STUDI KARAKTERISTIK KOMPOSIT KULIT KRAS DAN RAMI DENGAN MATRIK RESIN EPOKSI SEBAGAI BAHAN TAHAN IMPAK

Aris Budianto, Heru Santoso BR

Abstract


The use of natural fibers as reinforcement in polymer composite materials provide several advantages because of natural fibers have low density, capable of biodegradable, recyclable, cheap price and has good mechanical properties and can be renewed because it comes from nature. Composite material is a material system that incorporated a combination of two or more constituent materials that on a macro scale is different in shape or material composition of each insoluble each other. Crust leather is skin rawhide tanning process results from large and small animals. The use of leather has been used only in the fulfillment of human needs in terms of clothing such as jackets, shoes, bags and others. Hemp (Boehmeria Nivea) belong to the natural plant fiber derived from the bark (bast). Crust leather and hemp used in this study by using epoxy resin matrix to form a composite.

Composites in this study were made with a constant pressure of 100 kg / cm2. Samples were prepared with 56% volume fraction with KR11 arrangement, KR22 and KR33, and 61% with RK11 arrangement, RK22 and RK33, and different thicknesses respectively 0.5 cm, 1.3 cm and 2.0 cm . Tests performed by ballistic test and the results are measured using chronograph to know bullet speed reduction after passing through the sample. The type of weapon used Sigak short barrel Glock 17 with a bullet throw velocity 1236 fps, with a range of 5 meters. The ballistic testing using NIJ standard level III.

The results showed that the longer the thicker the sample the higher the speed reduction bullets, and bullet velocity difference in the rate of decline occurred in most major KR33 arrangement with a decrease of 87.18% the speed of a bullet. The result of a decrease in the speed of a bullet to the sample KR11, KR22, KR33, RK11, RK22 and RK33 are 13,27%, 28,43%, 87,18%, 12,93%, 65,40%, 41,75%.

 

Keywords : composite, crust leather, hemp, ballistic test.

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