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Nevada M.J. Nanulaitta
Politeknik Negeri Ambon
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Journal : ARIKA

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Analisa Lanjut Hasil Uji Kekuatan Tarik Besi Beton Untuk Struktur Beton Jembatan Waihattu Melalui Perbandingan Perhitungan Manual Dengan Program Minitab Versi 13 Steanly R.R. Pattiselanno; Nanse H. Pattiasina; Nevada M.J. Nanulaitta
ARIKA Vol 7 No 2 (2013)
Publisher : Industrial Engineering Study Program, Pattimura University

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Abstract

Tujuan penelitian adalah menganalisa lanjut hasil uji kekuatan tarik besi beton untuk tulangan beton jembatan melalui perbandingan hasil perhitungan manual dengan perhitungan program miniteb versi 13 untuk tingkat kepercayaan 95% dan 99%. Perbandingan hasil yang dilakukan melalui pendekatan tahapan perhitungan manual adalah menghitung mean sampel, deviasi standar sampel dan estimasi internal mean populasi, serta tahapan tahapan minitab versi 13 adalah uji normalitas dan perhitungan cepat tingkat kepercayaan 95% dan 99%. Penilaian dilakukan dengan menggunakan prosedur jumlah sampel kecil (n<30). Untuk sampel berdiameter ( ) 10 mm, 16 mm, 19 mm dan 22 mm. Berdasarkan teknik analisa dan metode estimasi titik dan metode estimasi internal, sebagai besaran perbedaan untuk interval kepercayaan Ci = 95%, berkisar antara 0,001% s/d 0,239%, besaran perbedaan untuk interval kepercayaan ci = 99% berkisar antara 0,002% s/d 0550% dan pebedaan besaran tegangan tarik antara daerah interval kepercayaan ci=95% berkisar antara 0.001% s/d 0.315%.
Analisa Keragaman Nilai Kekerasan Baja St-42 Melalui Proses Karburasi Menggunakan Komposisi BaCO3 Dan Carbon Dengan Variasi Waktu Penahanan Nanse H. Pattiasina; Nevada J.M. Nanulaitta; Steanly R.R. Pattiselanno
ARIKA Vol 5 No 2 (2011)
Publisher : Industrial Engineering Study Program, Pattimura University

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Abstract

Pack carburizing is a method of thermo chemical treatment, when carbon dissolved in steel surfaces, revolve 0.3% - 0.9% with temperature between 825 oC - 925 oC, and keep it at several time and then continued with quenching process using water, oil, air or salt. This research had arranged to test the hardness of low carbon steel (ST-42) with 40% of BaCO3, and 60% of Carbon, before and after carburizing process in 3 type of holding time: 15, 30, and 50 minutes. Based on results, the best combination to reach a higher value of hardness provides by combination of after carburizing process and 50 minutes of holding time. Later, an extensive experiment by 2 hours of burning had shown an increase level of hardness up to 365% from the initial condition which proves the quality of this best treatment combination.
Analisis Perbandingan Komposisi Karbon Dan Bubuk Tulang Sapi Dalam Proses Karburasi Padat Untuk Mendapatkan Nilai Kekerasan Tertinggi Pada Baja Karbon S-35 C Nevada J.M. Nanulaitta; Eka R. M. A. P. Lilipaly
ARIKA Vol 5 No 2 (2011)
Publisher : Industrial Engineering Study Program, Pattimura University

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Abstract

S-35 C, is a low steel carbon type with 0,30% - 0,35% carbon composition, which has a low hardness. This matter can be overcome by changing the hardness of this steel through heat treatment process. Heat treatment method used in this experiment is pack carburizing method. Experiment results showed that with composition of 500 g of carbon and 0% beef bones with 15 minutes holding time, the hardness number increased as much as 116.90 HRC, there was 20.54 HRC number increased. With 10% of cow bones composition, hardness number became 118.39 HRC and 20.40 HRC number increased. HRC number became 122.20 and increased by 24.38 on 20% composition, and on 30% the hardness value became 130.36 HRC, increased until 32.05 HRC number. 40% composition showed increasing hardness number up to 133.34 HRC, with 35.08 HRC increased. And 50% composition showed 141.29 HRC number, increased until 43.95 HRC. 50% composition produce the highest increase of hardness number, this verified that the higher composition of cow bones makes higher increasing of hardness number in a heat treatment process deliver a harder steel, and also prove that beef bones can be used as a catalyst in pack carburizing process.
Co-Authors Agustinus O. Lopuhaa Annafiyah Annafiyah Basri Katjo Clara Sekeroney Cley Talkua Demmatacco, F Erwin Bravor Pattikayhatu F. Demmatacco Faizatur Rohmah Frederick Dematacco Fredrik Demataco Graciadiana. I. Huka Helen Riupassa Hendry Y. Nanlohy Herman Tjolleng Taba Hermon Latumaerissa Hermon. Latumaerissa Huka, Graciadiana I Ike Dayi Febriana Imam A Hanifah Josef Matheus Julian Salakory Kelian, Nur Aisyah Utami Laily Ulfiyah Lasamahu, Stevanno B D Latuconsina, Muhammad Jen Leatemia, Josua M. Leatemia, Meiti Lekatompessy, R.R. Lekatompessy, Roy R. Leslie S Loppies Lilipaly, Eka Rahmat Mahayani Anthonio Putera Lukman Hadiwijaya Malakauseya, J. J Marthina Mini Masaki Yamaguchi Matheus, J Mohammad Anas Fikri Nanse H. Pattiasina Patikayhattu, Erwin Patty, Alexander A. Pelasula, Berthy Picanussa, Jovancko. S. S. Ramadhan, Fahri Ratna Ayu Dewi Ratna Ayu Pawestri Kusuma Dewi Rey Joy Toding Padang Roy R Lekatompessy Rudy Soenoko Soeprapto, Wahyono Steanly R.R. Pattiselanno Steanly R.R. Pattiselanno