Adebayo Surajudeen ADEKUNLE
@unilorin.edu.ng
Scopus Publications
Scopus Publications
Adebayo Adekunle, Mojeed Okunlola, Peter Omoniyi, Adekunle Adeleke, Peter Ikubanni, Tajudeen Popoola, and Kobe Ibrahim
SCI AND TECH UNIVERSAL INC
Asbestos has been banned in many countries as a result of its negative effects on the environment and human health. As a result, a human-friendly friction material is required to replace asbestos in brake pads. Hence, the powder metallurgy technique was undertaken to develop friction material from locally sourced asbestos-free materials. Seashell was used as base elements with other additives. The filler material considered had a particulate size of 300 µm
Peter Omoniyi, Adebayo Adekunle, Segun Ibitoye, Olalekan Olorunpomi, and Olatunji Abolusoro
Elsevier BV
I. O. Ohijeagbon, A. A. Adeleke, P. P. Ikubanni, T. A. Orhadahwe, G. E. Adebayo, A. S. Adekunle, and A. O. Omotosho
Walter de Gruyter GmbH
Abstract The study employed the phenomenon of friction between liquid droplets and solid metallic surfaces in surface roughness analysis of engineering materials. Five samples of mild steel plate were prepared to different degrees of surface roughness by facing operation. The sample surfaces were analysed to determine the roughness parameters (mean roughness, root mean square roughness, roughness skewness, and roughness kurtosis) and friction coefficient of the surfaces. Oil droplet sliding velocity was determined using the oil slippage test. The friction coefficient of the surfaces increased with increasing roughness parameter which varied from 26.334 µm at friction coefficient = 0.63 to 13.153 µm at friction coefficient = 0.46. The results from oil slippage test showed that the sliding velocity of the oil drop decreased as the friction coefficient of samples increased. At an inclination angle of 30°, sliding velocity varied from 0.51 cm/s at friction coefficient = 0.63 to 0.92 cm/s at friction coefficient = 0.46. Some of the samples exhibited a deviation in the trend of relationship between friction coefficient and sliding velocity which resulted from the variation in peak height of roughness between the sample surfaces. Oil slippage method predicts the surface behaviours of materials based on their surface parameters.
Adebayo Surajudeen Adekunle, Adekunle Akanni Adeleke, Peter Pelumi Ikubanni, Peter Olorunleke Omoniyi, Tajudeen Adelani Gbadamosi, and Jamiu Kolawole Odusote
Akademiai Kiado Zrt.
AbstractHeat treatment industries require various quenching media to improve the properties of the materials to be quenched. Petroleum based mineral (PBM) oil, a non-biodegradable oil, is popular amongst others quenchants in heat treatment processes. Recently, biodegradable oils mostly in their raw, unblended and unbleached forms have been employed for quenching of various engineering materials. Therefore, the present study examined the effects of some selected bio-quenchants in blended raw (BR) and blended bleached (BB) forms on the mechanical properties and microstructure of solution heat treated aluminum (Al)-alloy. Edible vegetable oil (70% by volume) was blended with 30% by volume of jatropha oil to form the bio-quenchant oils. Another set of bio-quenchants were formed by bleaching the raw oils before mixing so as to reduce the oxidation level and contaminations in the oil. The Al-alloy is solution heat treated at 500 °C and soaked for 15 min in an electric muffle furnace before quenching in the various established bio-quenchants. Results showed that samples treated in blended raw melon (BRM) oil have higher tensile strength of 151.76 N/mm2 while samples quenched in blended bleached melon (BBM) oil have higher hardness value of 61.00 HRC. In accordance to the results obtained the bio-quenchants were found to be effective replacement to the PBM oil.
A. S. Adekunle, A. A. Adeleke, P. P. Ikubanni, and O. A. Adewuyi
Technoscience Publications
The inhibitive properties of the extracts of Cascabela thevetia and Jatropha curcas were comparatively studied on corrosion of mild steel in H2SO4 acid. The extracts of both plants contained active phytochemical constituents such as tannins, saponins, alkaloids, flavonoids, terpenes and phenols which made them useful as good corrosion inhibitors. The extract concentrations were varied from 0.3 to 1.5 g/L during both the gravimetric and gasometric analyses for an exposure time of 7-28 days. The weight loss of the coupon, corrosion rate, surface coverage and inhibitive efficiency was evaluated for both the extracts. The results of the gravimetric and gasometric analyses indicated that inhibitive efficiency increased with an increase in the concentration of inhibitors and the highest was 55.77% for Jatrophas curcas at the concentration of 1.5 g/L. The weight loss was a little lower for Cascabela thevetia (4.36 g) compared to Jatrophas curcas (4.66 g) at the highest exposure time used (28 days). Cascabela thevetia has a better surface coverage (0.68) than Jatropha curcas (0.61), hence, Cascabela thevetia inhibits better for a 7-day exposure time. However, when the mild steel was further exposed for more than 7 days, Jatropha curcas exhibited a better inhibitive property. The highest and least hydrogen gas evolution was obtained at 0.3 g/L concentration (7 minutes) and 1.5 g/L concentration (1 minute) for both Cascabela thevetia and Jatropha curcas leaves extracts, respectively. Based on the results, the utilization of extracts of Cascabela thevetia and Jatropha curcas leaves as replacements for toxic organic inhibitors in industries are recommended.
A. Surajudeen Adekunle, A. Akanni Adeleke, P. Pelumi Ikubanni, K. Adekunle Adebiyi, and O. Adekunle Adewuyi
Institute of Metals and Technology
A.S. Adekunle, A.A. Adeleke, C.V. Sam Obu, P.P. Ikubanni, S.E. Ibitoye, and T.M. Azeez
Informa UK Limited
Abstract Recycled plastic wastes polyethylene terephthalate (PET), high-density polyethylene (HDPE) and polypropylene (PP) were studied in the presence of Ethylene glycidyl methacrylate (EGMA) copolymer compatibilizer, as raw materials for producing automobile bumper. These plastic wastes were cleaned and dried, then crushed to < 3 mm in size and further dried for 4 h to remove moisture. Crushed samples were weighed in different proportions with varying amount of compatibilizer (5–15 g) and manually mixed. Recycled composite plastic of 150 × 150 × 3 mm in length, width and thickness, respectively, was produced from weighed samples in an injection moulding machine at 150–220oC and pressure of 150 bar. Mechanical tests and morphological observation were carried out on the blend. The mechanical properties were more dependent on EGMA in the blend produced than the variation of the PET, PE and PP. The results showed that the optimum tensile strength (25.48 N/mm2), elongation at break (40.75%), Young’s modulus (1615.96 N/mm2) and impact strength (179 J/m) were obtained when 10 g of EGMA was used with 164: 18:18 g of PET, PEL and PP, respectively. The morphology of the sample examined showed the presence of discrete particles with cracks, cavities and various separations, and they defined the mechanical behaviour of the samples. Compared to some standard materials used to produce car bumper, the recycled blend in this study showed huge potential for its production and thus, the use can help in reducing environmental pollution caused by plastic waste.
A. Adekunle, S. E. Ibitoye, P. Omoniyi, L. J. Jilantikiri, C. V. Sam-Obu and T. Yahaya
Biogas production was investigated in this study as an alternative to wood as fuel using slurries of cow dung (T1), jatropha fruit exocarp (T2), cattle dung and jatropha fruit exocarp (T3) and cow dung, jatropha fruit exocarp with 10 g of iron filings (T4). The 1000 mL of slurry which included 50 mL of inoculum that compensated for the dead or weak micro-organism was made for each sample. At the end of five weeks, the volume of biogas collected from the samples T1, T2, T3, and T4 when added up, gave 77, 154, 145 and 586 mL, respectively. The sample mixture of cow dung, jatropha fruit exocarp, and iron filings (T4), gave the highest yield of biogas production with an average weekly production of 59 mL/kg for four weeks and on the fifth week about six times emission of biogas was obtained. The production rate of the biogas was rapid after the gestation period and the T4 emerged as the most substantial emission of all the samples producing 350 mL/kg on the fifth week.
A.S. Adekunle, P.O. Omoniyi, S.E. Ibitoye, E.C. Ogbonna, and G.A. Akoh
African Journals Online (AJOL)
The project work entails design, fabrication and testing of a 15 litres semi-automatic liquid soap making machine for small and medium scale industry using cold process method. A survey carried out on conventional method (the local method) showed that the conventional method consumes time, energy, has low output and efficiency and is hazardous to health. The fabricated machine consists of four major components which are gear mechanism, four cylindrical chambers, agitators (impellers) and an electric motor. After evaluating its performance, the machine produced had a mixing and time efficiency of 93% and 92.2% respectively as compared to the conventional method which had a mixing and time efficiency of 81.7% and 36.7% respectively. Results obtained from the performance evaluation indicated that the machine saves time and energy, reduces material wastage, reduces hazards and hence; is far more efficient than the conventional method. Keywords: Fabrication, performance, liquid soap, machine, conventional method, efficiency
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.
.K. Odusote, , A.S. Adekunle, A.B. Rabiu, and
Universiti Malaysia Pahang Publishing
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.
I. O. Ohijeagbon, , H. D. Olusegun, A. S. Adekunle, O. S. Adewoye, A. O. Oladiji, , , , and
International Hellenic University
To investigate the impact of alternative replacement of granite-particles in the production of interlocking tiles. Aggregate mixes of homogeneously mixed raw materials was used for production of experimental interlocking tiles. The mortar method was used for casting purposes. Produced interlocking tiles were cured and treated for twenty-eight days before the physical and mechanical tests were conducted. For improved mechanical strength, an optimum mix of granite particles to lateritic soil to silica sand of 2:1:1 is recommended for suitable replacement for granite particles in the production of interlocking tiles. A simple model that relates the granite particles/cement ratio to water/cement ratio for interlocking tiles was determined, with a coefficient of correlation and standard error of estimate of 0.85 and 0.65 respectively. The investigation had shown that cheaper and easily available raw materials, such as lateritic soil and silica sand may be used as suitable replacement for granite particles in the production of interlocking tiles with acceptable properties. Developed model that relates the granite particles/cement ratio to water/cement ratio for interlocking tiles would be very useful for control studies or production purposes.
A. S. Adekunle, , I.O Ohijeagbon, H. D. Olusegun, , and
International Hellenic University
Melon shelling in most part of the world is usually done manually by hand, and like all other manual operations it is time consuming and strenuous. The design and construction of manually and motorized operated melon shelling machine using impact method was done in order to meet the domestic, commercial and industrial requirement of melon for food processing. Two of the main cultivars of melon found in Western part of Nigeria; which are Bara and Serewe can be shelled properly by this machine; the machine is made up of three sections namely the hopper, the shelling chamber which consists of the shelling disc and the shaft, and the gear system. The machine was made from locally sourced materials and it can be used in both urban and rural areas even where there is no power supply. The percentage of melon been shelled in either manual or motorized operation in two successive runs of the two types of melon (Bara and Serewe) was found to be above eighty percent (80%) and the shelling efficiency of the machine is above 68%.