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Redaksi Jurnal Rekayasa Mesin Jurusan Teknik Mesin Fakultas Teknik, Universitas Brawijaya Jl. MT. Haryono 167 Malang, Jawa Timur Indonesia 65145
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Jawa timur
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Rekayasa Mesin
Published by Universitas Brawijaya
ISSN : 23381663     EISSN : 24776041     DOI : 10.21776/ub.jrm
Core Subject : Engineering,
Mechanical Engineering
Rekayasa Mesin is published by Mechanical Engineering Department, Faculty of Engineering, Brawijaya, Malang-East Java-Indonesia. Rekayasa Mesin is an open-access peer reviewed journal that mediates the dissemination of academicians, researchers, and practitioners in mechanical engineering. Rekayasa Mesin accepts submission from all over the world, especially from Indonesia. Rekayasa Mesin aims to provide a forum for national and international academicians, researchers and practitioners on mechanical engineering to publish the original articles. All accepted articles will be published and will be freely available to all readers with worldwide visibility and coverage. The scope of Rekayasa Mesin are the specific topics issues in mechanical engineering such as design, energy conversion, manufacture, and metallurgy. All articles submitted to this journal can be written in Bahasa and English Language.
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Articles 13 Documents
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Search results for , issue "Vol 5, No 3 (2014)" : 13 Documents clear
Pengaruh Waktu Pemanasan (Anil) terhadap Ketahanan Korosi pada Gelas Metalik Berbasis Zirkonium Anggriawan, Ongki Budi; Choiron, Moch. Agus; Lin, Jing Chie
Jurnal Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

The effects of annealing time on the corrosion resistance of a Zr-based bulk metallic glass (BMGs) were studied. The Zr 48 Cu 36 Al 8 Ag BMGs annealed at the temperatures of 471 oC for 0, 23 and 27 min respectively. The partially and fully crystallized was identified by differential thermal analysis (DSC) and by X-ray diffraction (XRD). The corrosion resistances of those BMGs was identified by open circuit potential (OCP), Tafel plot (TP), dan cyclic anodic potentiodynamic polarization (CAPD). The results show that the as-cast of Zr 8 48 Cu 36 Al BMGs (0 min, full amorphous) has higher corrosion resistance than that of the annealing specimen for 23 and 27 min, while the fully crystallized specimen (27 min) has worst corrosion resistance when compared to the other samples in 0.1 M NaCl solution. The improvement of the corrosion resistance for as-cast (0 min) is better than annealed specimen (23 and 27 min), because the as-cast does not have defects like grain boundary (full amorphous). When the annealing time is longer (27 min), the crystallites grow up (more boundary regions), therefore increasing the susceptibility to the localized corrosion.Keywords: Metallic glass, Zr-Cu-Al-Ag, corrosion, NaCl
Analisis Fatigue Failure Suhu Rendah Struktur Batang Duralumin dengan Mesin Siklus Bending Tawaf, Nanang; Suprapto, Wahyono; Purnowidodo, Anindito
Jurnal Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Generally non-iron metals use in industries, including aluminum alloy, because of their high strength to weight ratio and favorable (no sparking and high corrosion resistance). Aluminum alloy are often found and used in airplane. Recently, aluminum alloy begins so popular in cryogenic system where it is highly applied at oil industry, low temperature operated, and automotive industry. It is estimated that 50%-90% mechanical failures are due to fatigue failure. This research attempts to predict duralumin fatigue resistance at low temperature and to understand the effect of micro structure on duralumin at low temperature. Several states, which include 15, 30, and 45 in MPa, are given to bending cycle machine. The tested material is duralumin (alloy Al-Cu) which has passed the tests over porosity, fatigue level at low temperature (-19o C) and room temperature (27o C), microstructure, fractography, and macrostructure. Result of research indicates that fatigue resistance increases with lowering work tense at specimen. Average fracture of duralumin fatigue at low temperature is more than 17,8 x 10 cycles, while at room temperature is 13 x 10 5 cycles. During low temperature fatigue test, microstructure shows long and small grains. The deformation during low temperature fatigue test cause smaller grain produce greater slip resistance for specimen.Keywords: Fatigue Failure, Low Temperature, Duralumin, Bending Cycle
Pengaruh Variasi Jumlah Gigi Wheel terhadap Perbandingan Kontak serta Kecepatan Luncur Spesifik untuk Jumlah Gigi Pinion Minimum Sutikno, Endi
Jurnal Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

At the point of contact with the pinion and wheel surface contour of each involut produce different tangential velocity direction and magnitude, consequently normal component as sliding velocity will be different as well so as to produce friction or glide. This study looked at the effect on the speed of specific sliding pinion and gear wheel on a pair with a standard tooth profile involut fulldepht the pressure angle  gear module m on the condition minimum number of theoretical pinion tooth N wheel tooth number variation N 2 . The implementation of simulation research using Excel. Maximum specific sliding speed pinion occur at the initial point of contact K 2 275 1 module m = 5mm, pressure angle  = 32 and number of teeth N 2 = 4 wheel drive conditions under which p  = -165,150 at the point of escape/retreat contact K 1 on the same parameters K2 p  = 0.5084. The specific slidding velocity maximum wheel occurs at the point of contact K K1 at the module off m = 1.5 mm, angle = 10   press and N 2 1 = number of teeth wheel drive 46 under the condition that w  = -119.808 minimum occur at the same parameters in the initial point of contact K K1 2 w  = 1.Keyword : wheel numbers teeth, pressure angle, contact ratio, slidding velocity, specific slidding velocity
Pengaruh Crash Box Berbentuk Tabung 2 Segmen terhadap Kemampuan Menyerap Energi Impak dengan Simulasi Komputer Asroni, Asroni; Choiron, Moch. Agus; Purnowidodo, Anindito
Jurnal Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Crash Box is a very important part as absorbing impact energy, especially in the frontal crash case. The purpose of this study was to determine the optimal design on two circular cross sections Crash Box to its ability to absorb impact energy and deformation pattern. The independent variable in this study were length, and thickness of the Crash Box with length of tube 1 (h ) = length of tube 2 (h 2 ) = 40, 50, 60 mm and thickness of tube 1 (t 201 1 1 ) = thickness of tube 2 (t ) = 2,5 ; 3 ; 3.5 mm were analyzed by the Taguchi method.The dependent variable is the energy absorbed and the deformation that occurs in Crash Box due to the impact test (Impactor) and is measured by using finite element-based software which is Ansys 14.5. Based on data from the simulation results, it can be obtained on one circular cross section Crash Box has the ability to absorb the energy of 2762.89 A. For optimum design of two circular cross sections Crash Box has the ability to absorb the energy of 4435.04 J. Optimum design of Crash Box has length of tube 1 (h 1 ) = 40 mm, length of tube 2 (h 2 ) = 60 mm, thickness of tube 1 (t ) = 3.5 mm, thickness of tube 2 (t ) = 3 mm. From the deformation pattern analysis, it can be seen that the deformation in the Crash Box can be divided into 2 types: Concertina mode (bending on the Crash Box walls is symmetric) and Diamond Fashion (bending on the Crash Box walls is not symmetrical).Keywords: Crash Box, Simulation, Energy, Deformation, Sectional Shape, Buckling.
Simulasi Komputer pada Optimasi Desain Hybrid Plating dalam Proses Bone Healing Mamungkas, Mohamad Irkham; Choiron, Moch. Agus; Suprapto, Wahyono
Jurnal Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Hybrid plating method that combine locking screw and non-locking screw usually used for healing on bone fracture. This methodusedin order to get the smallestdeflectionandpreventpullout. The research purposed to obtain the optimal parameter design locking screw, such as position of locking screw, thickness and width plates by using Taguchi method which obtained level and variations factor. The material used in this study for screw and the plate were stainless steel SS 316 L. The load model used axial load of 1000 N. The number of hole plates were 8, which 4 holes in each section. In one section consist of locking screw and non locking screw Quasi experimental model applied ANSYS Workbench 14.5 finite element software. Results showed the optimum design was 3 locking scews in the left position, the thickness 4 mm and a width of plate 16 mm. The optimum design produce 0,039507 mm of average deflection and it can be denoted that failure and pull out was not occurred.Keywords : Hybrid Plating, Simulation, Deflection, Pull Out
Studi Numerik Pengaruh Variasi Jumlah Saluran Masuk Pressure Swirl Atomizer Terhadap Karakteristik Spray Purnami, Purnami
Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

This research was conducted to determine the effect of inlet channel number on the spray characteristics of the pressure swirl atomizer using numerical methods. The observed spray characteristics were spray cone angle and discharge coefficient. Pressure swirl atomizer is a nozzle that can atomize fluid using vortex fluid in the mixing chamber, the magnitude of the vortex fluid is affected by the tangential velocity component of fluid at the nozzle inlet. Number of nozzle inlet was varied at 1, 2 and 4 channel. Total surface area of the inlet was kept constant of 1.76 mm 2 for all variation. The fluid used in this study were diesel and Reynolds number was varying at 2000, 2500, 3000, 3500 and 4000. The result show that with the increasing of inlet channel number at a fixed Reynolds number will generate spray with larger spray cone angle. This is due to tangential velocity compunentand swirling flow in mixing chamber increasewith the increasity of inlet channel number. This phenomena ruselt higher spray cone angle. Discharge coefficient also increase with the increasity of inlet channel number. This conditionshow that losses inside nozzle with 4 inlet channel number is smaller than that with less inlet channel number.Keywords: Pressure swirl atomizer, Spray characteristics, Amount of inlet channel, Numerical method.
Pengaruh Temperatur pada Proses Hot Isostatic Pressing terhadap Porositas, Keausan dan Mikrostruktur Sludge Powder Duralumin Multazam, Ahmad; Suprapto, Wahyono; Pratikto, Pratikto
Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Abstract

Sludge is the starting raw material in the process of forming wheels with forging method. Performance wheels strongly influenced by the quality of sludge. Sludge should have physical properties that light , soft and easy strengthened. One material that can be used as materials for sludge are: duralumin material. Duralumin is another name for aluminum & copper alloy (Al / Cu) with a Cu content of about 4 %. Making sludge powder duralumin with powder metallurgical methods can improve the quality of sludge.Making the specimen begins to weigh 100 g of powder duralumin and enter into a mold that has been in the preheating (100 ° C). Wait about 10-15 minutes until the mold temperature reached (450 ° C), (475 ° C) , (500 ° C) , and (525 ° C). Perform (hot iso- static pressing) HIPing by using a hydraulic press machine at 50 MPa and kept constant for 30 minutes. After the specimens were removed from the mold. The results showed the higher temperature tends to result in a percentage sitering porosity and wear rate decreases. This is evidenced by the percentage of porosity at a temperature of 450 ° C , 475 ° C , 500 ° C , and 525 ° C is 1.193 ° C , 1:03 ° C , 0757 ° C and 0733 ° C. While the wear rate at the sintering temperature of 450 ° C , 475 ° C , 500 ° C , and 525 ° C is 0.00095 g / s , 0.00080 g / s , 0.00059 g / s , 0.00050 g / s. Then from the microstructural observations with 500x magnification SEM image shown that with increasing temperature HIPing likely to result looks smooth surface of the test specimen.Keywords: Powder Metallurgy, Temperature HIPing, Duralumin, Sludge, Porosity, Wear, Microstructure.
Model Termal Proses Pengelasan Keliling Multipass Pada Sambungan Pipa API-X70 Darmadi, Djarot B.
Jurnal Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Thermal model is the first step in a welding model which may be coupled with mechanical and/or metallurgical model andmistakes in thermal model mislead the next steps. This paper discusses validated thermal model using transformed volumetric Goldak’s heat source model. Birth and death technique was used to represents growing weld bead. Well matched temperature histories of the model and measurements confirmed the correctness of the proposed thermal model.Keywords : Thermal model, Transformed heat source, Birth and death technique
Selubung Radiasi Untuk Efisiensi Penggunaan Energi Pada Kompor Gas Widodo, Agung Sugeng
Jurnal Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Stove cover is a device to reduce radiation and convection heat transfer processes in a gas stove. In a condition of energy crisis recently and along with government program in oil (BBM) conversion into gas (BBG) initially in 2007, therefore an effort to conserve energy relating to BBG is needed to be performed.The aim of this research is to investigate the influence of material cover to the efficiency of conventional gas stove. Using three different materials of ceramic, aluminum and iron, the efficiency of conventional gas stove was analysed by measuring combustion energy produced by LPG, cover surface and water temperature used for cooking procces. The results showed that ceramic is the effective material as stove cover compared to aluminum or iron because ceramic have a specific heat and thermal conductivity lower than aluminum or iron. Using ceramic cover, the efficiency of conventional gas stove was increased of 2.6% to the highest efficiency of 46,6% compared to previous gas stove without cover. Ceramic cover also indicated a good characteristic for covering heat release at the initialy cooking process.Keywords: wheel numbers teeth, pressure angle, contact ratio, slidding velocity, specific slidding velocity
Analisis Penyerapan Energi Kinetik pada Berbagai Variasi Kecepatan dan Inersia Flywheel Faizun, Muhammad Muhtada; Basuki, Hari Arbiantara; Mulyadi, Santoso
Jurnal Rekayasa Mesin Vol 5, No 3 (2014)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

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Kinetyc Energy Recovery system (KERS) is a mechanism of non convensional breaking system to absorb and recovery kynetic energy from breaking desseleration by the vehycle asstep of increasing vehichleeficiency. At this moment Kinetyc Energy Recovery system (KERS) are applycated on high speed vehicle, hybrid vehicle, and heavy duty vehicle, usually F1 race car, FerraryEnzo sport car, Flybus and modern truck. The absorbtion of kynetic energy use flywheel. Kynetic energy is effected by flywheel inertia and duration. The purpose of this research is to know absorbtion of kynetic energy from flywheel with 2 various of inertia from KERS type mechanism and wheel velocity various between 800rpm until 1800rpm. This research was done at Design Laboratory of Mechanical Direction Engineering Faculty of Jember University. Conclusion from the research is the biggest absorbtion energy in flywheel from various inertia 0,0317kg.m 2 at 1800rpm are 23.210,72 Joule.Keywords: Kinetyc Energy Recovery system (KERS), flywheel, Inersia, kynetic energy, absorbed energy

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