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Tensile Strength and Density of Teki Grass (Cyperus Rotundus)Used as Materials for Fibre Composites with Fibre Angle Variation

Tensile Strength and Density of Teki Grass (Cyperus Rotundus)Used as Materials for Fibre Composites with Fibre Angle Variation

Muhammad Rafiq Yanhar, A. Haris Nasution

Department of Mechanical Engineering Faculty of Engineering Islamic University of North Sumatera (Indonesia)

Abstract

The primary purpose of this study is to determine the tensile strength and density)of the Indonesian term teki grass (Cyperus rotundus)in which this teki grass is used as the reinforcement materials for the production of fibre composite. The production process is carried out by using varieties of fiber directions ranging from 0°, 45°, 90°,and random.The methods in use is hand lay-up with 3 repetitions. Teki grass is chosen because it is easily found and has the following significances: biodegradable, harmless to health, available in nature in large quantities, and cost efficient. Another reason because this plant is also an agricultural weed that is difficult to eradicate, not fully utilized, and often found in open field. While a matrix for fiber binder selected from epoxy resin material. From the test results it can be concluded that the variations in the direction of fibers effect on the tensile strenght of the composite. Average tensile strength of specimens with fibre directions of 0°, 45°, 90°, and random are 15.60 MPa, 18,69MPa, 30.11 MPa, and 22.79 MPa. In contrast, variations of fibre directions do not affect the density.

Keywords: Tensile strength, density, composite, hand lay up, fiber direction

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