Browsing by Author "Alemseged, Moreda"

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    Fracture Behavior of Bidirectional Woven Glass Fiber Reinforced Epoxy Composite Material with Different Fiber Orientation
    (Addis Ababa University, 2019-07) Alemseged, Moreda; Daniel, Tilahun (PhD); Mulugeta, H. (Mr.)
    Glass fiber is by far the most predominant fiber used in the reinforced polymer industry and among the most versatile. E Glass fiber reinforced polymer matrix composites have been widely used as a substitute materials in automobile and aerospace applications, because of their lightweight characteristics and better mechanical properties. Although glass fibers used for different applications, they have the problem of crack formation and propagation at a working load. Even if many studies have been made on woven (bidirectional) glass fiber reinforced epoxy composite materials, we cannot stop or minimize the crack propagation yet. Therefore, there is a need to conduct research in order to investigate the fracture behavior of this composite material. Fracture behavior of woven glass fiber epoxy composite material, will be studied using the experimental method. The fracture toughness; associated with fiber tensile failure in a woven glass fiber reinforced epoxy composite material is measured using a compact tension test. Investigation deals with the characterization of tensile properties according to the ASTM standard D E399. Hand layup technique was employed to prepare the compact tensile specimen. The values of the tensile fiber failure critical energy release rate were determined for all orientations (0 0 0 0 , 30 , 45 0 , and 60 ). The energy release rates of all the samples are 198.66 kJm -2 for CTS 0, 229.22 kJm -2 for CTS 30, 268.64 -2 KJm for CTS 45 and 232.98 KJm -2 for CTS 60. The woven glass fiber reinforced epoxy composite material with 0 orientation has an overall improvement of 22.62% strain energy release rate over that of CTS 30, CTS 45 and CTS 60.