Browsing by Author "Abdulrahman, K. O."
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Item Additive Manufacturing: Laser Metal Deposition and effect of Preheating on properties of deposited Ti-4822-4 alloy(IGI Global, 2019) Abdulrahman, K. O.; Akinlabi, E. T.; Mahamood, R. M.Three-dimensional printing has evolved into an advanced laser additive manufacturing (AM) process with capacity of directly producing parts through CAD model. AM technology parts are fabricated through layer by layer build-up additive process. AM technology cuts down material wastage, reduces buy-to-fly ratio, fabricates complex parts, and repairs damaged old functional components. Titanium aluminide alloys fall under the group of intermetallic compounds known for high temperature applications and display of superior physical and mechanical properties, which made them most sort after in the aeronautic, energy, and automobile industries. Laser metal deposition is an AM process used in the repair and fabrication of solid components but sometimes associated with thermal induced stresses which sometimes led to cracks in deposited parts. This chapter looks at some AM processes with more emphasis on laser metal deposition technique, effect of LMD processing parameters, and preheating of substrate on the physical, microstructural, and mechanical properties of components produced through AM process.Item Design of Low-Cost Vehicle for Nigerian Rural Farmers for Transportation of Farm Produce(USEP: Journal of Research Information in Civil Engineering, 2016) Abdulrahman, K. O.; Yahaya, S. A.The paper highlights various problems associated with the transportation of agricultural farm products by Nigerian rural farmers and discussed the classification of intermediate means of transportations (IMTs) and the common types of low-cost vehicles available. The research led to the design of an improved low-cost vehicle that is designed to be affordable, efficient and easy to maintain using locally sourced materials. The improvement in the design of the low-cost vehicle is seen in it compatibility, provision of roof cover, engine location at the rear, tilting of the trailer container, provision of more comfortable seats and the use of locally sourced materials for it construction.Item Design of Mini Combined Harvester(JPE: Journal of Production Engineering, 2017) Abdulkarim, K. O.; Abdulrahman, K. O.; Ahmed, I. I.; Abdulkareem, S.; Adebisi, J. A.; Harmanto, D.In this research, various problems associated with harvesting of agricultural food grains by local farmers in Nigeria were identified. The aim of the research was to design low cost multipurpose mini combined harvester for production using locally available materials at affordable cost. The research was to ensure improved performance and low cost maintenance of harvester for use by farmers in developing nations. The modelling of the chassis and other components of the combined harvester was done using Solid works 2014. The selection of materials for the design was achieved using Cambridge Engineering Selector (CES) 2014. Calculations for the design of each components and power requirements to determine the engine specifications were carried out to ensure optimal performance. The output of the research was the development of mini combine harvester which is a microcosm of large capital intensive harvester, at affordable cost to small scale farmer in developing nations. The research ensures the use of mechanised farming equipments designed and developed from local materials for effective harvesting and transportation of agricultural produce.Item Design, Construction and Testing of a 3.04m/60kg/50W, 24V D.C. Capacity Electrically Powered Sliding Residential Gate(USEP: Journal of Research Information in Civil Engineering, 2016) Ige, J. A.; Adedayo, S. M.; Abdulrahman, K. O.The need for a non manual and affordable residential gate by both rich and middle-class populace has brought out the need for designing, constructing and testing for reliability a remote controlled residential sliding gate. The design principle entails effecting a sliding motion of the gate through a rack and pinion mechanism. A rack of the same length as the gate length was attached to the gate in mesh with a pinion powered by a D.C. 50W, 24V motor. Control sensors were connected for remote control operation and detection of the terminal points of gate movement. The gate is of length 3.04m by 1.4m covered with aluminium sheet of thickness 0.2mm. The gear pinion and gate track roller diameter were 61mm and 100mm. The weight of the gate was made variable by attachments of known weight falling within 40 Kg to 80 Kg. Support guide made of low carbon steel pipe of square section 50mm was used to hold the gate in an upright position. Four rollers made of medium carbon steel was welded to the gate to aid the movement of the gate on the rail track which comprised of two angle bars formed into T shape. Operational performance tests showed a maximum opening velocity of 0.21m/s to 0.15m/s corresponding to gate weights 40 to 80kg respectively. Rolling track friction also affects velocity of the gate. The lubricated track indicated higher velocity than the dry trackItem Effect of set-up height on the performance of pot-in-pot cooling device for storing food and drugs at ambient temperature(FUOYE Journal of Engineering and Technology, 2019) Yahaya, S. A.; Akande, K. A.; Raji, A. O.; Abdulrahman, K. O.; Enagi, I. I.The research aimed at evaluating the effect of set-up height on the performance of earthenware pot-in-pot cooling system. The pots were set up at different heights; H1 (0 m), H2 (0.5 m) and H3 (1 m) and observed for 59 days from 8:00am to 6:00pm daily. The inner temperatures obtained from the three different arrangements were determined using standard methods. The result showed that increasing the height from ground level (0 m) to 1 m increases the mean cooling effect by 8 %. Generally, it was observed that only the set-up height at 1m proved to have maximum efficiency of the pot-in-pot system performance.Item Finite Element Analysis of Mini Combined Harvester Chassis and Hitch(JPE: Journal of Production Engineering, 2017) Abdulkarim, K. O.; Abdulrahman, K. O.; Ahmed, I. I.; Abdulkareem, S.; Adebisi, J. A.; Harmanto, D.The perennial problems associated with harvesting of agricultural products in sub-Sahara Africa are not unconnected with financial limitations of the farmers. The design of low cost mini combine harvester was aimed at ameliorating the challenges of agricultural products harvest in Nigeria. The work presented here was a detailed analysis of low cost mini combine harvester chassis and hitch. The need for cost effectiveness, affordability, durability and efficiency of the designs necessitated detail analysis of the design to achieve the above objectives. Solidworks Finite Element Analysis (FEA) software was employed in carrying out both static and fatigue analysis of a low-cost mini combine harvester chassis and hitch design. The results were compared and contrasted, with appreciable improvements on available existing data. The stresses, displacements and strains on the chassis were significantly low with factors of safety of 2.48 and 2.80 for chassis and hitch respectively.Item Laser Metal Deposition of Titanium Aluminide Composites: A Review(Elsevier-Materials Today, 2018) Abdulrahman, K. O.; Akinlabi, E. T.; Mahamood, R. M.; Pityana, S.; Tlotleng, M.Development of additive manufacturing (AM) from three dimensional printers with ability of producing parts having no need for tooling continue to wax stronger in the manufacturing field. Laser metal deposition, a technique in AM is usually employed to create solid components from model of computer aided design (CAD). Feeding powder supported by shielding gas employed by this technique, is injected into a melt pool produced by accurately focused laser beam on a substrate. This paper discusses some of the AM technologies available, review on laser metal deposition of titanium aluminide on other metals and alloys, relationship between the processing parameters and structural and mechanical properties of products produced, limitation as regards to the processing parameters employed, applications and possible recommendations. © 2018 Elsevier Ltd. All rights reserved.Item Laser Metal Deposition Technique: Sustainability and environmental Impact(Elsevier-Procedia Manufacturing, 2018) Abdulrahman, K. O.; Akinlabi, E. T.; Mahamood, R. M.Additive manufacturing (AM) is a term used in describing a set of manufacturing techniques that employs layer upon layer production of parts and components through the application of 3D model data and inputs of raw material. The technology easily comes to mind in the recent times as processing complexities during production is partly responsible for the high cost of parts and components. Industries such as the heavy machinery consumers, aerospace and casting industry now employs the technology as a way of prolonging service of faulty parts through repair and remanufacturing technology. AM has the tendency to change many production set ups through reduction in cost of production, material wastage, energy usage, component lead time etc. AM technologies also have their own challenges despite numerous advantages associated with them. This paper looks at some of the laser metal deposition techniques, their sustainability and environmental impact.Item Manufacturing of aluminium composite materials: A review. In Hierarchical composite materials: Materials, Manufacturing and Engineering(Walter de Gruyter, 2018) Abdulrahman, K. O.; Akinlabi, E. T.; Mahamood, R. M.Item Metallurgical and Corrosion Property of Additive Manufactured Titanium Alloy-Ti6al4v.(Faculty of Engineering, Department of Manufacturing Engineering / Galati University Press, 2020) Mahamood, R. M.; Marvins, T.; Abdulrahman, K. O.; Shuaib-Babata, Y. L.; Adebisi, J. A.; Akinlabi, S. A.; Hassan, S. E.; Akinlabi, T.Additive manufacturing (AM) is an important manufacturing technology that has changed the way products are designed and manufactured. Laser Metal Deposition (LMD), an AM technology, has the capability of producing components using a 3Dimensional CAD model, through a layer by layer formation process just like any other AM technology. In this study, the influence of the scanning speed on the corrosion property of Titanium alloy-Ti6Al4V using LMD process was investigated. The scanning speed varied between 0.02 m/s and 0.14 m/s while other processing parameters were kept constant. The electrochemical corrosion test was conducted in sodium chloride (NaCl) solution. The result revealed that the corrosion resistance property was found to increase with the scanning speed.Item Microstructural and Mechanical Properties of Failed Coupling with an Airlock in a Flour Mill(IJMET: International Journal of Mechanical Engineering and Technology, 2018) Abdulrahman, K. O.; Adediran, A. A.; Abraham, A.; Abdulkareem, S.; Olawale, I. M.; Yahaya, S. A.In the present work, we report the microstructural and mechanical properties of failed coupling with an airlock in a flour mill. The coupling which was made of aluminium alloy is used to transmit torque from the electric motor to an airlock used on a flour mill production line. The fracture that occurred at the root of the teeth of the coupling was investigated using various tests and analysis. The tests includes: macro examination, micro-structural examination, composition analysis, hardness and tensile test were employed for this investigation. From the tests carried out, it was observed from the macro examination that the coupling undergoes a brittle failure. However, composition analysis revealed a relatively high weight composition of aluminium (87.5 wt. %) suggesting that the coupling was made of aluminium based alloy. The significant presence of Cu and Zn at 2.77 wt. % and 1.03 wt. % respectively indicates that the alloying elements were mainly of copper and zinc. The tensile test result revealed that the material has an ultimate tensile strength of 178 N/mm2 which is comparatively lower than most aluminium alloys. This might be as a result of the high Si composition of 7.24 wt. % observed from the chemical compositional analysis. The hardness result showed the Brinell hardness of the fractured samples as 76.53 BHN. The microstructure of the coupling at three different sections gave three different micrographs, further proving uneven distribution of the aluminium alloy element. Thus, the presence of Si at relatively high percentage, often intended to increase the strength, wear resistance and weldability may be detrimental to the coupling ductility and tensile strength and may have contributed to the early fracture of the coupling.Item Microstructural and Mechanical Properties of Failed Coupling with an Airlock in a Flour Mill.(IAEME, 2018) Abdulrahman, K. O.; Adediran, A. A.; Abraham, A; Abdulkareem, S; Olawale, M. I.; Yahaya, Suleiman AbimbolaIn the present work, we report the microstructural and mechanical properties of failed coupling with an airlock in a flour mill. The coupling which was made of aluminium alloy is used to transmit torque from the electric motor to an airlock used on a flour mill production line. The fracture that occurred at the root of the teeth of the coupling was investigated using various tests and analysis. The tests includes: macro examination, micro-structural examination, composition analysis, hardness and tensile test were employed for this investigation. From the tests carried out, it was observed from the macro examination that the coupling undergoes a brittle failure. However, composition analysis revealed a relatively high weight composition of aluminium (87.5 wt. %) suggesting that the coupling was made of aluminium based alloy. The significant presence of Cu and Zn at 2.77 wt. % and 1.03 wt. % respectively indicates that the alloying elements were mainly of copper and zinc. The tensile test result revealed that the material has an ultimate tensile strength of 178 N/mm2 which is comparatively lower than most aluminium alloys. This might be as a result of the high Si composition of 7.24 wt. % observed from the chemical compositional analysis. The hardness result showed the Brinell hardness of the fractured samples as 76.53 BHN. The microstructure of the coupling at three different sections gave three different micrographs, further proving uneven distribution of the aluminium alloy element. Thus, the presence of Si at relatively high percentage, often intended to increase the strength, wear resistance and weldability may be detrimental to the coupling ductility and tensile strength and may have contributed to the early fracture of the coupling.Item Production of biodegradable composites from agricultural waste: A review.(Walter de Gruyter, 2019) Dada, O. R.; Abdulrahman, K. O.; Akinlabi, E. T.The development of biodegradable composite as an alternative to nondegradable composite continues to wax stronger. Composite materials are materials popularly formed from the combination of matrix and reinforcements, where one of these is commonly from renewable sources. However, biodegradable composites are produced from the combination of matrix (resin) and reinforcement solely from natural fibers unlike ordinary composites that do contain synthetic polymers which are not biodegradable. Thus, studies are continued to produce biodegradable composites using different biodegradable materials and techniques. Recent activities have led to the development of biodegradable composites with reasonable tensile and flexural characteristics. However, there are shortfalls with regard to some of the biodegradable composites when they come in contact with moisture, which affects their performance under certain conditions as in aqueous medium or under high humidity. Notable works have come up with biodegradable composite materials from common agricultural wastes. Among the common materials that have been studied in the development of biodegradable composites are rice husk, soybean, sugarcane bagasse, and cassava peel. This chapter discusses some of the literature available on biodegradable composites developed mainly from common agricultural products, their properties, production method, challenges, and sustainability.Item Static fatigue analysis on the load container of a low-cost vehicle for Nigerian rural farmers(NIJOTECH: Nigerian Journal of Technology, 2018) Yahaya, S. A.; Abdulrahman, K. O.Static fatigue analysis was done on the container of a model of low cost vehicle for Nigerian rural farmers to determine how well the container has been designed and its resistance to notable deformation or damage, based on the load it was subjected to. The s tatic analysis performed involved the fixing of the container in areas where it is made to rest on the chassis. Finite element analysis of the vehicle container was conducted in two loading conditions. The result from the analysis gave a factor of safety o f 4 . 3 6 f o r t h e l o a d c o n t a i n e r a t a m a x i m u m displacement of 0.131 mm and a factor of safety of 4.65 for the load container and a maximum displacement of 0.136 respectively for the two loading conditions. These maximum displacements, which can be negligible shows that the load container is well designed as the maximum stresses are above the hand calculated maximum stresses.