Browsing by Author "Ajayi, J. A."

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NEED-DRIVEN MANPOWER DEVELOPMENT FOR THE METALLURGICAL AND MATERIALS INDUSTRY BY ENGINEERING CURRICULUM RESTRUCTURING
(2009) Oluwole, O. O.; Ajayi, J. A.; Olaniran, O.
Development and enhancement of innovative engineering curriculum is a vital exercise in producing well grounded graduates that can perform in today's world. In this paper, two existing models on developing metallurgical engineering curriculum were outlined: The Russian model where there is early specialization to meet national interest and the western model where there is emphasis on acquiring basic engineering principles with some form of introduction to specializations in the senior year. The merit and/or demerits of the two models were discussed. In developing undergraduate metallurgical engineering cuuriculum, it was adjusted best to strike a balance between the future of the student (academics and job), the needs of the employer and the nation for reasons of academic progression, job safety and global relevance.
Simulation studies of shear stresses in reinforced and non-reinforced concrete structures
(2009-06) Akindahunsi, A. A.; Ajayi, J. A.; Oluwole, O.
A simulation study of the shear stresses in non-reinforced and reinforced structures was carried in this work. Using the finite element method and equations of elasticity, columns and concrete deck of a simple storey structure were subjected to plane strian conditions. The results showed that proper reinforcement causes stresses to be directed into the reinforcements with the resultant transverse shear at critical joints of the structure. In the insufficiently reinforced member, the resultant shear of the concrete resulted in load transfered to the reinforcement itself with the resultant buckling of reinforcement and eventual collapse of structure.
Texture and structure of cold-rolled and temper annealed sheet of aluminium 1200
(2002) Oluwole, O.O; Ajayi, J. A.; Olorunniwo, O. E; |Sofoluwe, O.
Aluminium 1200 is the grade of aluminium used for hollowares. It is the good corrosion resistance and ductility of Aluminium 1200 that made it particularly suitable for hollowares. However, there is a need to control the texture of aluminium sheet to be cold rolled in order to obtained optimal condition favourable for metal drawing. This is the rationale for this work. The effect of annealing and cold rolling on texture and struture of Aluminium 1200 sheets has been established. Working on cold rolled reductions of 80%, 84%, 86, 88%, and 92% and annealing temperature of 350C, 400C and 480 C, for 1hrs and 3hrs, Planar and normal anisotropy (that is, measure of crystallographic texture) were calculated from a known relationship. Samples of 80% cold-rolled reduction and heated to temperature 35C for three (3) hours showed the most favourable texture for metal drawing. Thus, crystallographic texture has been found to be determined by the average normal and planar anisotropy of Aluminium 1200 sheet metal which can be controlled by the annealing temperature and degree of previous cold- working. Texture with very low value of average anisotropy (about unity) has been found suitable for aluminium 1200 metal sheet drawing. Although annealing is observed to enhance the preferred orientation for metal drawing, there is the need to control the grain growth associated with it, which can impair the mechanical properties of the sheet.