Modeling the Interfacial Shear Strength of Natural Fibers Epoxy Matrix by Pullout Failure Mode
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Date
2022
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Addis Ababa University
Abstract
Recently 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.
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Keywords
Fiber pullout, fiber-epoxy matrix, ABAQUS, Interfacial Shear Strength