Browsing by Author "Shuaib-Babata, Yusuf Lanre"
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Item Assessment of physico-mechanical properties of clay deposits in Asa local government area of Kwara State Nigeria for industrial applications(Department of Civil Engineering, University of Ilorin, Nigeria, 2019) Shuaib-Babata, Yusuf Lanre; Ambali, i. i.; Ibrahim, H. K.; Ajao, K. S.; Elakhame, Z. U.; Aremu, N. I.; Odeniyi, O. M.Adequate information about the properties of most available clay materials in Nigeria is necessary to enhance their industrial applications. Availability of this information will adversely reduce importation of refractory materials and its products into the country, since the mineral resources are abundantly available in the country. This study evaluated the chemical and physico-mechanical properties of some selected clay deposits across the three districts of Asa Local Government Area (LGA) of Kwara State to ascertain their suitability for refractory and other industrial applications. The results revealed that the clay samples were mainly alumina-silica based with silica and alumina concentrations of 47.30 – 58.50% and 32.75 – 34.30% respectively. The physico-mechanical properties exhibited by the clay samples included: clay content (33.80-72.20%), linear shrinkage (6.10-9.80%), moisture content (21.00-33.00%), bulk density (1.99 - 2.87 g/cm3), apparent porosity (21.00-37.00%), permeability (73-94), compressive strength (213-840 N/mm2), thermal shock resistance (+29 cycles), specific gravity (2.18-2.52) and refractoriness (>1300oC). The properties were within the required standard values which make the clays suitable for insulating materials, refractories for low-medium thermal applications and Shuaib-Babata USEP: Journal of Research Information in Civil Engineering, Vol.16, No.2, 2019 et al 2728 manufacturing of ceramics. Though, Afon, Bakase and Ballah clay samples may require the addition of organic matter to enhance the clays’ suitability for applications that may require a higher value of porosity and permeability and low density. Effective utilization of Asa L.G.A. clays will help to domesticate the production of refractory products and enhance the establishment of Small and Medium Scale Foundry Enterprises in Nigeria in addressing the problem of unemploymentItem Effect of Heat Input on the Mechanical and Corrosion Behaviour of Smaw Mild Steel(University of Novi Sad, Serbia, 2017-11-29) Busari, Yusuf O.; Ahmed, Ismaila Idowu; Shuaib-Babata, Yusuf LanreThis study was carried out to assess the effect of heat input on the mechanical properties and corrosion behaviour of mild steel. The intrinsic nature of fusion welding has made it difficult to provide a complete understanding of corrosion behaviour in some systems. Optical metallography was used to determine grain size and HAZ zone, weldment and parent metal. Mechanical properties of the weldment were observed. Corrosion behaviour of mild steel were investigated in air, sea water, alkaline and acidic medium after welding with shielded metal Arc welding SMAW by varying the welding process parameter that leads to power input and monitoring its welding speed with a stop watch. The microstructural characterization of the welded sample carried out through a metallurgical microscope (x100) and the corrosion response rate by weight loss was observed in the different medium, the sample welded with 180A and low voltage displayed the highest Rockwell hardness and the same was observed for impact test. The effect of various heat inputs on the corrosion behaviour of shielded metal arc welded mild steel show thus the as-received sample have the greatest resistance to corrosion in all the medium, at 180 A, high voltage this is closely followed by sample welded with 180 A, low voltage. The sample welded with 90A, low voltage which has the least corrosion resistance in all medium during the exposure period studied. The low heat input welded samples underwent a long period of heating, low heat input could lead to a greater tendency of distortion which may produce a higher weld cracking in the aggressive corrosion medium. The higher the current, the higher the power input and the deeper the penetration. However, the use of too high weld current may cause problems such as excessive spatter, electrode overheating and cracking while too high weld voltage could cause the beads to be wider and flatter. The low arc voltage produces a stiffer arc that improves penetration. If the voltage is too low, a very narrow bead will result.Item Effect of heat input on the mechanical and corrosion behaviour of SMAW mild steel(Journal of Production Engineering, 2017) Busari, Yusuf Olanrewaju; Ahmed, Ismaila Idowu; Shuaib-Babata, Yusuf LanreThis study was carried out to assess the effect of heat input on the mechanical properties and corrosion behaviour of mild steel. The intrinsic nature of fusion welding has made it difficult to provide a complete understanding of corrosion behaviour in some systems. Optical metallography was used to determine grain size and HAZ zone, weldment and parent metal. Mechanical properties of the weldment were observed. Corrosion behaviour of mild steel were investigated in air, sea water, alkaline and acidic medium after welding with shielded metal Arc welding SMAW by varying the welding process parameter that leads to power input and monitoring its welding speed with a stop watch. The microstructural characterization of the welded sample carried out through a metallurgical microscope (x100) and the corrosion response rate by weight loss was observed in the different medium, the sample welded with 180A and low voltage displayed the highest Rockwell hardness and the same was observed for impact test. The effect of various heat inputs on the corrosion behaviour of shielded metal arc welded mild steel show thus the as-received sample have the greatest resistance to corrosion in all the medium, at 180 A, high voltage this is closely followed by sample welded with 180 A, low voltage. The sample welded with 90A, low voltage which has the least corrosion resistance in all medium during the exposure period studied. The low heat input welded samples underwent a long period of heating, low heat input could lead to a greater tendency of distortion which may produce a higher weld cracking in the aggressive corrosion medium. The higher the current, the higher the power input and the deeper the penetration. However, the use of too high weld current may cause problems such as excessive spatter, electrode overheating and cracking while too high weld voltage could cause the beads to be wider and flatter. The low arc voltage produces a stiffer arc that improves penetration. If the voltage is too low, a very narrow bead will result.Item Numerical Analysis of Single Edge Notched Tension Specimen with Fatigue Crack Parameter of Conventional Specimen Using Linear Elastic Fracture Mechanics(International Journal of Integrated Engineering, 2021-09) Busari, Yusuf Olanrewaju; Manurung, Yupiter H.P.; Abdullah, Shahrum; Shuaib-Babata, Yusuf LanreThis paper describes the numerical analysis of planar crack growth in high strength steel API 5L X70 whose crack growth parameter is adopted from experimental compact tension (CT) specimen in previous literature. Apart from the fact that conventional fatigue crack growth specimen has bogus geometry constraints, the Single Edge Notched Tension (SENT) better replicate the crack-tip constraint conditions experienced in structures. Linear elastic fracture mechanics (LEFM) crack orientation is modelled with the finite element method in SENT model considering its geometry functions a/W ratio to determine its crack growth rate based on constant amplitude load. The virtual crack closure technique tool in MSC Marc/Mentat software with adaptive and global remeshing is applied to assess high cycle fatigue crack propagation using the SENT model. The crack growth pattern for the 3-dimensional simulation characteristics is similar with that of the CT Specimen experimental procedure. Furthermore, the results of the crack propagation and the cycle count demonstrated good agreement with bearable discrepancy with maximum percentage difference of about 14.1 % for the HAZ and 6.4% for the weld and parent metal compared to the experimental results from literature