Browsing by Author "Busari, Yusuf Olanrewaju"

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    Development and Evaluation of Land Use Planning Framework Based on Major Accident Hazard Facility
    (2019) Qaeem, M; Rashid, Z.A; Babamale, Halimah Funmilayo; Busari, Yusuf Olanrewaju; Alizada, Amir M
    The identification of more hazard facilities with respect to land use planning (LUP) to solve the adverse consequences that threatens nature and human life. There is an urgent need for better understanding of the current regulations and frameworks of major hazard facility (MHF) siting in order to adapt a strategic approach for LUP and preventing major accident hazards. This research aims to develop a checklist/framework to study LUP- MHF and validate its effectiveness with practical use in LPG’s site planning. The results of applying this checklist in five LPG siting facilities in Malaysia which stored more than 50 tons in their premises and comparison with various standard of consequence-based method (CBM) applied from several countries show that most of the receptor below 100 m will be exposed to high lethality. However, degree of lethality is reduced when the distance of the receptor is increased. Based on results, French method is more stringent compared to Italy and Malaysia. According to findings from library – based research and practical use of developed checklist/framework in MHF-LUP, the Malaysia method is similar to UK standards that should be revised because there is increasing of 6.67% of the people around the LPG vicinity that could be mentioned as unsafe. The research suggested that to impose additional criteria in between 4 - 12.5 kW/m2 as practiced currently in Malaysia. The iterative cycles of evaluation and assessing the consequences of a number of scenarios, which then serve as a reference for the determination of protection zones around the installation is also suggested to avoid Domino-Effect
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    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 Lanre
    This 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.
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    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 Lanre
    This 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