Samuel, Tesfaye (PhD)Fasil, Henok2022-07-162023-11-182022-07-162023-11-182022http://etd.aau.edu.et/handle/12345678/32253Recently natural fiber composites are overtaking the place of synthetic fiber composites for many applications, so it seems crucial to model interfacial shear strength of it and study the load transfer efficiency between the fiber and the resin, which plays a significant role in determining the mechanical properties of the fiber reinforcement which the is fiber-epoxy matrix. In this paper two fiber; Pineapple fiber and kapok, which has the highest and lowest young’s modulus are chosen. Twelve models, six for each kind of fiber, are developed using ABAQUS software considering different conditions, such as various fiber embedment lengths, fiber diameter, and void sizes for fiber pullout failure of the interface between the fibers and epoxy. Parameters studied are fiber embedded length of 3 mm and 0.1 mm; fiber diameter 48 for pineapple and Kapok fiber with a length of 1mm and 0.1 mm with a diameter of 33 is taken. The effect of the presence of voids on the interface of fiber and epoxy is studied. The average interfacial shear strength obtained, between epoxy and fiber interface, are for pineapple and for kapok. This study shows the interfacial shear strength is dependent on the elastic modulus and density of the fiber but the change in the interfacial contact surface area due to change in embedded length of fiber has no significant effect on the interfacial shear strength value. But the change in diameter of the fiber and void ratio affects interfacial shear strength. Rather the presence of void does have a positive effect on the incremental of the value interfacial shear strength.en-USFiber pulloutfiber-epoxy matrixABAQUSInterfacial Shear StrengthThesis