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- ItemVehicle bumper fascia prototyping using sustainable nanocomposites(2025) Sefiu Adekunle Bello; Sodiq Olamide Olaitan; Mohammed Kayode Adebayo; Lateef Olayinka Akinwande; Funsho Olaitan Kolawole; Maruf Yinka Kolawole; Abdulmumuni Ariboh Suberu; Fawaz Afolami Arowoduye; Muhiz Akangbe; Roseline Ifeoluwa Michael; Timothy AdeyiEggshells and date seeds are wastes which contribute to land pollution. Their conversions to useful materials are important to save the environment from the health hazards associated with rotten eggshells and possible impacts from the date seed wastes. This study focuses on conversion of eggshells and date seeds into reinforcing particles for producing sustainable polymeric and metallic nanocomposites for prototyping a vehicle bumper fascia. Eggshell nanoparticles were incorporated into low-density polyethylene up to 12 wt%. Metallic nanocomposites were produced using Al–Cu–Mg sourced from aluminium alloy scraps and date seed particles and then, heat treated. The developed nanocomposites were analysed chemically, structurally, and mechanically. The structural integrity of the polymeric nanocomposites was confirmed by the scanning electron microscope. Enhancements in impact energy, tensile and flexural strengths at 12 wt% of eggshell nanoparticle additions to the very low-density polyethylene are 1.5, 110.4 and 47.7 %, respectively. 1 wt% date seed particle reinforced Al–Cu–Mg that has highest impact energy after annealing treatment is selected for the mould parts fabrication for forming the bumper fascia. Property comparison of the produced polymeric nanocomposites with those of existing bumper fascia materials affirms that the tensile strength and impact energy of the nanocomposite that contains 12 wt% eggshell nanoparticles are suitable for the automobile bumper fascia. Hence, fabrication of the bumper fascia using the VLDPE/12 wt% eggshell nanocomposite was fruitful.
- ItemImproving mechanical properties of aluminium alloy through addition of coconut shell-ash(1970) A. Apasi; D. S. Yawas; S. Abdulkareem; M. Y. KolawoleThis paper investigates the microstructure and mechanical properties of aluminum alloy (Al-Si-Fe) reinforced with coconut shell-ash particulate. The aluminium (Al-Si-Fe) alloy composite was produced by a double-stir casting process at a speed of 700 rpm for 10 and 5 minutes at first and second stirring respectively. The samples produced from addition of 0-15 wt% coconut shellash particles (CSAp) were prepared and subjected to microstructural and mechanical properties testing. The results of the microstructural analysis of the composite reveal a fairly uniform distribution of the coconut shell-ash particles in the matrix with increase in volume fraction of CSAp. The mechanical property test results revealed that, hardness of the developed composite increased with increasing percentage weight of CSAp. Also the tensile and yield strength at 0.2% offset values of Al-Si-Fe/CSAp composite increased with percentage increase in CSAp up to 9% addition above which a little decrease in both tensile and yield strength was observed.Keywords: Matrix, coconut shell, mechanical properties, stir- casting, particulate, reinforcements
- ItemINFLUENCE OF BIO-SHELLS ADDITION ON THE MECHANICAL PROPERTIES OF ALUMINIUM ALLOY(International Journal of Mechanical and Production Engineering, 2019) AWEDA, J.O.,; KOLAWOLE, M.Y.; ABDULKAREEM, S.Bio-wastes materials generation is on the increase and technology has made it possible for use as additives to other materials in order to improve mechanical properties of such materials. Snail and sea shells, regarded asbio-remnants, obtained from eateries and beaches normally constitute environmental nuisance when the shells are discarded after the consumption of the flesh. These bio-shell wastes were used as reinforcement materials in aluminium metal matrix composites (MMCs). The mineralogical compositions and other physical properties of the shells were carried out using thermo gravimetric analysis (TGA), Scanning Electron Microscopy/Energy Dispersive X-ray (SEM/EDS) and X-ray fluorescent (XRF). The density and mechanical properties of the specimens as determined at varying % wt addition of the bio-shells’ powder to aluminium showed a significant improvement in properties. There was increase in hardness and tensile strengths with a recorded decrease in density when the shells’ powder was addedto aluminium alloy.
- ItemEFFECT OF DATE SEED PARTICULATES ON MECHANICAL PROPERTIES OF ALUMINIUM ALLOY(A CTA TECHNICA CORVINIENSIS – Bulletin of Engineering, 2018) S. ABDULKAREEM; E.J. EDACHE; I.I. OLOWOSULE; M.Y.KOLAWOLE; I.I. AHMED; T.K. AJIBOYEThe results of an experimental investigation of mechanical properties of date seed particles reinforced aluminium alloy composites, processed by stir casting method are reported in this paper. Two sets of composites with date seed of 300 and 500 μm particle sizes were used. The ranges of particle size used were based on the weight fraction when sieve analysis was conducted on the sample collected for the work. Each grain size had four types of composite samples with the reinforcement weight fractions of 5, 10, 15 and 20%. The mechanical properties considered were the tensile strength, Impact and hardness behaviors. Unreinforced aluminium alloy samples were also tested for the same properties. It was found that the hardness and tensile strength increases with the increase in the weight fraction and the fracture toughness decreases with increase in the weight fraction of reinforced date seeds particles. It was concluded that the improvement in the mechanical properties can be well accredited to the high dislocation density.
- ItemExperimental investigation on enhancing the mechanical properties of biodegradable Zn-3Mg alloys reinforced with snail-shell particulates via powder metallurgy(2025) Maruf Yinka Kolawole; Sana Anwar; Esra Bozkaya; Asli Gunay Bulutsuz; Siyami Karahan; Hakan Yilmazer; Farasat IqbalAbstract Biodegradable zinc-based alloys are promising candidates as a new generation implant materials due to their favorable degradation rates compared to magnesium and iron. However, their relatively low mechanical strength hinders their clinical usage. In this experimental study, Zn–3Mg/xSnS ( x = 0.5–6 wt%) composites were manufactured via powder metallurgy. The performance of the obtained samples was systematically investigated via microstructural analysis (SEM), mechanical properties (compressive yield strength, elastic modulus, and hardness), in vitro degradation, and cytocompatibility with L929 fibroblast cells. According to the obtained results, SnS reinforcement significantly improved mechanical performance. Microstructural investigation revealed homogeneous SnS distribution and refinement of intermetallic phases. Among all the sample groups, Zn–3Mg–2SnS resulted in a compressive yield strength of 402 MPa, elastic modulus of 49 GPa, and hardness of 151 HV. Degradation tests were performed for 28 days, and the samples exhibited a moderate corrosion rate ( ~ 0.2 mm/year). Cytotoxicity assays confirmed >70% cell viability at 50% extract concentrations. These results show that Zn–3Mg alloys can be efficiently reinforced with bio-derived SnS particles, improving their strength and biocompatibility without decreasing their degradation performance. Graphical Abstract