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All Journal Rekayasa Mesin Journal Mechanical Engineering
Josef Matheus
Jurusan Teknik Mesin Fakultas Teknik, Universitas Brawijaya
Industrial & Manufacturing Engineering Mechanical Engineering

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Pengaruh Perlakuan Silane Dan NaOH Pada Permukaan Serat Kontinyu Limbah Epulur Sagu (Metroxylon Sp) Terhadap Daya Serap Air Dan Kekuatan Bending Matheus, Josef; Irawan, Yudy Surya; Soenoko, Rudy
Jurnal Rekayasa Mesin Vol 4, No 3 (2013)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (804.226 KB)

Abstract

Utilization of composite materials at this moment is growing, along with increasing use of these materials in widespread ranging from a simple household appliances to the industrial sector. The purpose of this study is to determine the mechanical properties and water absorption of continuous fiber composites sago pith waste, on a percentage variation in respectivevolume fraction 10%, 30%, and 50%. The fiber is treated by immersion treatment with 5% NaOH alkaline 2 hours and 2% solution of silane for 30, 60, and 90 minutes. Mechanical properties of the composite test results that at 47.37 MPa tensile strength and bending strength of 72.27 MPa with a percentage of the volume fraction (50%), under fiber soaking time (30 minutes) are in the same value. The smaller the value of water uptake, it is contained in immersion treatment of sago pith waste continuous fibers with a percentage of 50% and the volume fraction of fiber soaking time 90 minutes.Keywords: Composites, mechanical properties, water absorption, sago pith waste, volume fraction
Perancangan Simulasi Sistem Pergerakan Menggunakan Metode Register Shiff Pada Pengontrolan Pneumatik Untuk Mesin Pengupas Kelapa Otomatis Jeffrie J Malakauseya; Josef Matheus
Journal Mechanical Engineering Vol. 1 No. 2 (2023): AGUSTUS
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v1i2.1982

Abstract

In the field of industry, one of the most important things in a company is the means of production because one of the production processes will not function and it is impossible for the company's goals to be achieved. Production-based industries definitely need tools and machines to support the production process, one of which is a coconut peeler using a pneumatic system. The problem that occurs is how to analyze the movement of air moving on each pneumatic valve to the cylinder that will move the pressure lever. The performance of a pneumatic-based coconut peeler as a medium for testing the simulation was carried out using the register shift method and simulated in the Pneumatic FluidSim Software. The test was carried out directly on the training board in the pneumatic-hydraulic laboratory. The results show that the air flow acts on each pneumatic valve to move the double acting cylinder which functions as a sander block drive. The next step is to determine the type of cylinder with the diameter size used so that it can move the sanding block to move linearly (back and forth). For this reason, it is necessary to calculate the forces (F) acting on the sanding block and how much air pressure (P) is needed Keywords : Software simulasi, FluidSim-Pneumatik, cylinder
Pengaruh Variasi Arus Pengelasan Gas Metal Arc Welding (GWAM) Terhadap Sifat Mekanis Pada Sifat Seamless Gracia Irene Huka; Leslie. S. Loppies; Josef Matheus; Auliana Diah Wilujeng; Abdul Hamid
Journal Mechanical Engineering Vol. 1 No. 3 (2023): Desember
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v1i3.2116

Abstract

GMAW welding is a metal joining process with a melting process with the addition of a coil of wire in the form of electrodes and protective gas. Seamlees pipe, also known as seamless pipe, is an iron pipe without a connection. This study aims to produce data from the results of bending and impact testing on seamlees pipes by varying the welding current with a current of 21.5 volts, 22.5 volts, and 23.5 volts in GMAW welding. After the seamless pipe is welded, impact and bending tests are carried out on the seamlees pipe. From the bending/bending strength test, the highest flexural strength occurred at a current of 21.5 and 22.5 volts, while the lowest flexural strength occurred at a current of 23.5 volts. From the impact test, the highest strength occurred at 21.5 and 22.5 volts and the lowest was at 23.5 volts.  Keywords: Seamlees pipe, GMAW welder, Bending Strength, Impact Strength.  
ANALISA PENGARUH VARIASI KUAT ARUS PENGELASAN FLUX CORED ARC WELDING (FCAW) TERHADAP SIFAT KEKERASAN PADA DAERAH HAZ BAJA KARBON RENDAH Graciadiana. I. Huka; Josef Matheus; Nevada JM. Nanulaitta; Erwin Bravor Pattikayhatu
Journal Mechanical Engineering Vol. 2 No. 1 (2024): April
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i1.2579

Abstract

Welding is a process of joining metals by utilizing electric power as a source of welding heat. Flux-Core Arc Welding (FCAW) is a welding process that uses a heat source from electricity that is converted into a heat source in an electric arc, in this FCAW welding the type of protection used is flux or powder that is in the core of the welding wire (the welding wire is rolled in a roll). This research aims to observe changes in hardness values after welding, both low carbon steel hardness in the HAZ (Heat Affected Zone) area and outside the HAZ (Heat Affected Zone) area. Welding using V-joints with angles of 45° and 60° and varying the voltage strength at 16 volts, 18 volts and 20 volts. Hardness testing using the Rockwell method where the highest hardness value of the HAZ area for 45 is 22.95 HRD at a voltage strength of 20 volts. For V-joints for an angle of 60°, the highest hardness value of the HAZ area is also at a voltage strength of 20 volts with a value of 24.10 HRD. The highest increase in hardness value is at the V-angle 60° joint with a voltage of 20 volts with a hardness value of 21 HRD while the lowest is the V-angle 45° joint with a voltage of 16 volts at 18.67 HRD. Keywords: Hardness Value, HAZ (Heat Affected Zone), FCAW (Flux Cored Arc Welding)
ANALISA PENGARUH VARIASI PUTARAN DAN FEED RATE PADA MESIN FRAIS TERHADAP KEKASARAN PERMUKAAN DAN LAJU KOROSI PADA BAJA KARBON SEDANG Latuconsina, Muhammad Jen; Nanulaitta, Nevada. J. M.; Matheus, Josef
Journal Mechanical Engineering Vol. 2 No. 3 (2024): Desember
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v2i3.2890

Abstract

A milling machine or milling machine is a machine tool used in the manufacturing process to produce components or parts with the desired shape and size. Milling machines have an important role in the oil and gas industry, especially in the manufacture of components used in oil and gas industry equipment such as grooves on shafts and gears used in drilling equipment and oil and gas production are often made of medium carbon steel because of its strength and durability. This study aims to obtain roughness values and corrosion rates on medium carbon steel through the milling process with variations in rotation of 900 rpm and 1100 rpm and feed rates of 42 mm / min and 76 mm / min with dromus cooling media. The results of this study obtained the highest average roughness value at a rotation speed of 900 rpm and a feed rate of 42 mm/minute, which is 6.64 µm (Ra) and 31.1 µm (Rz), while the lowest average roughness value at a rotation speed of 1100 rpm and a feed rate of 42 mm/minute is 6.23 µm (Ra) and 30.8 µm (Rz), for a rotation speed of 1100 rpm and a feed rate of 76 mm/minute is 7.92 µm (Ra) and 37.1 µm (Rz). The higher the rotation speed and the lower the feed rate, the lower the roughness value, and vice versa. The highest corrosion rate is at 900 rpm and 76 mm/minute feed rate, which is 0.02194 (mm/y), while the lowest corrosion rate is at 1100 rpm and 42 mm/minute feed rate, which is 0.01555 (mm/y). The higher the surface roughness, the faster the corrosion rate, and vice versa. Keyword : milling machine, surface roughness, corrosion rate, medium carbon steel
Pengaruh Variasi Persentase Cangkang Kerang (Caco3) Dan Karbon Arang Kayu Nani Pada Proses Karburasi Terhadap Sifat Mekanis Serta Laju Korosi Baja Karbon Sedang Huka, Graciadiana I; Matheus, Josef; Lekatompessy, R.R.; Nanulaitta, Nevada J.M
Journal Mechanical Engineering Vol. 3 No. 1 (2025): APRIL
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v3i1.3348

Abstract

The effect of additives such as seashells (containing CaCO₃) and nani wood charcoal on the mechanical properties of steel during the carburizing process is significant. The addition of CaCO₃ acts as a catalyst, accelerating carbon diffusion into the steel's microstructure, thereby increasing surface hardness and flexural strength. The results showed that increasing the percentage of CaCO₃ up to a certain point can increase the hardness and strength of the steel, with the highest hardness value achieved at a variation of 50% CaCO₃ and 50% nani wood charcoal, at approximately 21.93 HRC. Hardness testing showed that the variation of additives directly affected the final hardness, with the highest value being achieved at the optimal combination of CaCO₃ and nani wood charcoal. In addition to hardness, other mechanical properties, such as bending strength, also showed an increasing trend with increasing CaCO₃ proportions up to the optimal point, namely at a variation of 70% CaCO₃ and 30% nani wood charcoal, which resulted in a bending stress of 32.64 MPa and a bending strength of 3336.14 MPa. Therefore, the adjustment of the proportion of additives is a key factor in optimizing the mechanical properties of steel through the carburizing process enriched with these natural materials. Keywords: seashells, nani wood charcoal, catalyst, a bending strength
Co-Authors Auliana Diah Wilujeng Erwin Bravor Pattikayhatu Graciadiana. I. Huka Huka, Graciadiana I Ida Ayu Putu Sri Widnyani Jeffrie J Malakauseya Latuconsina, Muhammad Jen Lekatompessy, R.R. Leslie S Loppies Nevada M.J. Nanulaitta Rudy Soenoko Yudy Surya Irawan