DEPARTMENT OF MECHANICAL ENGINEERING

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End date: 2009Subject: search.filters.subject.mild steel

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    Effects of cassava juice on corrosion of mild and high yield steel bars in concrete structures
    (2009-03) Oluwadare, G. O.; Akindahunsi, A. A.; Oluwole, O.; Agbaje, I. A
    Nigeria is the highest producer of cassava in the world and cassava juice is rich in hydrocynic acid, a by-product from the extraction process. This paper examines the effect of cyanide ions, the reacting ions from hydrocyanic acid on reinforcing bars when cassava tubers are processed on reinforced concrete palteforms. Mild and high yield steel reinforcing bars are embedded in concrete cubes cast and cure for 21 and 28 days. These steel bars were used to model the experiment. Half-cell potential apparatus was used to take potentials measurement of both steel bars with concrete cubes immersed in hydrocyanic acid and ordinary water for 32 days. Corrosion rates under these different conditions were monitored. The results demostrated that both steel types will corrode in hydrocynaic acid, however, high yiled steel has better corrosion resistance than mild steel: this is due to the mechanical properites and chemical composition of the steel. It was also observed that with increase in curing age the degree of probability of corrosion decreased.
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    Stress loops effect in ductile failure of mild steel
    (2009) Oluwole, O. O.
    A simulation study of effect of stree on mild microstructure has revealed stress loops at areas of stress application which are believed to be the root cause of the ductile failure morphology (cup and cone) in ductile alloys under plane strain conditions. The area of concerntration of these stress loops were obsrved to be that of subsequent instability (or necking) observed in mild steel and other materials of low friction (flow) stress. Shear stress loops with angular bearing of 45 o to the tensile axis were observed to instigate both the failure site and shear morphology in these materials. In plane stress conditions, shear was seen to be that of a wave shape running obliquely to area of stress application resulting in oblique necking observed in thin mild steel sheets.