Aluminium merupakan salah satu logam non-ferrous yang paling banyak dipergunakan dalam bidang keteknikan karena memiliki sifat yang ringan, tahan terhadap korosi, dan dapat didaur ulang. Daur ulang adalah proses untuk menjadikan suatu bahan bekas menjadikan suatu bahan bekas menjadi suatu yang berguna. Dalam penelitian ini dilakukan daur ulang dengan metode remelting aluminium piston bekas dengan harapan nantinya bahan piston bekas dapat dipergunakan kembali. Tujuan penelitian ini adalah untuk mengetahai nilai kelelahan fatik aluminium hasil remelting piston bekas pada variasi beban yang berbeda. Metode penelitian memvariasikan beban 40%, 50%, dan 60% dari Yield Strength untuk menghasilkan nilai kelelahan. Nilai uji fatik dari pembebanan 40% Yield Strength diberi beban 1,2 kg mendapatkan nilai siklus putaran 171.026 dan waktu patah 01:34:01 detik. Pada pembebanan 50% Yield Strength diberi beban 1,5 kg mendapatkan nilai siklus putaran 56.796 dengan waktu patah 00:37:52 detik. Pada pembebanan 60% Yield Strength diberi beban 1,8 kg mendapatkan nilai siklus putaran 24.384 dan waktu patah 00:16:15 detik. Semakin besar beban yang diberikan semakin kecil siklus dan waktu yang dihasilkan, sebaliknya semakin kecil beban yang diberikan semakin besar siklus dan waktu yang dihasilkan.Kata kunci : Aluminium scrap, Piston bekas, Remelting, Uji fatik, Rotary bending.
This research aimed to carry out the response of seed germination and seedling growth of Calina papaya to the seed soaked in coconut water. It was conducted from April to June 2017. The study comprised two designs of experiment i.e. the Completely Randomized Design for the seed germination and the Randomized Complete Block Design for the seedling growth of papaya. There were 25 treatment combinations obtained and each treatment was replicated three times. The treatment factors comprised the concentration and the duration of seed soaked in coconut water. The results showed that the seed immersion in the 80% concentration of coconut water for 8 hours had the highest growth rate and vigour index. Meanwhile, the seed immersion in the 60% concentration of coconut water for 8 hours showed the highest percentage of germination. The seed immersion for eight hours resulted in the seedling growth of papaya.
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