Mechanical Engineering

Permanent URI for this collectionhttp://197.211.34.35:4000/handle/123456789/152

Mechanical Engineering

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Author: search.filters.author.Obanimomo, K.T.

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    Investigation of Fracture behaviour of API X70 Pipeline Steel
    (IOP Publishing Ltd, 2021) M.S. Egene,; O. Adedipe,; U.G. Okoro,; Obanimomo, K.T.
    Oil and gas production has significantly increased over the years in order to meet future demands for oil and gas products, regardless of the unstable price being experienced by producing nations. The use of pipelines for the transportation of these products has been the globally recognized solution. These pipelines are fabricated by welding and their fracture properties depend on a number of factors which include temperature, particularly for pipelines operating in cold environment such as deeper water depths. Therefore, information of fracture behaviour of welded pipelines located in cold regions is therefore important for reliable design for service. In this paper, fracture behaviour of welded x70 pipeline steel was investigated using charpy v-notch specimens. Impact tests were carried out on weld and parent materials at temperatures -10°C, -20°C, -40°C, -60°C, -80°C, -100°C, -120°C, -160°C, 0°C, 10°C and 20°C. Results revealed that higher energy was absorbed in the weld than in parent materials regardless of the test temperature used. results implied that the fracture behaviour of the material could be significantly influenced by temperature, welding and the notch sensitivity of the materials.
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    Effect of Process Parameters on Surface Roughness and Kerf Width of Mild Steel during Plasma Arc Cutting Using Response Surface Methodology
    (Faculty of Engineering, Federal University Oye-Ekiti, 2020-03-19) Agbonoga, E.A.; Adedipe, O.; Okoro, U.G.; Usman,. F.J.; Obanimomo, K.T.; Lawal,. S.A.
    This study investigated the effects of process parameters of plasma arc cutting (PAC) of low carbon steel material using analysis of variance. Three process parameters, cutting speed, cutting current and gas pressure were considered and experiments were conducted based on response surface methodology (RSM) via the box-Behnken approach. Process responses viz. surface roughness (Ra) and kerf width of cut surface were measured for each experimental run. Analysis of Variance (ANOVA) was performed to get the contribution of process parameters on responses. Cutting current has the most significant effect of 33.43% on the surface roughness and gas pressure has the most significant effect on kerf width of 41.99%. For minimum surface roughness and minimum kerf width, process parameters were optimized using the RSM
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    Tribological Properties of Canarium Scweinfurthii Shells as Frictional Material for Automotive Brake System
    (JOURNAL OF SCIENCE TECHNOLOGY AND EDUCATION, 2020-12-04) Ibeh, C.S.; Jiya, J.Y.; Adedipe, O.; Usman. F.J.; Obanimomo, K.T.; Amuda, J.B.
    Friction material for automobile braking system was developed using canarium schweinfurthii shell (CSS) otherwise known as African elemi. Tribological properties such as thermal conductivity, water/oil absorption test, coefficient of friction, wear rate, hardness test, porosity, compressive and tensile strength, temperature, noise level generated and stopping time-varying speed from 5.56 – 27.78 m/s that directly or indirectly affect brake pad system were investigated. Experimentally developed brake pads (using CSS) were found to compete favourably with conventional brake pads and those from literature studies. The research finding using CSS indicates that CSS particle can effectively and efficiently replace asbestos in brake pad manufacturing.