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Jurnal Teknik Mesin
Published by Institut Teknologi Padang
ISSN : 20894880     EISSN : 25988263     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Jurnal Teknik Mesin (JTM) is a journal aims to be a peer-reviewed platform and an authoritative source of information. We publish original research papers, review articles and case studies focused on mechanical engineering and other related topics. All papers are peer-reviewed by at least two referees. JTM is managed to be issued twice in every volume (April and October).
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Articles 158 Documents
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The Effect of Hold Time Variation in the Annealing Process To Mechanical Properties and Microstructure of Austenitic Manganese Steel Ilham Azmy; Albert Daniel Saragih
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Manganese steel is a special alloy steel which has good mechanical properties, especially high ductility and toughness values. This steel has high work hardening capability so it will be easy to engineer. In industrial applications, this steel is susceptible to a decrease in the value of its mechanical properties such as the hardness value due to continuous loading. From these problems, a steel engineering process is needed in order to significantly improve the mechanical properties of steel so that it has good durability and lifetime. This study aims to determine the effect of holding time of heat annealing treatment process on the microstructure and mechanical properties of austenitic manganese steel. This research was conducted by heating the annealing process at a temperature of 1000 oC with four variations of holding time for 0, 40, 80, and 120 minutes. After the austenitic manganese steel specimen is heated for a certain time, it is then subjected to very high temperature cooling (in the furnace). The steel specimen is then prepared for metallographic testing and mechanical properties (hardness) testing. Metallographic testing is carried out to be able to analyze the microstructure formed in the austenitic manganese steel specimens after undergoing annealing process. From the metallography results, it was found that the effect of holding time on the annealing process affected carbide precipitation at the grain boundaries in the austenite matrix of manganese steel specimens. In the annealing process with a holding time of 80 minutes, the austenitic manganese steel showed a microstructure with perfect carbide precipitation at the grain boundaries so that this would have an effect on a significant increase in the hardness value. From the results of the hardness test, it was also found that the hardness value of steel specimens by annealing process for 80 minutes was 39.5 HRc. Thus, the effect of the optimal holding time of the annealing heat treatment process to improve the microstructure and mechanical properties (hardness value) is 80 minutes
Design, Fabrication and Analysis of Material Requirements of Spices Mixing Machine Rozi Saferi; Asmara Yanto; Jendri Surianda
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

The process of mixing the spices often done manually, which it takes time and reduces the effectiveness of the process. This study aims to analyze the design, material requirements and production process of a spices mixer machine. In this work is also done to analyze the speed optimization in mixing process of spices with the main food. Analysis of the machine design using the finite element method by aided Autodesk Inventor software. The analysis results show that the mass density of the frame is 8.8041 g/cm3, and the maximum compressive strength is 345 MPa. Furthermore, the young’s modulus is 200 GPa, the position ratio is 0.3 and the shear modulus is 76.9231 GPa. The test of spices mixer machine showed that the optimal spice stirring value occurred at 35 rpm with a mixing percentage of 83%.The process of mixing the spices often done manually, which it takes time and reduces the effectiveness of the process. This study aims to analyze the design, material requirements and production process of a spices mixer machine. In this work is also done to analyze the speed optimization in mixing process of spices with the main food. Analysis of the machine design using the finite element method by aided Autodesk Inventor software. The analysis results show that the mass density of the frame is 8.8041 g/cm3, and the maximum compressive strength is 345 MPa. Furthermore, the young’s modulus is 200 GPa, the position ratio is 0.3 and the shear modulus is 76.9231 GPa. The test of spices mixer machine showed that the optimal spice stirring value occurred at 35 rpm with a mixing percentage of 83%.
The Effect of Volume Fraction on Acoustic Properties of Areca Nut Midrib Fibers Composites with Natural Adhesives Putri Pratiwi; Hendriwan Fahmi; Asmara Yanto; Idel Fitra Soni
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Areca nut Midrib is one of agricultural waste that has many benefits to be recycled for household purposes such as plates, jars and others. Moreover, for many researchers, areca nut midrib fiber was used as a filler of composites material. From several studies it is known that this material has good potential as a filler in composites because of its good mechanical properties. In addition, this material is also considered as a good sound absorber. Therefore, this research will investigate the ability of sound absorption from this material in a various composition. We used Areca nut Midrib fibers as a filler and pine sap as a matrixof composite with a volume fraction of 70%: 30%, 75%: 25%, 80%: 20%, 85%: 15%, 90%: 10%.  The sound absorption coefficient of composites was studied using impedance tube method with 500, 1000 Hz, 1500 Hz, 2000 Hz, and 2500 Hz frequency. The results showed that at a test frequency of 500 Hz, the value of sound absorption coefficient increases with the increase of Areca nut Midrib fraction. This research shown that there is an effect of volume fraction on the acoustic properties  and Areca nut Midrib fiber composite have potential used as sound absorption materials, based on ISO standard 11654:1997.
Experimental Study on Flight Time and Frame Toughness of Quadcopter Based on Waste Polystyrene Paper Mastariyanto Perdana; Meiki Eru Putra; Farid Septio Matrilindo
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Application of natural composite materials for aerial fields has been widely developed. One of the uses of natural composite materials for Unmanned Aerial Vehicle (UAV) frame. In this study, waste polystyrene paper, bagasse powder and eggsheel powder was used for material of UAV frame. Type of UAV was made in this study is quadcopter. Addition of volume fraction of waste polystyene paper to 65 % in green composite material.  The aims this study was determine the flight time and toughness frame of quadcopter based on waste materials. This study showed that there was increase of quadcopter flight time with the addition of  waste polystyrene paper in composites up 65% by volume fraction. Addition of  waste polystyrene paper in composites up 65% by volume fraction, the results showed that the toughness frame of quadcopter was decreased. Photomacro was used to show the stucture and porosity of frame quadcopter based on natural composite material.
Effect of Chromium Doping to Hardness Properties in the Manufacture of Spur Gears Made from Ferrous Powder Albert Daniel Saragih; Slamet Sutjipto
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

A gear is a part of a machine that has a very complex shape so that it requires special care and expertise in the manufacturing process. Powder metallurgy offers an efficient manufacturing process for the production of these complex machining parts. In this study, Cr metal powder was selected to increase the hardness properties of spur gears made from iron (Fe) powder. Doping Cr by 0%; 0.5%; 10%, 1.5% and 2.0% will be added in gear manufacturing. Water is used as a binder with a ratio of 1:15 which is then packed by 15,000 kg or 15 tons then heated or sintered at a temperature of 1200 oC for 1 hour. The shrinkage ratio of the sample to the sintering treatment averaged 4.6%. 0.2 kg of load applied to the Vickers hardness test. Vickers hardness values obtained were 60, 77, 90, 184 and 211 respectively for the Cr doping of 0%; 0.5%; 10%, 1.5% and 2.0%. From these data it is found that the addition of the element Cr increases the hardness properties of iron gears. The hardness value shown is still too small, this is because there is still a lot of porosity generated in the sintering process because it is not in a vacuum condition.
Preventive Maintenance Study on H-25 Gas Turbine Sulaiman Sulaiman; Fahmirullah Fahmirullah
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

This study aims to determine the effect of the time-based maintenance method preventive maintenance, namely major inspection on the efficiency of H-25 gas turbine. The efficiency calculation method based on operating data from the gas turbine. The effect of major inspection can be seen from the compressor efficiency, turbine efficiency and fuel consumption. The results of calculations before the major inspection are 80% of compressor efficiency, 83% of turbine efficiency, and 0.751 kg/kWh of fuel consumption, while after the major inspection, compressor efficiency is 80%, turbine efficiency is 85% and fuel consumption is 0.740 kg/kWh.This study aims to determine the effect of the time-based maintenance method preventive maintenance, namely major inspection on the efficiency of H-25 gas turbine. The efficiency calculation method based on operating data from the gas turbine. The effect of major inspection can be seen from the compressor efficiency, turbine efficiency and fuel consumption. The results of calculations before the major inspection are 80% of compressor efficiency, 83% of turbine efficiency, and 0.751 kg/kWh of fuel consumption, while after the major inspection, compressor efficiency is 80%, turbine efficiency is 85% and fuel consumption is 0.740 kg/kWh.
Kinematics and Singularity Analysis of 2 DOF Planar Parallel Manipulators with Symmetrical Parallelogram Chains Adriyan, Adriyan
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

This paper presented the kinematic and singularity analysis of two degree of freedom planar parallel manipulator or 2DOF PPM, in short, with symmetrical parallelogram chains. There were two configurations of 2DOF PPM that analyzed in this paper, that were 2-ΠΠΠ and 2-ΠΠ. Both PPM were represented on a topology diagram using graphs, respectively. Before conducting a kinematic analysis, 2-ΠΠΠ dan 2-ΠΠ were simplified to an equivalent kinematic chain, which was a well-known 5R kinematic chain. Then, the closed-form solutions for the inverse kinematic and the direct kinematic of the PPM were obtained by using the equivalent kinematic chain. Afterward, the velocity analysis was carried out to acquire Jacobians of the PPM. Hence, the singularity analysis can be performed to investigate singularity conditions that existed on the manipulator using these Jacobians. The singularity analysis showed that three singularity conditions existed on the manipulator, i.e. inverse, direct, and combined kinematic singularity. An insightful schematic was provided to illustrate each singularity condition.
The Effect of Circulation of 3% HCL Solution on the Corrosion Rate of Aluminum Putra, Ismet Eka; Burhanuddin, Teguh
Jurnal Teknik Mesin (JTM) Vol 10, No 2 (2020)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Corrosion is usually called rusting. Corrosion to aluminum is carried out by circulating and non-circulating methods. The specimens were placed in 3% HCl solution, each with 3 specimens in one vessel. There are 9 specimens in 3 vessels. In this study, aluminum was immersed with a circulation of 385 L/hour and 432 L/hour and also without circulation with immersion time for 4 days. The highest corrosion rate was obtained in aluminum soaked in 3% HCl for 4 days with a circulation of 432 L / hour, 0.5215 Mpy. The lowest corrosion rate was obtained for aluminum immersed in 3% HCl for 4 days without circulation, 0.1830 Mpy.

Page 16 of 16 | Total Record : 158

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