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Perum Graha Garuda Mas Blok II No. 39 Dusun V Desa Sigara-Gara Kecamatan Patumbak Kabupaten Deli Serdang Provinsi Sumatera Utara, Indonesia, Kode Pos: 20361.
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IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA)
Published by CV. IRA PUBLISHING
ISSN : -     EISSN : 29624290     DOI : https://doi.org/10.56862/irajtma
Core Subject : Science, Engineering,
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) fokus pada artikel ilmiah hasil penelitian dan review dalam bidang teknik mesin dan aplikasinya yang antara lain meliputi: 1. Konversi energi 2. Mekanika 3. Material 4. Manufaktur 5. Lain-lain yang relevan
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 257 Documents
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Pengaruh Variasi Panjang Serat Gambas (Luffa acutangula ) Pada Material Komposit Terhadap Sifat Tarik Bermatriks Polyester Tegar Satrio Purnomo Adji; Sutrisno Sutrisno; Muhammad Hasan Basri; Doni Dwi Susilo
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.491

Abstract

This study aims to analyze the effect of variations in luffa (Luffa acutangula) fiber length on the tensile properties of Polyester resin matrix composites. The composites were made by hand lay-up using a volume fraction of 90% resin and 10% fiber, with fiber lengths of 5 mm, 7 mm, 9 mm, and 11 mm, and tested using a UTM according to ASTM D638. The results showed fluctuating mechanical properties, with the highest tensile strength and maximum stress at 9 mm (0.816 kN and 20.31 MPa) and the lowest at 7 mm (0.681 kN and 17.27 MPa). The highest strain occurred at 9 mm (0.019) and the lowest at 5 mm and 7 mm (0.015), while the highest modulus of elasticity was at 5 mm (1387.610 MPa) and the lowest at 11 mm (970.5158 MPa). Overall, a fiber length of 9 mm is the optimum condition because it produces the best balance between strength and deformation.
Analisa Variasi Impeller dan Putaran Terhadap Debit pada Pompa Submersible dengan Daya 240 Watt Khairul Suhada
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.492

Abstract

Submersible pumps transfer fluids by increasing pressure. This study aimed to analyze how impeller blade shape, blade number, and rotational speed affect the flow rate of a homemade submersible pump prototype. A 12 V, 240 W type 775 DC motor drove the pump. Experimental tests were conducted using two impeller blade configurations, namely straight and curved blades, with a radius of 26 mm and a PVC thickness of 17 mm. The number of blades was varied at 4, 6, and 8, while the motor speed was set at 9000, 10000, and 11000 rpm. We measured flow rate at heads of 1.5, 2, and 2.5 m using a volumetric collection method and a flow meter. The results showed that impeller shape, blade number, and rotational speed affected the flow rate. At a 1.5 m head, the highest flow rate was 474.89 mL/s using Impeller I with 8 blades at 11000 rpm. At a 2.5 m head, the highest flow rate was 172.14 mL/s using Impeller I with 4 blades at 9000 rpm.
Pengaruh Ketebalan Lapisan terhadap Sifat Tarik dan Impak Komposit Laminat Berbasis Serat Bambu dan Resin Poliester Aminur Aminur; Sudarsono Sudarsono; Jaka Seru Dwi Saputra
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.495

Abstract

The need for lightweight, strong, and environmentally friendly engineering materials has driven a massive shift from synthetic fiber composites to natural fiber composites. Natural fibers, such as bamboo, offer a promising alternative due to their abundance, renewability, low density, and high specific tensile strength. This study aims to determine the effect of fiber layer thickness variations (0.5 mm, 1.0 mm, and 1.5 mm), with a constant [±45o]s angle configuration, on the tensile and impact performance of bamboo fiber-polyester resin laminate composites. The sample preparation began by cutting high-quality bamboo to 300 mm in length and 10 mm in width, then planing it to achieve the required thickness variations. The bamboo fibers were then soaked in a 5% NaOH solution for 120 minutes, dried, and arranged into 4 layers with a fiber volume fraction of 30%. The tests conducted included tensile and impact tests to determine the optimum fiber thickness. The results showed that the smallest fiber thickness (0.5 mm) produced the highest mechanical strength, with a tensile strength of 11.201 MPa and an impact strength of 0.0033 Joule/mm². Conversely, increasing the fiber layer thickness decreased both tensile strength and impact strength.
Kajian Literatur: Metode Penguatan UHMWPE dan Pengaruhnya terhadap Kemampuan Serap Energi pada Sistem Pelindung Balistik Haniel Christo Hong Sitorus; Hizkia Ginting; M. Alif Safril Hudya; Anang Setiawan; Rando Tungga Dewa; Judika Landung Butarbutar
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.456

Abstract

Ultra High Molecular Weight Polyethylene (UHMWPE) is a polymer material widely used in ballistic protection systems due to its low density, high specific strength, and excellent energy absorption capability. This article aims to systematically review various UHMWPE reinforcement methods, compare their effectiveness, identify the most promising methods, and evaluate their effects on the mechanical properties and energy absorption performance of the material in ballistic protection applications. The method used is a systematic literature review following the PRISMA framework (Identification, Screening, Eligibility, and Inclusion). Literature was collected from the Scopus, ScienceDirect, Web of Science, and Springer databases in period 30 years. Of the 86 articles initially identified, 42 articles met the inclusion criteria and were analyzed descriptively and comparatively, covering crystallinity modification, gamma irradiation crosslinking, vitamin E stabilization, and the incorporation of reinforcing materials such as graphene, carbon nanotube, aramid, and carbon fiber. The results indicate that increased crystallinity and crosslink formation improve hardness, tensile strength, wear resistance, and structural stability under impact loading. The addition of vitamin E effectively inhibits oxidative degradation and improves fatigue resistance by approximately 30%, while nano-based fillers such as graphene nanoplatelets and carbon nanotubes significantly enhance mechanical strength and energy dissipation capability. Overall, the combination of gamma-irradiation crosslinking with nano-filler reinforcement shows the greatest potential for improving the performance of UHMWPE as a lightweight ballistic protection material with high energy absorption capability.  
Penerapan Lapisan Hard Chromium pada Duplex Stainless Steel SS329 untuk Proteksi Impeller pada Operasi Karbamat Mochamad Noercholin Zachary; Rando Tungga Dewa
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.459

Abstract

Multistage centrifugal pumps operating in carbamate environments are subjected to significant material degradation due to the combined effects of corrosion and abrasive wear. This study investigates the application of hard chromium plating (HCP) on SS329 duplex stainless steel impellers manufactured through a reverse engineering approach at PT Nusantara Turbin dan Propulsi. The electroplating process utilized a CrO₃ solution at a temperature of 42–50°C and a voltage of 5–6 V for 5 days. Coating characterization was performed through metallographic cross-section thickness measurements at 10 points and Vickers hardness testing (HV0.3). The average coating thickness was 20.27 μm with a coefficient of variation of 16.5%, while the average coating hardness reached 1077.1 HV0.3 with a coefficient of variation of 2.8%, exceeding the standard hardness range of 800–1000 HV for hard chromium coatings. The hardness improvement of approximately 3.4–3.8 times compared to the SS329 substrate (280–320 HV) indicates the potential of the coating to improve impeller service life relative to uncoated conditions, although long-term field validation is still required. In addition, the coating is expected to reduce maintenance frequency and operational downtime. The observed thickness variation indicates the need for optimization of current distribution and anode configuration to improve coating uniformity on the complex geometry of the impeller.
Pengaruh Variasi Komposisi Serat Rami terhadap Sifat Mekanik Komposit Berbasis Resin Epoxy untuk Aplikasi Cover ECU Standar Yamaha YZF-155 Muhammad Calvine Ferdinand; Erwin Siahaan; Abrar Riza
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.480

Abstract

This study aims to analyze the effect of variations in the composition of Ramie Fiber (Boehmeria nivea) and Epoxy Resin on the mechanical properties of composites for use as a standard Yamaha YZF-155 ECU Cover. The composites were fabricated using the Hand Lay-Up method with 5% NaOH threatment for 12 Hours. The Ramie Fiber and epoxy resin compositions were 50%:50%, 40%:60%, and 30%:70%. Testing was conducted using the Impact Test according to ASTM D6110 and the bending test according to ASTM D790. The results showed that the highest Impact toughness was 0.364 J/mm2 at a composition of 50%:50 %, while the highest bending strength was 17.77 N/mm2 at a composition of 40%:60 %. Based on these results, Ramie fiber-reinforced epoxy resin composites have the potential to be used as an alternative material for the Yamaha YZF-155 ECU Cover, offering adequate mechanical properties and environmental benefits.  
Pengaruh Optimasi Air Fuel Ratio melalui ECU Juken 5 terhadap Daya dan Torsi Mesin Yamaha Aerox 155 Muhammad Fahrizal Faisol; Yusep Sukrawan; Tatang Permana; Ridwan Adam Muhamad Noor
IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) Vol 5 No 2 (2026): Agustus
Publisher : CV. IRA PUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56862/irajtma.v5i2.484

Abstract

This study aimed to analyze the effect of Air Fuel Ratio (AFR) variations obtained through tuning of a Juken 5 programmable ECU on the performance of a Yamaha Aerox 155 engine. The study used an experimental method with a chassis dynamometer, comparing the initial run condition with the tuned condition at a target AFR of 12.8:1. Testing was conducted under Wide Open Throttle (WOT) conditions using Pertamax RON 92 fuel, with maximum power and torque as the main performance parameters. The results showed that the initial condition with an AFR of 10–11 produced a maximum power of 20.07 HP and torque of 10.33 ft-lbs. After final tuning at an AFR of 12.8, maximum power increased to 22.54 HP at 10,260 rpm, representing a 12.3% increase, while maximum torque increased to 11.59 ft-lbs at 10,200 rpm, representing a 12.2% increase. These results indicate that stabilizing the AFR at 12.8:1 was associated with improved engine performance at high engine speeds. However, the relationship was not statistically tested, so the observed improvements cannot be considered statistically significant.

Page 26 of 26 | Total Record : 257

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