Teak bark fibers are natural fibers obtained from teak trees (Tectona Grandis), and can be degraded naturally and are cheaper than synthetic fibers. The purpose of this study was to determine the Power Characteristics of Teak Bark Composite Strength with Fiber Direction Variation. In this study a good fiber selection was conducted. then teak bark fiber is soaked in a 5% NaOH solution for 60 minutes and rinsed with clean water and then dried. Next cut with a length of 200mm x width 5mm for a tensile test, and for an impack test of 80 mm length x 5mm width. Furthermore, making composites using mixing using a ratio of 30% teak kullit fiber and polyester resin 70% of the entire weight of the specimen. From each test using 12 specimens consisting of teak bark fibers, both for tensile tests, and impack tests with variations in the direction of unidirectional fibers (straight fibers), pseudoisotropic (random fibers), bidirecitional (woven fibers). Based on the results of teak wood fiber composite testing that has been done and the conclusion is that the average tensile strength of this woven fiber has the highest tensile and strain values of other variations, 22.58 MPa and 3.86% strain. Composites with straight fiber direction have an average value of tensile stress of 20.57 MPa and a strain of 3.5%, composites with the lowest value are random fiber direction variations of 12.14 MPa and strain 1.75%. Whereas for the impack test the energy absorbed by the average impack was the largest reaching 0.56 Joules in the straight fiber direction. And the average impack value produced using straight fiber also gets the maximum value of impack strength that is 0.0061 (J / mm2).
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