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Jurnal Ilmiah Teknik Mesin
Published by Universitas Lampung
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Mechanical Engineering
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Articles 11 Documents
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Search results for , issue "Vol 1, No 4 (2013)" : 11 Documents clear
PENGARUH UKURAN BUTIR SERBUK FLY ASH TERHADAP KEKUATAN IMPACT BAHAN KOMPOSIT BERMATRIKS EPOXY Agus Setiawan; Shirley Savetlana; Gusri Akhyar Ibrahim
Jurnal Ilmiah Teknik Mesin Vol 1, No 4 (2013)
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Mixing types of epoxy polymers with fly ash (fly ash) coal into composite materials is expected to be one of the ways to look for an alternative to metal materials. Mixing two different materials is intended to improve the mechanical properties of composites by utilizing waste coal as a reinforcing material. Making specimens was based on differences in particle size of the fly ash powder. Fly ash sifted with a sieve to obtain a variation of the size of the fly ash particles with a size of 40 mesh, 80 mesh and 120 mesh. While the epoxy resin used was a general purpose type (Bisphenol Aepichlorohydrin) Bakelite EPR 174 with a ratio between the epoxy resin and hardener 1:1. After getting the fly ash according to the desired size, made by mixing epoxy resin through the calculation of the mass fraction. The process of mixing epoxy resin with coal fly ash waste is done with matrix mixing ratio by 60% and 40% fly ash. Then do the impact test for pure epoxy resin and for composites. Fracture area photo by scanning electron microscope (SEM) was used to analyze the causes of failure in composites. Testing was conducted ann accordance with the standard impact test ASTM D 6110. The test results showed the addition of fly ash particles with increasing particle size of 40 mesh, 80 mesh and 120 mesh can improve the impact strength of the composite. Highest impact strength of the composite obtained at 120 mesh particle size of 3.967 x 10-3 J/mm2. With the decrease in the size of particles, extensive contact between the surface of fly ash with resin will be many more. So, to the improve impact strength. In the SEM image results look excellent interface bonding between the matrix with fly ash particles. In the composite looks much voids or porosity.Keywords: epoxy, composites, fly ash, impact test, SEM photos, the mechanical properties.
ANALISIS THERMAL DAN TEGANGAN PADA PERANCANGAN BEJANA TEKAN (PRESSURE VESSEL) UNTUK LIMBAH KELAPA SAWIT DENGAN KAPASITAS 10.000 TON/BULAN Rahmat Ramadhan; A.Yudi Eka Risano; Ahmad Su'udi
Jurnal Ilmiah Teknik Mesin Vol 1, No 4 (2013)
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Bejana tekan (pressure vessel) adalah tempat penampungan suatu fluida baik berupa cair maupun gas dengan tekanan yang lebih tinggi dari tekanan atmosfir. Aplikasi bejana tekan salah satunya pada tahapan perebusan di pengolahan limbah kelapa sawit untuk memproduksi biodiesel. Pada proses perebusan terjadi pembebanan struktural berupa tekanan dan beban thermal yang tidak merata pada bejana tekan sehingga terjadi pembebanan yang terintegrasi. Bagaimana pun pembebanan yang terintegrasi akan mengakibatkan efek yang berbeda dibanding hanya satu pembebanan saja sehingga penting untuk menganalisis desain dengan mengaplikasikan pembebanan yang terintegrasi. Tujuan penelitian ini adalah untuk menganalisis tegangan maksimum yang diijinkan dan efek beban thermal yang terjadi pada desain bejana tekan. Analisis dilakukan dengan mensimulasikan model dengan pembebanan thermal internal berupa konduksi sebesar 80°C pada sisi shell bagian dalam dan konveksi udara bebas di sisi shell bagian luar dan pembebanan thermal eksternal berupa konduksi sebesar 80°C pada sisi shell bagian dalam dan konveksi udara bebas serta konveksi sebesar 200°C dengan koefisien perpindahan panas sebesar 7,3236 W/m K di sisi shell bagian luar. Kemudian keduanya ditambahkan pembebanan struktural berupa tekanan sebesar 294 kPa dan percepatan gravitasi bumi. Hasil dari penelitian menunjukkan bahwa tegangan maksimum pada geometri model yang terjadi untuk beban thermal internal yaitu sebesar 160,91 MPa dan beban thermal eksternal sebesar 160,56 MPa terletak pada pipa nozzle. Penambahan beban thermal mengakibatkan peningkatan tegangan sebesar 17,87% dibandingkan dengan simulasi beban struktural saja (136,51 MPa). Keywords:Bejana Tekan, Metode Elemen Hingga, Analisis Thermal dan Tegangan
Cover Jurnal FEMA Vol.1 No.4 Oktober Tahun 2013 Cover Halaman Sampul
Jurnal Ilmiah Teknik Mesin Vol 1, No 4 (2013)
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Ini adalah sampul jurnal FEMA Vol.1 No.4 Tahun 2013
UNJUK KERJA VORTEX TUBE COOLER PADA PEMESINAN BAJA ST41 Akhmad Isnain Pulungan; Gusri Akhyar Ibrahim; Yanuar Burhanuddin
Jurnal Ilmiah Teknik Mesin Vol 1, No 4 (2013)
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Proses pemesinan merupakan proses manufaktur dimana objek dibentuk dengan cara membuang atau menghilangkan sebagian material dari benda kerjanya. Pada proses pembubutan, panas yang dihasilkan sangat tinggi sebagai akibat dari gesekan antara pahat bubut dan benda kerja. Salah satu faktor berpengaruh pada dalam proses pembubutan adalah media pendingin. Dalam penelitian ini pembubutan dilakukan menggunakan pahat HSS dan material uji baja ST41, dengan media pendingin system vortex tube (udara dingin bertekanan) menghasilkan suhu udara dingin 14,6 C, 18,5 C, 21, C. Udara dingin luaran vortex tube digunakan selama proses pembubutan dengan parameter feeding (f) 0,1 mm/rev, kecepatan spindel adalah 625(rpm) dan kedalaman potong konstan 2 mm. Hasil penelitian pendingin vortex tube bukaan 2 dengan gerak makan 0,11 mm/rev dan kecepatan potong 80,46 m/menit menghasilkan umur pahat mencapai 5,63 menit, pada bukaan 3 dengan kecepatan potong 72,61 m/menit dan gerak makan 0,11 mm/rev umur pahat mencapai 5,60 menit. Umur pahat terendah di dapat tanpa menggunakan pendingin dengan gerak makan 0,11 mm/rev, kecepatan potong 88,39 m/menit, yaitu mencapai 2,86 menit dan umur pahat tertinggi didapat menggunakan media pendingin vortex tube bukaan 1 dengan gerak potong 0,11 m/rev dan kecepatan potong 88,39m/min sebesar 6,29 menit. Oleh karena itu media pendingin vortex tube dapat meningkatkan umur pahat HSS hingga mencapai 52,76%.Kata Kunci: Pembubutan, baja ST41, HSS, vortex tube, kecepatan potong, gerak makan, umur pahat
PENGARUH PENAMBAHAN LIMBAH PADAT ABU TERBANG BATUBARA(FLY ASH) TERHADAP KEKUATAN TEKAN DAN POROSITAS GENTENG TANAH LIAT KABUPATEN PRINGSEWU Puji Febriyansyah; . Tarkono; . Zulhanif
Jurnal Ilmiah Teknik Mesin Vol 1, No 4 (2013)
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Fly ash, chemicallyis analumino-silicamineral containing Ca, K, and Na elements, fly ash has amoderate to high bonding capacity characteristic , and has acement-forming properties. In this study the authors use the industrial fly ash coal waste as an alternative mixture of tile manufacture. The tiles manufactured by mixing clay, sand, water and fly ash. Then smoothed with ekstuder machine and forming kuweh then aerate for 3 days, before do the dieing process . Tile dried for 4 days, then do fumigation for 12 hours and followed by burning process for 12 hours . Testing is done for press and porosity testing in order to determine the presence/absence of the influence of the addition of rice husk ash/fly ash to clay tile in the Pringsewu Region.The results showed that there is compressive strength and porosity change compared to tiles without a mixture of fly ash . The optimum value for testing tap and porosity testing obtained on the tile with a mixture composition of fly ash is 5% to the value of the average compressive strength of 11,042 kPa and the mean porosity is17.27 % . The minimum value for testing tap and porosity obtained on tile without fly ash mixed with the mean compressive strength of 8,393 kPa and the mean porosity is 21,92 %Keywords : clay tile, coal fly ash, silica (SiO2), compressive strength, porosity
PERANCANGAN BEJANA TEKAN (PRESSURE VESSEL) UNTUK PENGOLAHAN LIMBAH KELAPA SAWIT DENGAN VARIABEL KAPASITAS PRODUKSI 10.000 TON/BULAN Meylia Rodiawati; A.Yudi Eka Risano; Ahmad Su'udi
Jurnal Ilmiah Teknik Mesin Vol 1, No 4 (2013)
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Kelapa sawit adalah tumbuhan industri penghasil minyak yang dapat dikonsumsi maupun minyak industri. Bagaimanapun pengolahan kelapa sawit akan menghasilkan limbah. Lebih lanjut, diketahui bahwa limbah tersebut berpotensi sebagai sumber biomassa untuk dikonversikan menjadi biodiesel yang salah satu tahapannya ialah perebusan. Kemudian, proses perebusan yang umum diaplikasikan ialah menggunakan bejana tekan sederhana yang kekuatan dan kapasitasnya terbatas sehingga berimplikasi pada hasil produksi yang tidak maksimal. Oleh sebab itu, penting  untuk merancang bejana tekan untuk pengolahan limbah kelapa sawit sesuai spesifikasi yang diperlukan. Tujuan dari penelitian ini adalah menghitung dan menentukan dimensi bejana tekan untuk menampung 10.000 Ton limbah kelapa sawit / bulan dan mengetahui tegangan yang terjadi pada bejana tekan pada saat pengolahan limbah kelapa sawit. Perancangan dilakukan dengan menentukan jenis bejana tekan yang akan dipakai kemudian melakukan perhitungan dan penentuan diameter bejana, jenis material, jenis shell, nozlle, lifting lug dan head, ketebalan tiap komponen, stress maksimum yang terjadi tiap komponen dan menggambar desain menggunakan software CAD. Hasil dari penelitian menunjukkan bahwa dimensi yang sesuai dengan spesifikasi yang diperlukan adalah bejana tekan berdiameter 3,82 m dan panjangnya 30 m. Kemudian tebal shell 3/8" (0,009525m), head tipe torispherical dengan tebal 0,5" (0,0127m), pipa nozzle 16" schedule 20 dengan ketebalan dinding pipa 7,9248mm, pipa manhole NPS 24 SCH 20 dengan ketebalan dinding pipa  manhole 9,525mm. Setelah dilakukan perhitungan tegangan longitudinal diperoleh nilai sebesar 29,4 MPa, tegangan circumferential  58,9 MPa dan tegangan total yang terjadi akibat termal Tegangan ini jika dibandingkan dengan tegangan ijinnya sebesar 174,8 MPa maka tegangan yang terjadi masih dalam kondisi aman. Kata kunci: Limbah kelapa sawit, Bejana Tekan (pressure vessel), ASME Section VIII Div.1, Shell,Head, Nozzle, Manhole.
PENGARUH PENAMBAHAN ABU SEKAM PADI DAN ABU TERBANG BATUBARA TERHADAP KEKUATAN TEKAN DAN POROSITAS GENTENG TANAH LIAT KABUPATEN PRINGSEWU Doni Sigit Kuncoro; . Tarkono; . Zulhanif
Jurnal Ilmiah Teknik Mesin Vol 1, No 4 (2013)
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Rice husk ash and prosperous coal fly ash silica (SiO2). Silica-term construction, concrete technology  has been used primarily as an additive. Husk ash and coal fly ash is used as an additive clay roof tile manufacturing process. It is made by compounding of clay, sand, water and husk ash. Then, they are mashed by extruder machine and forming of kuweh and then, airing for three days before the process of stamping. The roof tile is dried for four days then there is fumigation for twelve days and continued by combustion for also twelve days. The examination which used is press and porosity examination with the aim of knowing whether there is additional impact of rice’ husk ash’ existence or not into clay roof tile in Kabupaten Pringsewu. The research’s results showed that there is conversion of press and porosity power compared with roof tile rice’s husk ash composition. The optimum value for the press and examination of porosity obtained from the tile with a composition of 5% rice husk ash and 5% coal fly ash 'with an average of 12.253 KPa press strength and porosity values average value of 18.06%. The minimum value for the press obtained from the tile with a composition of 5% rice husk ash and 2,5% coal fly ash with the press power’s average value 9.757 KPa. The minimum value for porosity from the tile with a composition of 5% rice husk ash and 7,5% coal fly ash with the porosity average value 23.78%. Keywords: clay roof tile, rice husk ash, fly ash, silica (SiO2), press power, porosity.
KAJI EKSPERIMENTAL SISTEM PENYIMPANAN BIOGAS DENGAN METODEPENGKOMPRESIAN DAN PENDINGINAN PADA TABUNG GAS SEBAGAI BAHAN BAKAR PENGGANTI GAS LPG Dian Fadli; Muhammad Irsyad; M.Dyan Susila
Jurnal Ilmiah Teknik Mesin Vol 1, No 4 (2013)
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The potential of biogas from cattle dung in Lampung province is big enough that 227 792 kg / day based on the number of cattle and buffalo tails as much as 742.8. During this shelter biogas only placed in plain tubes which are then piped into the pipeline for use as lighting and gas stove. This study intends to outline the principles of storage technology in LPG cylinder biogas, biogas and testing by cooling and compressing. Based on the results of testing at constant pressure 6 bar with the lowest temperature variation 7 ° C the amount of mass is 36.4 grams stored while based on calculations using the ideal gas law mass quantities stored at a temperature of 7 ° C is 36.7 grams. And the highest temperature of 10 ° C the amount of stored mass of 34 grams, while based on the calculation of the amount of mass stored at a temperature of 10 ° C for 36 grams. This is an effective way to increase the density of the biogas. And a beginning reference for researchers who want to conduct research on biogas biogas ÙÎ÷Sõanging to a liquid phase. Keywords: Biogas, storage systems, compressing and cooling, Ideal Gas
Pengaruh Variasi Ukuran Partikel Marmer Statuari Terhadap Sifat Mekanik Komposit Partikel Marmer Statuari I Gede Mahayatra; Harnowo Supriadi; Shirley Savetlana
Jurnal Ilmiah Teknik Mesin Vol 1, No 4 (2013)
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Abstract Manufacture a composite material with a matrix resin epoxy  and marble statuary powder as filler is one industry-utilization of waste. Mechanical properties of the composite material is influenced by the particle size of the particles. variations in particle size would form different mechanical properties. This research was conducted to investigate the effect variations in particle size on the mechanical properties of the composite particles. In this research variation in particle size marble  statuary  used is 60 mesh, 100 mesh, 140 mesh and 200 mesh. Resin used is epoxy resin, and composition of the volume ratio between the matrix and the particles used in research was 80%: 20%. The method is used in the manufacture of composite hand lay-up method. Tests performed in this research is XRD testing on solid marble, bending strength, hardness, and SEM. XRD results obtained from the testing phase identified in the marble statuary are Ca2O5Si , CaCO3, CaO, SiO2 , MgO , MgCO3 , and SiC. Hardness value of composite particles of marble is 22.3 to 48.33 HB, and flexural strength values of composite particles of marble statuary  is from 13.89 to 38.89 N/mm . Particle size is good for filler in the composite is 140 mesh particles. Marble composite particles 140 mesh particle size has a flexural strength and hardness highest, because SEM photograph composite of 140 mesh particle distribution in the matrix evenly, and there is a good bond between the matrix and particles of marble statuary. Keywords: Marble statuary, composite, particle size marble, epoxy , the mechanical properties
PENGARUH UKURAN FLY ASH PADA KEKUATAN BENDING KOMPOSIT RESIN EPOXY Yusman Zamzami; Shirley Savetlana; Gusri Akhyar Ibrahim
Jurnal Ilmiah Teknik Mesin Vol 1, No 4 (2013)
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Fly ash is one of the solid waste generated by industries that use coal as a fuel for the production process. Fly ash contains silica or alumina silica that has no adhesive properties (cementation) to himself. The purpose of this research was to determine the bending strength of composites reinforced fly ash (coal waste) through the bending test. In this study, fly ash was sieved with a sieve to obtain a variation of fly ash particle size of 40 mesh, 80 mesh and 120 mesh. Composite manufacturing using hand lay up with a mixture ratio of epoxy resin and hardener 1:1. Next step is mixing matrix and fly ash with mass fraction 60%: 40% use of fly ash particle size variation. Transform and then testing bending and for pure epoxy resin composites with various particle sizes. Photo fracture area with Scanning Electron Microscope (SEM) was used to analyze the causes of failure in composites. In this study the mechanical properties of the composite bending test in accordance with ASTM D790. The test results showed that the bending strength of the composite teringgi achieved with fly ash particle size of 120 mesh, the bending strength of 59.26 N/mm2 obtained. Factors that affect the bending strength is power tie fly ash particles with the matrix, the distribution and number of particles are evenly distributed in the composite particles. SEM image results in the fracture of composite particles of fly ash shows the tie between the matrix and the particles are quite good. Keywords: Fly ash, composite, bending strength

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