cover
Filter by Year

Analysis
Journal of Mechanical Science and Engineering
Published by Universitas Sriwijaya
Articles
10
Articles
Mechanical Behavior of Medium Carbon Steel welded with SMAW And Corroded with Sea Water

Pratiwi, Diah Kusuma ( Lecturer of Department of Mechanical Engineering,Sriwijaya University ) , Rasyidi, Rasyidi ( Technique Faculty, Department of Mechanical Engineering Prof. Dr. Hazairin, SH. University Bengkulu )

Journal of Mechanical Science and Engineering Vol 2, No 1 (2015): Journal of Mechanical Science and Engineering
Publisher : Sriwijaya University

Show Abstract | Original Source | Check in Google Scholar |

Abstract

The problem of  metal corrosion is a very serious to be observed, especially the corrosion of medium carbon steel because it can reduce the economic value of the metal. Corrosion of carbon steel is influenced by the environmental conditions. This paper discusses the effect of the corrosion rate of medium carbon steel with SMAW welding and corrodes it with sea water during several hour. Electrodes of AWS A5.1E7016 type were used in the welding. The test results show that the medium carbon steel which was corroded with sea water has small weight loss. It seem that the weight loss has small influence on the mechanical behavior of the metal. For the welded medium carbon steel, the ultimate strength and surface hardness are smaller than the un-welded one. The microstructure of welded medium carbon steel has unsimilar structure with un-welded steel because it has about the same amount of ferlite, ferrite and martensite.

Darrieus Water Turbine Performance Configuration of Blade

Sahim, Kaprawi ( Lecturer of Master Program Mechanical Engineering, Sriwijaya ) , Santoso, Dyos ( Lecturer of Master Program Mechanical Engineering, Sriwijaya ) , Jaini, Jaini ( Student of Master Program Mechanical Engineering, Sriwijaya University )

Journal of Mechanical Science and Engineering Vol 2, No 1 (2015): Journal of Mechanical Science and Engineering
Publisher : Sriwijaya University

Show Abstract | Original Source | Check in Google Scholar |

Abstract

Horizontal axis Darrieus water turbines, very suitable for use in river flows in the utilization of the kinetic energy. Water turbines studied in this test, is a six-blade Darrieus water turbines. Tests using three configuration of blade arrangements, with conditions rotor sink and drown half. Tests carried out in the watershed Ogan at the village Tabuan Ogan Komering Ulu of South Sumatra Histories. Research results obtained on each configuration of blade, the condition of the rotor and the rotor sink half drowned. High efficiency configuration occurs in parallel arrangement with the condition of the rotor blade sank half.

THE EFFECT OF STEERING BLADE ANGLES OF HELICAL TURBINE FOR POWER GENERATION IN IRIGATION DAM OF

Sipahutar, Riman ( Lecturer of Magister Program Mechanical Engineering, Sriwijaya University ) , Niharman, Niharman ( Student of Magister Program Mechanical Engineering, Sriwijaya University )

Journal of Mechanical Science and Engineering Vol 2, No 1 (2015): Journal of Mechanical Science and Engineering
Publisher : Sriwijaya University

Show Abstract | Original Source | Check in Google Scholar |

Abstract

The Gorlov vertical axis water turbine is suitable to harness the water flow in the creation of kinetic energy for the irigation dam. The turbine tested in this study was ther Gorlov helical turbine blade with steering angles of 00, 300, 450 and 600 turbine diameter (d) of 0.30 m, height (h) of 0.50 m and the NACA 0020 profile. The testing was conducted on the irigation dam of Seluma Bengkulu. The water flow showed in the velocity (Uair) of  0.85 m / s and a round (n) of 110 rpm. The results were achieved by setting the blades in steering torque coefficient (Ct) of 0.309 are turbine efficiency (ηt) of 28.5% and a power turbine (Pt) of 13.699 Watts.

Effect of Cooling Water Fraction Of Salt in Low Carbon Steel Properties

Ahmadin, Ahmadin ( Mechanical Engineering ) , pratiwi, Diah kusuma ( Fakultas Teknik Mesin )

Journal of Mechanical Science and Engineering Vol 2, No 1 (2015): Journal of Mechanical Science and Engineering
Publisher : Sriwijaya University

Show Abstract | Original Source | Check in Google Scholar |

Abstract

Low carbon steel plate is widely used in the field of construction that require high hardness and ductility . One method used to increase the hardness of the low carbon steel plate that is by quenching water plus salt . The results showed that the quenching is based on a study of 10% salt water has a hardness of 168 VHN with σu = 33.62 , ε = 12 % and the lowest is 15 % salt water quenching VHN 101 σu = 30.30 and ε = 7.30% composition of the study above was 10 % salt solution in the cooling water will cause a decrease in mechanical properties .

The Influence of Matrix Banana Stem Fiber Volume Fraction Recycled Polypropylene (RPP) toward Bending Test

Kusuma, Diah Pratiwi ( Pengajar Pasca Sarjana Jurusan Teknik Mesin Fakultas Teknik Universitas Sriwijaya ) , Chandra, Hendri ( Pengajar Pasca Sarjana Jurusan Teknik Mesin Fakultas Teknik Universitas Sriwijaya ) , Rajagukguk, Tumpal Ojahan ( mahasiswa pasca sarjana program studi mesin fakultas teknik unsri )

Journal of Mechanical Science and Engineering Vol 1, No 1 (2013): Journal of Mechanical Science and Engineering
Publisher : Sriwijaya University

Show Abstract | Original Source | Check in Google Scholar | Full PDF (274.262 KB)

Abstract

ABSTRAKSerat alam telah terbukti sebagai material yang kuat, mampu untuk menggantikan serat sintetik sebagai penguat. Serat batang pisang kepok yang memiliki kekuatan tarik 68,44 MPa dengan bundalan rata-rata 0,698 mm salah satu serat yang memiliki potensi sebagai penguat untuk polymer material komposit. Pada material komposit bermatriks recycled polypropylene (RPP) berpenguat serat batang pisang kepok dapat menahan beban yang diterima material komposit. Sedangkan recycled polypropylene (RPP) sebagai pengikat serat batang pisang, bekerja menahan beban dan melindungi serat dari kerusakan.  Hasil pengujian yang paling optimal terdapat pada volume fraksi 35% fiber : 65% matriks dengan  tegangan bending 122,09 N/mm2, modulus elastisitas 2975 MPa, momen bending 126,59 N/mm2 dan tegangan lentur 64,34 MPa. Pada pengamatan SEM fraksi volume 35% filler : 65% matriks paling optimal karena adanya ikatan matriks dan serat menyatu dengan sempurna. Dari penelitian ini dapat disimpulkan bahwa pengaruh fraksi volume serat batang pisang kepok sebagai penguat (fiber) dan recycled polypropylene (RPP) sebagai pengikat (matriks) pada material komposit akan mempengaruhi kekuatan material komposit lebih kuat dan getas. Apabila ditinjau dari keseluruhan pengujian yang dilakukan maka fraksi volume yang paling optimal terdapat pada fraksi volume 35% filler : 65% matriks.

Characteristics of Mixture fuel of Biodiesel from Waste Cooking Oil and Solar used as fuel in Diesel Engine

Arita, Susila ( Chemical Engineering Department Faculty of Engineering Sriwijaya University ) , Kadir, Marwani Zahri ( Mechanical Engineering Department Faculty of Engineering Sriwijaya University ) , Miskah, Siti

Journal of Mechanical Science and Engineering Vol 1, No 1 (2013): Journal of Mechanical Science and Engineering
Publisher : Sriwijaya University

Show Abstract | Original Source | Check in Google Scholar | Full PDF (260.956 KB)

Abstract

Abstract Biodiesel from waste oil fried food out of fuel can be used as an alternative to replaced diesel fuel or diesel. Biodiesel blended with diesel (B0) at the level of a certain ratio so obtained B5, B10, B15 and B20 (B5 is a mixture of 5% biodiesel and 95% diesel, etc.) is used as fuel in diesel engines. Then tested for their physical properties such as heating value, cetane number, and flash point. Performance compared to diesel engines that use diesel engines (B0). Engine operated on constant engine revolution in 1500, 1750, 2000, 2250 and 2500 rpm. From the test results in fact indicate that the B5 fuel to obtain the best performance of the engine at 2000 rpm (engine revolution).. At this engine revolution produced the lowest specific fuel consumption of 0.34 kg / kWh, thermal efficiency of 24.02%  while the effective power on all fuels are the same ie 1:26 kw .   Keywords: Biodiesel, cooking oil, diesel fuel, diesel engine

Influence of Blending of Diesel Certified and Biodiesel CPO on Efficiency of 60 MMT SB Boiler Type

Sumardi, Novia ( Chemical Engineering Department Faculty of Engineering Sriwijaya University ) , Ellyanie, Ellyanie ( Mechanical Engineering Department Faculty of Engineering Sriwijaya University ) , Moeksin, Rosdiana ( Mahasiswa Pasca Sarjana Prodi Teknik Mesin Fakultas Teknik Unsri )

Journal of Mechanical Science and Engineering Vol 1, No 1 (2013): Journal of Mechanical Science and Engineering
Publisher : Sriwijaya University

Show Abstract | Original Source | Check in Google Scholar | Full PDF (124.227 KB)

Abstract

Abstract Combustion is the process of mixing  oxygen and carbon in speed and produces heat. Oxygen  from the air, while carbon derived from fuel. Combustion  boilers as a chemical process of unification of the fuel and oxygen from the air with the speed of a particular reaction that produces energy. Calculation of the combustion process is the starting point  the design of boilers, furnaces and other appliances that generate heat from the combustion process derived from the number of elements involved in a chemical reaction, the amount of heat generated and the efficiency of combustion. The fuel is a mixture of diesel and biodiesel certified crude palm oil, ratio B0, B5, B10, B15, B20, B30 testing using Fire Tube BoilersSB60MMT. From the ultimate analysis and dry flue gas emissions (gas Analyzer), then calculated based on stoichiometric combustion and efficiency using the indirect method, the calculation results obtained from the more mixed crude palm oil biodiesel is added then the content of SO2, CO, NOx  increasingly reduced. Also obtained the largest heat loss due to dry flue gas and 8,209% heat loss due to evaporation of water formed in  H2 fuel efficiency of 7,002% to 85.637% on the  blend B20. Keywords: Solar Certified, CPO Biodiesel, Fire Tube Boilers, Emissions, Effici

Effect of The Pressure of the Squeeze Process on the Hardness and Micro Structure of Recycled Aluminum Materials

Nukman, Nukman ( Program Pasca Sarjana Jurusan Teknik Mesin Universitas Sriwijaya ) , Yanis, Muhammad ( Program Pasca Sarjana Jurusan Teknik Mesin Universitas Sriwijaya ) , kurrahman, taufik ( Politeknik sriwijaya )

Journal of Mechanical Science and Engineering Vol 1, No 1 (2013): Journal of Mechanical Science and Engineering
Publisher : Sriwijaya University

Show Abstract | Original Source | Check in Google Scholar | Full PDF (231.025 KB)

Abstract

Ringkasan Proses pengecoran squeeze menghasilkan produk yang mendekati ukuran akhir dengan kualitas yang baik. Struktur mikro hasil pengecoran squeeze tampak lebih padat, homogen dan sifat mekanik yang baik bila dibandingkan dengan hasil pengecoran tuang. Material yang dipergunakan daur ulang alumunium berupa 25 kg piston, 25 kg velg dan 25 kg berupa campuran (kanvas rem, tutup mesin, dan perabotan rumah tangga) yang di lebur didalam dapur dan proses pencetakan sistem dengan proses DSC. Logam cair dituangkan ke dalam die pada temperatur 750°C, lalu dipres dengan selama 60-70 detik. Proses pemberian tekan di mulai pada penekan 30 MPa dengan durasi penekanan 75 detik. Ulangi untuk penekanan 50,70,90,110 MPa, 130 dan 150 Mpa. Kemudian benda cor di keluarkan dari die (cetakan). Hasil pengujian Komposisi hasil daur ulang alumunium 84,75 % Al dan 8,985 % Si, dengan tingkat kekerasan permukaan pada tekanan 130 MPa sebesar 89,74 HBN. Proses pengecoran squeeze meningkatkan kekerasan permukaan sebesar 22 % Proses pengecoran squeeze meningkatkan kekerasan permukaan sebesar 22 %. Kekerasan permukaan hasil squeeze sangat di pengaruhi oleh temperatur penuangan, waktu penekanan dan besarnya gaya penekanan. Struktur mikro material cenderung merapat dan memendek seiring dengan peningkatan tekanan yang diberikan. Kata Kunci : Pengecoran Squeeze, Struktur mikro dan Kekerasan. Abstract Squeeze casting process to produce products that approach the final size with good quality. Squeeze casting microstructure results appear more dense, homogeneous and good mechanical properties when compared with the results of foundry castings. Recycled materials used in the form of 25 kg piston aluminum, 25 kg and 25 kg wheel in the form of a mixture (brake, engine cover, and household items) are in the process of melting and molding in the kitchen with the DSC system. molten metal into the die at a temperature of 7500C, and then pressed for 60-70 seconds. The process of granting press at start at 30 MPa pressure with a duration of 75 seconds emphasis. Repeat for emphasis 50,70,90,110 MPa, 130 and 150 MPa. Then remove it from the body in die cast (mold). Results of testing of recycled aluminum composition 84.75% Al and 8.985% Si, with surface hardness 130 MPa at a pressure of 89.74 HBN. Squeeze casting process increases surface hardness by 22% squeeze casting process increases surface hardness by 22%. Hardness of squeeze surface is influenced by the pouring temperature, the time pressure and the force suppression. Microstructure of the material tends to move up and retracts with increasing applied pressure. Keywords: Squeeze Casting, Microstructure and Hardness.

The Carburizing Process of Low Carbon Steel with Charcoal Media

Yahya, Yahya ( Program Pasca Sarjana Jurusan Teknik Mesin Universitas Sriwijaya ) , Nukman, Nukman ( Staf Pengajar Program Pasca Sarjana Jurusan Teknik Mesin Universitas Sriwijaya ) , Chandra, Hendri ( Staf Pengajar Program Pasca Sarjana Jurusan Teknik Mesin Universitas Sriwijaya )

Journal of Mechanical Science and Engineering Vol 1, No 1 (2013): Journal of Mechanical Science and Engineering
Publisher : Sriwijaya University

Show Abstract | Original Source | Check in Google Scholar | Full PDF (234.502 KB)

Abstract

Ringkasan Proses karburisasi dilakukan untuk meningkatkan mutu kekuatas suatu baja karbon rendah dengan biaya yang rendah. Material yang digunakan adalah jenis baja karbon rendah dengan nilai karbon 0,25. Proses karburisasi pada baja karbon rendah dilakukan pada temperatur 900oC dengan holding time 90 menit menggunakan media arang tulang kambing dan tempurung kelapa. Penggunaan karburiser arang tulang kambing menghasilkan nilai kekerasannya lebih tinggi dari baja karbon dengan media arang tempurung kelapa. Hasil pengujian nilai karbon baja setelah proses karburisasi dengan tempurung kelapa adalah 0,423 sedangkan setelah proses karburisasi dengan tulang kambing nilai karbon nya hanya 1,593. Kata Kunci : Proses Karburisasi, Uji kekerasan, Uji Tarik, Uji Impak, dan struktur mikro. Abstract Carburizing process is carried out to improve the power quality of a low carbon steel with a low cost.The material used is a type of low carbon steel with a carbon value of 0.25. Carburizing process on medium carbon steel at a temperature of 900°C with a holding time of 90 minutes using goat bone and coconut shel char medial. The use of goat  bone charcoal karburiser produces higher hardness values of carbon steel with coconut shell charcoal media. Results of testing the value of carbon steel after carburizing processes with coconut shell was 0,423 whereas after carburizing process with goat bone carbon value of only 1,593 Keywords: carburizing process, hardness test, Tensile Test, Impact Test, and microstructure.

New Performance with Matrix Composites of Used Plastic, Fiber of Red Pinang Sheath and Bamboo

Nukman, Nukman ( Fakultas Teknik Mesin. Universitas Sriwijaya. ) , hadi, qomarul ( Fakultas Teknik Mesin. Universitas Sriwijaya. ) , Fusito, Fusito ( Fakultas Teknik Mesin. Universitas Sriwijaya. )

Journal of Mechanical Science and Engineering Vol 1, No 1 (2013): Journal of Mechanical Science and Engineering
Publisher : Sriwijaya University

Show Abstract | Original Source | Check in Google Scholar | Full PDF (391.592 KB)

Abstract

Ringkasan Pemanfaatan plastik bekas menjadi komposit, khususnya berbahan plyproplene (PP) telah dapat dilakukan dengan cara menambahkan serat Bambu dan Pelepah Pinang Merah. Matriks PP dipanaskan dalam satu alat pemanas untuk dicairkan kemudian ditambahkan masing-masing serat alam bambu dan juga pinang merah. Hasil pengujian sifat mekanik telah dibandingkan matriks tanpa penambahan serat dengan matriks yang berserat. Pengujian menujukkan bahwa sifat mekanik dari kompisit telah meningkat dengan penambahan serat alami. Kekuatan mekanik dengan penambahan serat bambu lebih besar daripada penambahan dengan serat Pinang Merah. Kata Kunci: Polyproplene, serat Bambu, serat Pinang Merah, Komposit, Kekuatan Mekanik. Utilization of scrap plastic to composite, especially made ​​plyproplene (PP) has to be done by adding fibers and sheaths Pinang Red Bamboo. PP matrix is heated in the heater melted then added to each of the natural bamboo fiber and red nut. Mechanical properties of the test results have been compared with the fiber-matrix without the addition of a fibrous matrix. Tests showed that the mechanical properties of kompisit has increased with the addition of natural fibers. Mechanical strength with the addition of bamboo fiber is greater than the addition of the Red Pinang fiber. Keywords : polyproplene, Bamboo fiber, fiber Pinang Merah, Composite, Mechanical Strength.