Electronic Theses and Dissertation

Permasalahan lingkungan akibat peningkatan limbah sampah plastik dan ampas kopi mendorong perlunya inovasi material berkelanjutan. Penelitian ini bertujuan untuk mengkaji sifat mekanik komposit berbasis polimer daur ulang PLA, PET, dan Nylon yang diberi penggisi ampas kopi sebagai kandidat filamen 3D printing. Proses pembuatan komposit dilakukan dengan metode manual dilakukan dengan dimasukan kedalam oven lalu ditekan secara manual menggunakan komposisi 70% polimer dan 30% ampas kopi. Spesimen uji dibuat sesuai standar dan diuji menggunakan uji tarik (ASTM D638) dan uji lentur (ASTM D790). Parameter mekanik yang dianalisis meliputi kekuatan tarik, regangan, tegangan, dan Modulus elastisitas, dan kekuatan bending kekuatan lentur, tegangan lentur dan Modulus lentur. Hasil penelitian ini menunjukkan bahwa komposit PET + ampas kopi memiliki kekuatan tarik dan bending tertinggi dibandingkan polimer lainnya.
Kata Kunci: Material Teknik, Material Komposit, dan Metalografi dan Karateristik Material.

Environmental issues resulting from the increase in plastic waste and coffee grounds have prompted the need for sustainable material innovation. This study aims to examine the mechanical properties of recycled polymer composites made from PLA, PET, and nylon filled with coffee grounds as candidates for 3D printing filament. The composite fabrication process was carried out manually by placing it in an oven and manually pressing it using a composition of 70% polymer and 30% coffee grounds. Test specimens were made according to standards and tested using tensile tests (ASTM D638) and flexural tests (ASTM D790). The mechanical parameters analyzed included tensile strength, strain, stress, and modulus of elasticity, as well as bending strength (flexural strength, flexural stress, and flexural modulus). The results of this study indicate that the PET + coffee grounds composite has the highest tensile and bending strength compared to other polymers. Keywords: Engineering Materials, Composite Materials, and Metallography and Material Characteristics.