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INDONESIA
KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan
Published by Universitas Diponegoro
ISSN : 18298370     EISSN : 23019069     DOI : 10.14710/kapal.
Core Subject : Science,
Earth & Planetary Sciences
Jurnal ini merupakan Jurnal Ilmiah untuk mengembangkan ilmu dibidang Ilmu Pengetahuan & Teknologi Kelautan. Jurnal ini diterbitkan oleh Teknik Perkapalan Universitas Diponegoro 3 (tiga) kali dalam 1 tahun pada bulan Februari, Juni dan Oktober.
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Articles 7 Documents
 1 
Search results for , issue "Vol 5, No 2 (2008): Juni" : 7 Documents clear
ANALISA TEKNIS DAN EKONOMIS PENGGUNAAN COREMAT UNTUK KONSTRUKSI FRP (FIBERGLASS REINFORCED PLASTIC) SANDWICH PADA BADAN KAPAL Manik, Parlindungan; Hadi, Eko Sasmito
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 5, No 2 (2008): Juni
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (480.359 KB) | DOI: 10.14710/kpl.v5i2.3192

Abstract

Planning of ship construction is make its having good effectivity value and efficiency. Composite as material alternative to changes of steel feedstock and wood has many applied named FRP (fiberglass reinforced plastics) single skin. The weakness of this FRP was heavy construction and requires many production time. Therefore, will be checked comparison between single skin with sandwich constructions for shell. In this research, the way for making composite is hand lay up method with three various thickness of skin there are : t, t/2, and t/4. To know strength comparison from the various skin of sandwich with single skin, must be test, consist of tensile test.. The result is analyzed then compared by BKI (Biro Klasifikasi Indonesia) rules for the fiberglass ship. Based on the result, indicates that optimization skin thickness of sandwich construction applies Coremat which tensile strength it is equivalent with Single Skin at 2/3t and usage of Sandwich construction causes 23,12 % lighter. In economic analyze, advantage from low weight is compensation of addition 23,12 % DWT. Material cost for Sandwich about 11,35% bigger than Single Skin construction.
ANALISA TEKNIS KEKUATAN MEKANIS MATERIAL KOMPOSIT BERPENGUAT SERAT AMPAS TEBU (BAGGASE) DITINJAU DARI KEKUATAN TARIK DAN IMPAK Yudo, Hartono; Jatmiko, Sukanto
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 5, No 2 (2008): Juni
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (311.106 KB) | DOI: 10.14710/kpl.v5i2.3197

Abstract

Serat ampas tebu (baggase) merupakan limbah organik yang banyak dihasilkan di pabrik-pabrik pengolahan gula tebu di Indonesia. Serat ini memiliki nilai ekonomis yang cukup tinggi selain merupakan hasil limbah pabrik gula tebu, serat ini juga mudah didapat, murah, tidak membahayakan kesehatan, dapat terdegredasi secara alami (biodegradability) sehingga nantinya dengan pemanfaatan sebagai serat penguat komposit mampu mengatasi permasalahan lingkungan. Dari pertimbangan diatas maka penelitian ini dilakukan untuk mendapatkan analisa teknis berupa kekuatan tarik dan impak dari komposit berpenguat serat ampas tebu (baggase) dengan perlakuan pola anyaman variasi arah serat sudut arah serat sudut searah 00 dan bersilangan 450. sebagai penguat matrik resin polyester. Dari hasil pengujian spesimen dilakukan analisa kekuatan mekanis kemudian dibandingkan dengan nilai kekuatan mekanis yang disyaratkan/diizinkan oleh Biro Klasifikasi Indonesia (BKI) sebagai tolak ukur standar ujinya. Pengujian komposit berpenguat serat ampas tebu membandingkan arah serat sudut 00 dan 450, perlakuan serat pola anyaman, fraksi volume 44% matrik polyester dan 56% serat ampas tebu, dengan metode hand lay up, hasil pengujian didapat harga kekuatan tarik tertinggi dimiliki oleh komposit dengan arah serat sudut searah 00. Hasil pengujian menunjukkan bahwa kekuatan tarik dan modulus elastisitas dari komposit berpenguat serat ampas tebu belum dapat memenuhi standar kekuatan tarik dan modulus elastisitas yang disyaratkan BKI yakni : untuk arah serat sudut searah 00 kekuatan tariknya sebesar 1.69 kg/mm2 dan modulus elastisitasnya sebesar 115.85 kg/mm2, untuk arah serat sudut bersilangan 450 kekuatan tariknya sebesar 1.34 kg/mm2 dan modulus elastisitasnya sebesar 108.40 kg/mm2.
ANALISIS KEKUATAN SAMBUNGAN LAS SMAW ( SHIELDED METAL ARC WELDING ) PADA MARINE PLATE ST 42 AKIBAT FAKTOR CACAT POROSITAS DAN INCOMPLETE PENETRATION Mulyatno, Imam Pujo; Jokosisworo, Sarjito
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 5, No 2 (2008): Juni
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (715.816 KB) | DOI: 10.14710/kpl.v5i2.3193

Abstract

At this moment, weld engineering is applied widely in tacking on joints at construction of steel building, especially at ship building. All important in weld engineering is when process tacking on weld metal with steel metal to be one unities. It mean, the strength of metal result by welded must equal to the original metal. Generally, that thing is inaccessible cause by weld defect formed. Result of survey in JMI indicates that often happened problem at weld joint part of construction of hull causing existence of fraction or crack at the division. Because, hull is main part which received many forces, in water compressive force ( hydrostatic ) and ship attractive force on top of wave ( sagging ) and or in trough of wave ( hogging ). Even, at the moment of ship in full cargo condition or when at dock, ship must can maintain the selfish strength. In the research, will be checked weld defect influence incomplete penetration and porosity formed at SMAW method, evaluated from tensile and compressive strength as the application of force received by ship.from the result, indicates that tensile strength is optimum happened at the normal joint plate without heat treatment about 464, 50 Mpa, while tensile strength is lowest at joint plate condition of heat treatment 6000 C about 351,23 Mpa. for optimal of compressive strength happened at normal joint of plate without heat treatment about 872, 17 N/mm2, while compressive strength is lowest at joint plate condition of heat treatment 3000 C about 684 N/mm2. In this experiment, weld defect of incomplete penetration and porosity is not too effect a weld joint strength caused all to fracture happen in base metal is not it in weld joint or weld metal, however for all weld defect must be minimizes
STUDI KOMPARASI KINERJA HULLFORM METODE FORMDATA DENGAN HULLFORM KAPAL KAYU TRADISIONAL TIPE BATANG Zakki, Ahmad Fauzan; Manik, Parlindungan
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 5, No 2 (2008): Juni
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (332.803 KB) | DOI: 10.14710/kpl.v5i2.3194

Abstract

At the moment most fisherman in Indonesia still use traditional fishing boat. this immeasurable Traditional ship its for. This matter earn us see almost in every coastal area region of Indonesia have form of desain different ship. Traditional Ship Desain represent result of study of nature, so that there no planning and calculation of standard desain before that ship is woke up but got skill by generations from all its predecessor. Because technical calculation of shipbuilding moment less is paid attention, hence in this research of comparison of performance of hull form among traditional ship of method of formdata. Available expecting of information so that can become an more beneficial alternative for the development of fishing boat hull form in territorial water of Batang. Marginally this research indicate that method ship hull form of formdata yield lower total resistance with difference 13,7%. At stability evaluation of hull method ship form of formdata have righting lever of larger ones. At excess navigation evaluation owned by except to traditional ship of movement of rolling
ANALISIS PENGARUH PERLAKUAN PANAS TERHADAP PELAT KLASIFIKASI BKI TEBAL 10 mm PADA SAMBUNGAN LAS Mulyatno, Imam Pujo; Yudo, Hartono
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 5, No 2 (2008): Juni
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (421.605 KB) | DOI: 10.14710/kpl.v5i2.3190

Abstract

Heating treatment at the fabrication make the tensile strength, bending strength, and hardness strength are become lower. The research vision are to prover that heating at the plate without heating treatment, heating treatment 300 0C, heating treatment 600 0C. Welding at research use SMAW (Shield Metal Arc Welding) welding method. The mean of tensile test without heating treatment (419 Kg/mm2), heating treatment 3000C (424 Kg/mm2), heating treatment 6000C (415 Kg/mm2). The mean of bending test without heating treatment (845 N/mm2), heating treatment 3000C (768 N/mm2), heating treatment 6000C (724 N/mm2). The mean of hardness test whitout heating treatment (129 HVN), heating treatment 3000C (147 HVN), heating treatment 6000C (160 HVN). From the test we get conslusion that the best result is Marine use plate ST 42 with BKI classification with heating treatment 300 0C, heating process is 60 minutes in the oven. After that cooling treatment to be done until back normal degree
ANALISA KEANDALAN SISTEM BAHAN BAKAR MOTOR INDUK PADA KM. LEUSER Hadi, Eko Sasmito; Budiarto, Untung
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 5, No 2 (2008): Juni
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (669.868 KB) | DOI: 10.14710/kpl.v5i2.3195

Abstract

Fuel oil system is one of the vital main engine supporting systems of MV. Leuser because this system is directly influence the main engine performance. The failure of fuel system should be the main engine shut down. The bigger affect was the ship could not be operated so the financial lost would be occurred. The aim of the research is an analysis the fuel system by approximation on reliability based. An analysis of the system was using qualitative and quantitative approximation. Qualitative analysis could be achieved by the Failure Mode and Effect Analysis (FMEA) and the Fault Tree Analysis (FTA). The quantitative analysis could be achieved by the Monte Carlo simulation. The resulted of the research, severity components such as filter, separator, transfer pump and booster pump was obtained by the severity classification and failure probability. The simulation would be achieved the value availability at 0.97 and the value of MTTFF (Mean Time to First Failure) is 2423.8363 hours. The simulation used some scenarios, the system availability would be more decrease if there were more stand by components occur the failure in the one of the components at 0,893.
ANALISA PERHITUNGAN FAKTOR INTENSITAS TEGANGAN (SIF) DENGAN VARIASI PANJANG RETAK PADA PELAT GELADAK KAPAL “ MT. KLAWOTONG “ MENGGUNAKAN METODE ELEMEN HINGGA (FEM) Zakki, Ahmad Fauzan; Kiryanto, Kiryanto
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 5, No 2 (2008): Juni
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (685.399 KB) | DOI: 10.14710/kpl.v5i2.3196

Abstract

Adanya cacat retak pada pelat geladak utama merupakan salah satu penyebabkegagalan suatu struktur kapal. Retak terkadang banyak tidak dihiraukan, apalagi bilaretak tersebut kecil dan kurang terlihat oleh mata secara visual. Tanpa kita sadari lambatlaun retak tersebut akan melebar karena pengaruh pembebanan dimana pelat memikulgaya-gaya lateral dan momen lentur. Dengan mempelajari karakteristik retak tersebutdapat diketahui besarnya faktor intensitas tegangan (SIF) pada pelat geladak utama kapalmenggunakan matematis yang disimulasikan dengan model. Model ini didasarkan atasmekanika fraktur (FM) dan metode elemen hingga (FEM). Dengan demikian, perilakupelat geladak utama kapal yang mengalami retak dengan gaya pembebanan dapatdipelajari dengan rinci, sejak saat pelat geladak tersebut mulai dibebani sampaimengalami crack propagation yang masih stabil.Dalam penelitian ini penulis melakukan pencarian data dan wawancara langsungdengan layek yang menangani pembangunan kapal MT. Klawotong, kemudian menentukandaerah yang dikaji adalah pelat geladak utama daerah cargo oil 3. Pengolahan datadimulai dengan menghitung konstruksi profil, kekuatan memanjang, pemodelanmenggunakan program ANSYS Ver. 9.0. dan dilanjutkan dengan perhitungan nilai faktorintensitas tegangan (SIF).Penelitian tentang kegagalan struktur ini menghasilkan beberapa hal antara lain:kondisi Sagging tegangan pelat 50,34 Mpa dengan faktor keamanan 8,939, panjang retakmaksimal yang dikaji 0,02 m, nilai faktor intensitas tegangan (SIF) KI WD. Pilkey = 12,615Mpa m , KII WD. Pilkey = 0 Mpa m , KI ANSYS = 13,451 Mpa m , KII ANSYS = 0,693 Mpa m ,sehingga diperoleh prosentase kesalahan perhitungan program KI = 0,062 %, KII = 1%dan kondisi Hagging tegangan pelat 15,08 Mpa dengan panjang dengan faktor keamanan29,841, panjang retak maksimal yang dikaji 0,3 m, nilai faktor intensitas tegangan (SIF) KIWD. Pilkey= 14,645 Mpa m , KII WD. Pilkey = 0 Mpa m , KI ANSYS = 15,585 Mpa m , KII ANSYS= 0,352 Mpa m , sehingga diperoleh prosentase kesalahan perhitungan program KI =0,062 %, KII = 1%.

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