Department of Metallurgical and Materials Engineering

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Browsing Department of Metallurgical and Materials Engineering by Author "Adeyemo, R.G."

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    Open Access
    Flexural Performances of Epoxy Aluminium Particulate Composites
    (ENGINEERING JOURNAL, 2018) Bello, S.A.; Agunsoye, J.O.; Adebisi, J.A.; Raji, N.K.; Adeyemo, R.G.; Alabi, A.G.F.; Hassan, S.B.
    Polymers are characterised with lightness, ease of formability and resistance to chemical attack but their modulus and strength are low. Epoxy was reinforced with aluminium particles of different sizes. Bond, functional group and chemical formulae of the composite phases were examined using Fourier Transform Infrared Spectroscopy (FTIR) and X-ray diffractometer. The flexural test was also conducted on the developed composites via three-point method. Analysis of variance (ANOVA) was performed using aluminium percentage by weight (wt%) and sizes (Ps) as the predictor variables. Results indicated different chemical formulae of the composite phases. A maximum of 124.44 % increase in flexural modulus was found at 12 wt% reinforcement addition. Probability value, 0.000 for each of wt% and Ps affirm evenly significant influence of both variables on flexural modulus of the composites. Hence, the developed multiple regression model can be used for predicting the flexural modulus of epoxy particulate composites within and outside the scope of experiment
  • Item
    Open Access
    Optimization of tensile properties of epoxy aluminum particulate composites using regression models
    (Journal of King Saud University – Science, 2018) Bello, S.A.; Agunsoye, J.O.; Adebisi, J.A.; Adeyemo, R.G.; Hassan, S.B.
    Aluminum particles (sourced from aluminum can wastes) were incorporated into diglycidyl ether of bisphenol A (DGEBA) cured with 1,3-diethanamine benzene hardener. Phases occupying the infusible cross linked-developed epoxy composite structures were identified and their spatial arrangements were also examined. The mechanical property tests conducted on the developed epoxy composites include tensile, flexural, impact toughness and micro hardness tests. The density of the epoxy composite sample was determined using Archimedes’ principle. Regression models were developed, confirmed and validated to appraise effects of aluminum particle sizes and percentage weight on the tensile strength. XRD results indicated a chemical reaction between epoxy system and aluminum particles. There is a fair homogenous distribution of the second phase particles within the developed epoxy structure. Deductions from mechanical property tests revealed epoxy/10% aluminum nanoparticle composite (E/10%Alnp) having optimal tensile strength of 18.58 Nmm 2 with flexural strength of 130.87 Nmm 2, impact energy of 16.30 J and micro hardness value of 12.03 HV. The mechanical property values of E/10% Alnp Nanocomposite are comparable with those of existing bumper materials. Moreover, the regression models agree with experiments.