Mass Variation Effect of Teki Grass (Cyperus rotundus) Composite Against Tensile Strength and Density
Muhammad Rafiq Yanhar, A. Haris Nasution
Department of Mechanical Engineering Islamic University of North Sumatera (Indonesia)
The primary purpose of this study is to determine the tensile strength using ASTM D638 – 02a type IVB and density of teki grass (Cyperus rotundus) composite. The production process is carried out by mass variation of 2 gr, 3 gr, and 4 gr. Hand lay-up method with 3 repetitions are applied. Teki grass is chosen because it is easy to find and has some advantages biodegradable, harmless to health, available in nature in large quantities, and cost-efficient. Test result showed the largest tensile strength is 21,61 MPa at 2 gram mass fiber. Fiber addition to 3 gram and 4 gram cause tensile strength decreases to 18,51 MPa and 11,65 MPa. It happens because the fibers are random and spreads in all directions, so many fibers are undirectional wit h tensile force. Beside that fibers addit ion made matrix volume reduced and bond between fiber and matrix decreases, finally make fiber unable to hold the tensile force properly. It is recommended to use another type of ASTM D638 – 02a which has a larger narrow section like type I (13 mm) and type III (19mm) so specimens are not broken when removed from the mold, and there isn’t any decrease in tensile strenght.Density test showed that fiber mass does not significantly affect the density.
Keywords: Tensile strength, density, hand lay up, fiber mass
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