Browsing by Author "Shambel Dibaba"

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    Fabrication And Evaluation of Mechanical Properties of The Hybrid Coffee Husk and Enset Fiber-Epoxy Reinforced Composites
    (Addis Ababa University, 2023-06) Shambel Dibaba; Desalegn Wogaso (PhD)
    in modern times there is a growing concern about replacing polluting and not recyclable synthetic fibers, as well as rare wooden fibers, with sustainable lignocellulose fibers derived from agricultural leftovers for reinforcement bio-composites. Currently in Ethiopia, the accident rate of vehicles on the road is increasing. Along with that, Vehicle security is a significant topic of study to safeguard. not only structures but also occupants in the event of a crash. In the other side the fast increase of population and development of cities required demand for transport, hence to full fill the demand recently the vehicles are imported in large amounts at the same time which requires accessory’s for replacement of their parts, so the front bumper of those vehicle is the most parts demanded due to it is the most exposed part during crash. The Enset fiber and coffee husk were collected from Ethiopia's Southern Nations, Nationalities, and People's Region (SNNPR) Gedeo zone, Yirgachefe district. Sun-dried Eset and coffee husk were treated with a 5% sodium hydroxide mixture to remove more cellulose, hemicellulose, lignin, and additional fiber chunks to increase binding and facial shear strength. Following that, Enset-coffee husk fibers reinforced hybrid composite was created utilizing a hand layup method on the 40-60%, 30-70%, and 20-80% fiber weight percentages of matrix weight to total fiber volume. Tensile, compressive, its impact, flexural, and absorbance of water tests were then performed to determine which constituent of the composite had higher strength under load. While the mechanical and physical properties of the composites were assessed, the composite C5 with E20%-CH10%-E70% possessed the best mechanical and physical properties, with a tensile strength of 43.30MPa, flexural strength of 93.38 MPa, compression strength of 21.23MPa, impact energy of 3.5J, and water absorption percentage of 3.55%. In addition, the front bumpers was modeled in ANSYS 19.2 and composite C5, yielding an optimal von missed stress of 39.119MPa and distortion of 15.09mm. According to the findings and analyses, the chosen Enset-Coffee husk-Epoxy hybrid composite might be explored subsequently as a low-speed crash replacement material for the front bumper.