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INDONESIA
Jurnal Teknik Mesin
Published by Institut Teknologi Padang
ISSN : 20894880     EISSN : 25988263     DOI : https://doi.org/10.21063/jtm
Core Subject : Science, Engineering,
Control & Systems Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
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. JTM is managed to be issued twice in every volume (April and October). The Scope of JTM is: Energy Science and Engineering Applied Mechanics and Materials Design, Manufacturing and Product Development Control, Instrumentation and Robotics
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 209 Documents
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PENGARUH VISKOSITAS MEDIA CELUP TERHADAP KEKERASAN DAN STRUKTUR MIKRO MARTENSITIC WHITE CAST IRON ASTM A532 Subardi; Ratna Kartikasari; Achmad Supiani
Jurnal Teknik Mesin Vol 1 No 1 (2011): Jurnal Teknik Mesin Vol.1 No.1 October 2011
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (498.447 KB) | DOI: 10.21063/jtm.2011.v1.i1.41-45

Abstract

Besi tuang putih memiliki keunggulan yaitu tahan aus, tahan korosi, kekuatan dan keuletan yang tinggi serta tahan terhadap perubahan suhu Besi tuang putih banyak digunakan pada industri pembuatan roda kereta api, rol untuk menggerus (grinding), dan plat penghancur batu. Kelemahan dari besi tuang putih tersebut adalah ketahanan terhadap keausan belum maksimal. Peningkatan ketahanan terhadap keausan salah satunya dengan proses heat treatment. Tujuan penelitian ini untuk mengetahui pengaruh viskositas pada media celup terhadap kekerasan dan struktur mikro besi tuang putih martensitik ASTM A532. Spesimen besi tuang putih martensitik ASTM A532 merck Cr 12, CR 17, CR 21 dengan ukuran 15 mm x 10 mm x 10 mm, selanjutnya dilakukan proses uji komposisi, heat teatment dengan suhu 900ºC ditahan 30 menit, lalu dicelupkan media oli dengan viskositas SAE 10, SAE 30, SAE 50. Pengujian meliputi uji kekerasan vickers dan pengamatan struktur mikro. Hasil pengujian komposisi kimia menunjukkan ASTM A532 CR12 mempunyai unsur C (carbon) sebesar 1.75% dan unsur Cr (Chromium) sebesar 14.24% masuk dalam kategori golongan besi tuang putih martensitik ASTM A532 Type A. ASTM A532, pada spesimen CR17 mempunyai unsur C (carbon) sebesar 2.15%, unsur Cr (Chromium) sebesar 17.90%, masuk golongan ASTM A532 Class II Type B. Dan Cr21 mempunyau unsur C (carbon) sebesar 3,15%, unsur Cr (chromium) sebesar 19,25% termasuk golongan ASTM A532 Type E. Hasil struktur mikro ASTM A532 terdiri dari struktur martensit, perlit dan Carbida Cr. Hasil pengujian kekerasan media quenching oli (SAE 10, SAE 30 dan SAE 50) untuk merck CR 12, CR 17, CR 21 nilai kekerasan berbeda jauh (signifikan). Kekerasan tertinggi dari ketiga merck besi tuang putih adalah CR 12 sebesar 1017,5 Kg/mm² pada quenching SAE 10, struktur martensit menjadi berkurang namun carbida Cr bertambah sehingga kekerasan menjadi tinggi. Dan kekerasan terendah pada CR 21 yaitu 600,1 Kg/mm² pada quenching SAE 50, pemanasan akan menurunkan jumlah martensit dan carbida sehingga kekerasan menurun.
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 Vol 10 No 2 (2020): Jurnal Teknik Mesin Vol.10 No.2 October 2020
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1056.99 KB) | DOI: 10.21063/jtm.2020.v10.i2.102-108

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 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.
PENGARUH ORIENTASI SERAT PADA KOMPOSIT RESIN POLYESTER/ SERAT DAUN NENAS TERHADAP KEKUATAN TARIK Hendriwan Fahmi; Harry Hermansyah
Jurnal Teknik Mesin Vol 1 No 1 (2011): Jurnal Teknik Mesin Vol.1 No.1 October 2011
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (270.935 KB) | DOI: 10.21063/jtm.2011.v1.i1.46-52

Abstract

Pineapple leaf fiber as one of the natural fiber is currently available in high abundance, but not utilized and discarded as waste. Pineapple leaf fibers but can still be used as one alternative to natural fiber composite material. Pineapple fiber orientation variation 00 , 00 ; 450 , 00 ; 900 to influence significantly the tensile strength of the composite. There is a maximum tensile strength with orientation 00 ; 450 . From the results obtained using natural fibers found pineapple average of stress composite with fiber orientation 00 = 37,88 N / mm2 , 00 ; 450 = 41,81 N / mm 2 , 00 ; 900 = 39,37 N / mm2 , from the results of this test we can deduce the nature of fiber reinforced resin pineapple can increase the tensile strength.
A SOLAR ASSITED DRYING SYSTEM FOR GREEN TEA M. Yahya
Jurnal Teknik Mesin Vol 1 No 1 (2011): Jurnal Teknik Mesin Vol.1 No.1 October 2011
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (400.177 KB) | DOI: 10.21063/jtm.2011.v1.i1.53-58

Abstract

Indonesia being situated near the equator receives abundant solar radiation and having characterized by an average daily solar radiation of about 600-700W/m2 . This could be contributed as energy sources for drying green tea. This paper present the experimental studies conducted on the herbal tea or green tea using a solar assisted drying system. The drying system has an array of collector with the size 13.8 m2 . The fresh tealeaves form the plantations are first soaked I warm water for five minutes. Next, Water from the tealeaves will be drained out and dried in the chamber. The collector is of the V-Groove type. The system has two fans to circulate air. A 10 kW auxiliary heater is also included and will be on if the temperature of the drying chamber is less than the specified preset temperature of 50oC. A drying chamber of 55oC can be reached at solar radiation levels of 600-700 Wm2 and ambient temperature of 27-34oC. The flow rate is fixed at 15.1 m3 /min. The initial moisture content is 87% (wet basis) and the final moisture content is 54% (wet basis). A total of 12 hours of drying time is required where solar energy contribute about 56% the total energy requirement.
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 Vol 10 No 2 (2020): Jurnal Teknik Mesin Vol.10 No.2 October 2020
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (196.028 KB) | DOI: 10.21063/jtm.2020.v10.i2.109-113

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.
FRETTING PADA SELONGSONG (SHAFT SLEEVE) POMPA SENTRIFUGAL KAPASITAS 900 m3 /jam di PDAM KOTA PADANG Ismet Eka Putra
Jurnal Teknik Mesin Vol 1 No 1 (2011): Jurnal Teknik Mesin Vol.1 No.1 October 2011
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (336.708 KB) | DOI: 10.21063/jtm.2011.v1.i1.59-66

Abstract

Bahan selongsong terbuat dari perunggu (bronze) dengan kandungan Lead dan Tin yang tinggi, termasuk dalam kategori ASTM B584, UNS C93200, memiliki sifat mampu mesin yang baik, kekerasan yang baik, ketahanan terhadap keausan yang baik. Selongsong mengalami keausan berupa lekukan-lekukan yang dalam sehingga terjadinya kebocoran yang tidak diizinkan, yang menyebabkan turunnya daya pompa dan berpengaruh kepada penurunan kapasitas pompa sentrifugal di Water Intake PDAM Kampung Koto Kota Padang – Sumatera Barat. Untuk mengetahui penyebab utama kerusakan sebagai upaya pencegahan kerusakan serupa tidak terulang kembali maka dilakukan serangkaian pengujian meliputi pengujian visual/ makro, pengujian metalografi dengan mikroskop optik, pengujian kekerasan dengan brinnel hardness test, dan pengujian komposisi kimia menggunakan optical emission spectrometry. Dari hasil pengujian diketahui bahwa telah terjadi keausan yang signifikan pada sisi permukaan area penerima beban yang menyebabkan tebal selongsong berkurang dan terlihat adanya lekukan-lekukan yang dalam. Fenomena ini mengarah kepada terjadinya fretting yaitu terbentuknya kerusakan berupa lekukan menggaris sebesar bidang yang bersentuhan dengan gland packing. Akibat gesekan, lapisan pelindung logam menjadi terkelupas oleh gland packing, tetapi logam secara alamiah berusaha kembali membentuk lapisan pelindung untuk melindungi material dasarnya. Proses terkelupas dan terbentuk kembali yang berulang inilah yang membuat lekukan-lekukan menjadi terlihat jelas pada selongsong. Penanggulangan dari permasalahan tersebut dapat diupayakan dengan memperbaiki sistem pendistribusian pelumas selongsong dan gland packing.
The Effect of Circulation of 3% HCL Solution On the Corrosion Rate of Aluminum Ismet Eka Putra; Teguh Burhanuddin
Jurnal Teknik Mesin Vol 10 No 2 (2020): Jurnal Teknik Mesin Vol.10 No.2 October 2020
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2020.v10.i2.114-117

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.
Study of Experimental Vibration Due to Misalignment of Pulley-Belt in Rotary Machine Asmara Yanto; Anrinal; Rozi Saferi; Zultri Memori
Jurnal Teknik Mesin Vol 10 No 2 (2020): Jurnal Teknik Mesin Vol.10 No.2 October 2020
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2020.v10.i2.118-122

Abstract

This study aims to investigate the vibration of rotary machine due to misalignment of its pulley-belt, experimentally. Here, the rotary machine is driven by an AC motor with pulley-belt transmission that positioned on the outer portion of shaft-rotor. To generate vibration of rotary machine, pulley-belt is conditioned to have a combination of offset and angular misalignments. Offset misalignment variations are 0, 2, 4, and 6 mm and angular misalignment variations are 0ᵒ, 2ᵒ, 4ᵒ, and 6ᵒ. Vibration of rotary machine is measured on the bearing housing by use MEMS-based accelerometers. The measured signal of vibration acceleration is acquired with a data acquisition device to obtain vibration spectrum. From the investigation to vibration spectrum has been done, it can be concluded that vibration of rotary machine has characteristic with dominant frequencies at 1xRPM of shaft and at 1xRPM of motor. The vibration amplitude at 1xRPM of shaft is higher than the vibration amplitude at 1xRPM of motor. From this investigation, it is not possible to find differences in the characteristics of vibrations significantly that occur between vibrations due to offset misalignment, angular misalignment or their combination.
Design, Fabrication and Analysis of Material Requirements of Spices Mixing Machine Rozi Saferi; Asmara Yanto; Jendri Surianda
Jurnal Teknik Mesin Vol 10 No 2 (2020): Jurnal Teknik Mesin Vol.10 No.2 October 2020
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2020.v10.i2.123-130

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%.
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 Vol 10 No 2 (2020): Jurnal Teknik Mesin Vol.10 No.2 October 2020
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2020.v10.i2.131-140

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.

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