 - 150 rpm). The experimental runs were designed using Taguchi orthogonal array of Minitab version 16 and the cutting temperature was monitored with a digital thermometer and k-type thermocouple wires. The experimental results were analysed using Minitab 18 with a focus on percentage contribution of various factors affecting surface roughness, chip morphology, cutting temperature and material removal rate. Results show that surface finish is highest in low carbon steel and lowest in high carbon steel. The responses show that machinability of the steel improved with a reduction in carbon content.
A.A. Adeleke, P.P. Ikubanni, T.A. Orhadahwe, J.O. Aweda, J.K. Odusote, and O.O. Agboola
Elsevier BV
J.O. Aweda, T.A. Orhadahwe, and I.O. Ohijeagbon
IOP Publishing
The effect of subjecting mild steel to several cycles of rapid heat treatment on its mechanical properties and microstructure was investigated. Mild steel of 0.213 wt % carbon was subjected to transformation heat treatment from austenite to pearlite and quenched in running water. Rapid heating was achieved by preheating an electric muffle furnace to 840 °C before charging the samples into it. Each cyclic heat treatment was for a period of 200 seconds held at 840 °C and cooled to 700 °C which was repeated four times. The effects of cycle numbers were evaluated by testing for impact, hardness, ultimate tensile strength and microstructural properties. The results showed that after 4th cycle of rapid heating the samples had impact energy 64.6 J, Brinell hardness number 563 and ultimate tensile strength 1257.78 N/mm2. The samples after one cycle had ultimate tensile strength 1027.45 N/mm2, % elongation 10.396% and impact energy 286.174 N.m before failure. Through cyclic heating, grain refinement was achieved by the fast simultaneous nucleation at the grain boundaries and the fast martensite to austenite transformation due to the fast heating rate which prevented austenite grain growth. Mechanical properties of the studied steel sample were improved with the rapid heat treatment cycles given.
I. O. Ohijeagbon, O. C. Omoragbon, J. O. Aweda, A. S. Adekunle, and J. F. Opadiji
IOP Publishing
- A developmental design of an orthopaedic recovery system has been conducted. Anthropological data of mass and length distribution of the body segments were used to estimate the components and total length of the main supporting frame and maximum body load that may be accommodated by the system. Vital geometrical, operational load and power parameters were also designed for the required hydraulic subsystems. Results show that the total length of the main supporting frame of the system is 2.237 m and the maximum body load that can be accommodate on the system is 371 kg. The load and power requirements were highest at the hip joint, with the following values: maximum supporting load 2,313.16 N, internal pressure of hydraulic system 379.89 kN/m 2 , buckling load of connecting rod 9252.64 N, critical buckling load of hydraulic system 13370.06 N, required power 86.56 W, expected electrical power input 149.93 W and spring stiffness 6.18 kN/m respectively. When constructed, the developed design is expected to facilitate treatment and recovery of orthopaedic patients. Physiotherapeutic services for body joints related problems would be greatly aided to offer better quality services. Required human involvement and effort on the side of the service providers shall be greatly reduced.
J. O. Aweda, P. O. Omoniyi, and I. O. Ohijeagbon
IOP Publishing
Economic advantage of waste has been clamoured severally in order to improve the environment and reduce pollution. In Nigeria, the common materials used for the production of paving tiles are granite dust and cement, in some cases silica sand is added. This study is aimed at investigating the feasibility of using available raw materials such as laterite, silica sand and pulverized cow bones to develop paving tiles. Tiles of 200 mm × 100 mm × 60 mm were produced and the effects of various materials added were investigated and analysed. The production method employed was casting and curing was done for twenty-eight (28) days. Physical and mechanical analyses of the paving tiles showed that the tiles with mixing ratio of 4:1:3 (laterite: pulverized cow bones: silica sand) with 20% cement stabilization was the optimum mix ratio, producing the maximum compressive strength and modulus of rupture of 5.05 MPa and 1.83 MPa respectively.
M.Y. Kolawole, , J.O. Aweda, S. Abdulkareem, , and
Universiti Malaysia Pahang Publishing
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 C calcined temperatures for 3hrs. The results obtained show that the snail shell powder possesses chemical hard phase oxides (CaO, Fe2O3, Al2O3, Cr2O3, SiO2, MnO and NiO) at all calcined temperature values. The maximum amount of these phases was formed at a 900 C calcined temperature. The XRD analysis also confirmed the presence of calcite (Ca6C6O8), lime (Ca4O4) and portlandite (CaO2H2) as the thermally stable major hard phases of the SnS calcined at 900 C. The density and refractoriness temperature of the snail shell powder as obtained in this study are 1.63 g/cm and 1400 C. The TGA result shows that the SnS attained its thermal stability at 840C. 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.
S. Abdulkareem, S. Ogunmodede, J.O. Aweda, A.T. Abdulrahim, T.K. Ajiboye, I.I. Ahmed, and J.A. Adebisi
International Journal of Technology
This paper reports on the investigation of thermal properties of Kapok, Coconut fibre and Sugarcane bagasse composite materials using molasses as a binder. The composite materials were moulded into 12 cylindrical samples using Kapok, Bagasse, Coconut fibre, Kapok and Bagasse in the ratios of (70:30; 50:50 and 30:70), Kapok and Coconut fibre in the ratios of (70:30; 50:50 and 30:70), as well as a combination of Kapok, Bagasse and Coconut fibre in ratios of (50:10:40; 50:40:10 and 50:30:20). The sample size is a 60mm diameter with 10mm – 22mm thickness compressed at a constant load of 180N using a Budenberg compression machine. Thermal conductivity and diffusivity tests were carried out using thermocouples and the results were read out on a Digital Multimeter MY64 (Model: MBEB094816), while a Digital fluke K/J thermocouple meter PRD-011 (S/NO 6835050) was used to obtain the temperature measurement for diffusivity. It was observed that of all the twelve samples moulded, Bagasse, Kapok plus Bagasse (50:50), Kapok plus Coconut fibre (50:50) and Kapok plus Bagasse plus Coconut fibre (50:40:10) has the lowest thermal conductivity of 0.0074, 0.0106, 0.0132, and 0.0127 W/(m-K) respectively and the highest thermal resistivity. In this regard, Bagasse has the lowest thermal conductivity followed by Kapok plus Bagasse (50:50), Kapok plus Bagasse plus Coconut fibre (50:40:10) and Kapok plus Coconut fibre (50:50).
J.O. Aweda and M.B. Adeyemi
Elsevier BV
J.O. Aweda and M.B. Adeyemi
Elsevier BV