- Mechanical Engineering Department, Nigerian Defence Academy, Kaduna
- 08035894428
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A comparative assessment of mechanical behaviour of groundnut shell and rice husks as reinforcement in epoxy matrix has been investigated in this work. Six specimen each of groundnut shell reinforced epoxy and rice husk reinforced epoxy... more
A comparative assessment of mechanical behaviour of groundnut shell and rice husks as reinforcement in epoxy matrix has been investigated in this work. Six specimen each of groundnut shell reinforced epoxy and rice husk reinforced epoxy composites having 2.5%, 5%. 7.5%, 10%, 12.5% and 15% content of groundnut shell and rice husk were produced using the hand lay up technique and their mechanical properties (impact strength, hardness, flexural strength and tensile strength) were evaluated. The highest mechanical properties of the groundnut shell reinforced epoxy composites were: impact strength (7.91 J/mm 2 at 12.5%), hardness (7.8 HRF at 5%), flexural strength (43.43 N/mm 2 at 12.5% ) and tensile strength (41.60 N/mm 2 at 2.5%) while the highest mechanical properties for the rice husk reinforced epoxy composites were: impact strength (4.91 J/mm 2 at 7.5%), hardness (8.7 HRF at 2.5%), flexural strength (28.21 N/mm 2 at 5%) and tensile strength (16.67 N/mm 2 at 5%). Results of this res...
Defence Industries Corporation of Nigeria (DICON) has compared the effect of Tungsten Inert Gas (TIG) and Oxy-Acetylene welding methods on microstructural and some mechanical properties of Armour plate for the modification of military... more
Defence Industries Corporation of Nigeria (DICON) has compared the effect of Tungsten Inert Gas (TIG) and Oxy-Acetylene welding methods on microstructural and some mechanical properties of Armour plate for the modification of military troop carriers. The optical emission spectrometer (OES) at DICON was used to analyse the chemical composition of the armour plate strip. It was then machined and cut to various test piece dimensions for both welding processes, following which the weldment samples were subjected to post-weld mechanical tests (tensile, impact, and hardness) and metallographic examination. The samples were then welded according to the procedure outlined in this study. The fundamental composition of armour plates was preserved in the samples. When compared to Oxy-Acetylene (OA) welding, Tungsten Inert Gas (TIG) welding produced better results, with an average ultimate strength (UTS) of 603.52 MPa and an impact strength of 10.53 J. In addition, the TIG analysis hardness str...
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Polymer matrix composites have been developed in this work using fibre glass (E-class) with epoxy resin and various grades of amine as curing agents. The polymer matrix composites were produced from two fibres (fibre glass and... more
Polymer matrix composites have been developed in this work using fibre glass (E-class) with epoxy resin and various grades of amine as curing agents. The polymer matrix composites were produced from two fibres (fibre glass and 3-dimensional cotton fabrics) and epoxy resins. The epoxy resin was produced by dissolving a measured quantity of solid and liquid bisphenol-a-co-epichlorohydrine in Acetone. Three different amines (diethylenetriamine (DETA), triethylenetetramine (TETA) and tetraethylene pentamine (TEPA)) were used as curing agents for the production work. The composites developed were subjected to tensile and hardness tests. The mechanical strength obtained is dependent on the grade and type of fibre used, the amine/epoxy ratio, epoxy/fibre weight ratio, thickness of the fibre and the use of additives as property modifiers. The results obtained showed that the tensile strength increases as the ratio of amine to epoxy ratio increases up to an optimal ratio of 0.17 when tetraet...
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The morphology and mechanical properties of coconut shell reinforced with epoxy resin composite have been evaluated to establish the possibility of using it as a new material for engineering applications. Coconut shell reinforced... more
The morphology and mechanical properties of coconut shell reinforced with epoxy resin composite have been evaluated to establish the possibility of using it as a new material for engineering applications. Coconut shell reinforced composite was prepared by compacting epoxy resin matrix with 10% 30% volume fraction coconut shell fibres and the effect of the fibres on the mechanical properties of the composite produced was investigated. The result shows that the hardness and tensile strength of the composite increase with increase in coconut shell fibre content while impact energy of the composite decreases with increase in the fibre content. Initially, the toughness was observed to increase as the ratios of fibre/epoxy and amine/epoxy increase but later dropped due to the presence of coconut shell powders which precipitate out of the solution and produce a weak composite. The prepared composite has an average hardness number of 54.51 DHN. The average impact strength is 60Joules/mm. Sc...
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The research aimed to evaluate the performance of neem seed oil as a cutting fluid in orthogonal machining of aluminium-manganese alloy 3003, carbide cutting tool insert was used as a cutting tool under different machining parameters of... more
The research aimed to evaluate the performance of neem seed oil as a cutting fluid in orthogonal machining of aluminium-manganese alloy 3003, carbide cutting tool insert was used as a cutting tool under different machining parameters of spindle speed, feed rate and depth of cut with different types of cutting fluids (neem seed oil and soluble oil) as well as dry machining. The results were obtained in terms of the average surface roughness of the machined workpiece and flank wear under different cutting parameters (spindle speed, feed rate and depth of cut). The results indicated that the neem seed oil cutting fluid reduced the surface roughness by 39% and 22% as compared to dry turning and soluble oil cutting respectively. It was established from the results that the neem seed oil cutting fluid reduced the flank wear by 72% and 56% as compared to dry turning and soluble oil cutting respectively. Based on the study, it can be concluded that neem seed oil cutting fluid facilitates a ...
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ABSTRACT: The present work is on the development of roofing sheet material using groundnut shell particles and epoxy resin as composite material. Three different samples of roofing sheets “A”, “B ” and “C ” were prepared and produced from... more
ABSTRACT: The present work is on the development of roofing sheet material using groundnut shell particles and epoxy resin as composite material. Three different samples of roofing sheets “A”, “B ” and “C ” were prepared and produced from three different weight particle length sizes of 0.5mm, 1mm and 1.5mm at a weight ratio of 70:30 between epoxy and groundnut shell. The sample roofing sheets were cast manually and the rate of water absorption, tensile strength, impact and flexural strength due to bending and deflection were all experimentally evaluated. The sample specimen A with a particle length of 0.5mm have the lowest rate of water absorptivity value of 8.3 %,with the highest impact value of 29.65KJ/m 2. Likewise sample B with a particle length of 1mm have the highest ductility and tensile strength of 2.356mm and 8.25N/mm 2 respectively. The results revealed that Groundnut shell particles can be used as reinforcement for polymer matrix for the production of roofing sheets. Samp...
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An experimental analysis of SAN-armour steel plate subjected to high velocity impact of 0.30 calibre armour piercing projectiles is presented. The hardness and impact strength of the plate were assessed following standard procedures;... more
An experimental analysis of SAN-armour steel plate subjected to high velocity impact of 0.30 calibre armour piercing projectiles is presented. The hardness and impact strength of the plate were assessed following standard procedures; while microstructural examination was carried out on etched sample of the plate. The
ballistic performance of the 6 mm thick steel was examined, to obtain an estimate for the V50 ballistic test for armour steel plate, impacting projectiles at 30° obliquity to the target plate from 20 m range. The observed performance was compared with the requirements ofMIL-STD-46100E standards. The results showed that the specimen tested has a tensile strength of 1290MPa, hardness value of 483HBN, 10.1% elongation, impact resistance value of 27J, and that the morphology of the original microstructure has martensitic/bainitic matrix. The ballistic performance of the plate agreed with the minimum ballistic requirements of MIL-STD-
46100E standards. This study, therefore established that the SAN armour steel plate is effective for anti-ballistic applications
ballistic performance of the 6 mm thick steel was examined, to obtain an estimate for the V50 ballistic test for armour steel plate, impacting projectiles at 30° obliquity to the target plate from 20 m range. The observed performance was compared with the requirements ofMIL-STD-46100E standards. The results showed that the specimen tested has a tensile strength of 1290MPa, hardness value of 483HBN, 10.1% elongation, impact resistance value of 27J, and that the morphology of the original microstructure has martensitic/bainitic matrix. The ballistic performance of the plate agreed with the minimum ballistic requirements of MIL-STD-
46100E standards. This study, therefore established that the SAN armour steel plate is effective for anti-ballistic applications