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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 Ukuran Partikel Serbuk Cangkang Kerang Perna Viridis terhadap Kekuatan Tarik dan Impak Komposit Resin Epoksi M. Fatih Priyanto; Muhammad Budi Haryono; Muhammad Faesal Febriandyono
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.v5i2.470

Abstract

As a maritime country, Indonesia generates substantial amounts of shell waste that remain underutilized. This study aimed to utilize Perna viridis shell waste as a filler in epoxy resin composites and investigate the effect of particle size on their physical and mechanical properties. We used a quantitative experimental approach, fabricating specimens using the mold casting method. The composite contained 35% filler by mass. Tensile testing followed ASTM D638 Type I, and impact testing followed ISO 179 using the Charpy method. We also performed porosity testing and macrographic observations to evaluate the material structure. The results showed that increasing the mesh size from 80 to 120 reduced porosity from 18.61% to 13.37% and increased tensile strength from 28.77 to 33.04 N/mm². In contrast, impact toughness decreased from 0.051 to 0.047 J/mm². Finer particles improved composite density and interfacial bonding, resulting in higher tensile strength but greater brittleness under impact loading.
Studi Eksperimental Variasi Waktu Degassing dalam Pembuatan Komposit Epoxy Berpenguat Serbuk Cangkang Kerang Amusium pleuronectes Terhadap Sifat Mekanik Komposit Andre Qomaruuddin Arianto; Muhammad Budi; Muhammad Faesal Febriandyono
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.v5i2.471

Abstract

Amusium pleuronectes is a bivalve species commonly found in Indonesia and has potential as a source of filler material for composite applications. This study investigated the effect of degassing time on the physical and mechanical properties of epoxy resin composites filled with Amusium pleuronectes shell powder. Shell powder with a mesh size of 100 was incorporated at 35% of the total mixture volume, consisting of epoxy resin, hardener, and filler. Degassing was performed using a sonicator for 5, 10, and 15 minutes. The composites were characterized through porosity, macrographic, tensile, and impact tests, with three specimens prepared for each variation. The results showed that 10 minutes of degassing produced the highest tensile strength (29.63 N/mm²) and impact toughness (0.051 J/mm²). In contrast, the highest yield strength and Young’s modulus were obtained at 5 minutes of degassing. These findings indicate that 10 minutes of degassing provides the best balance between tensile strength and impact toughness, demonstrating the potential of shell waste as a filler for epoxy-based composite materials.
Analisa Pengaruh Variasi Waktu Perendaman Serat Rumput Gajah (Pennisetum purpureum) Dalam Larutan Kalium Hidroksida (KOH) Terhadap Kuat Tarik Dimas Ahmad Dimas; Sutrisno Sutrisno; Wahidin Nuriana; Muhammad Hasan Basri
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.v5i2.476

Abstract

The use of natural fibers as alternative materials continues to attract attention because they are environmentally friendly, economical, and readily available. Elephant grass (Pennisetum purpureum) is one natural fiber with potential for such applications. This study investigated the effect of different immersion times in potassium hydroxide (KOH) solution on the tensile properties of single elephant grass fibers. We used an experimental method with 10% KOH alkaline treatment and immersion times of 0, 2, 4, 6, and 8 hours. Tensile testing was conducted using a Universal Testing Machine (UTM) to determine tensile stress, strain, and elastic modulus. The results showed that immersion time affected the mechanical properties of the fibers. The highest tensile stress, strain, and elastic modulus were obtained after 8 hours of immersion, reaching 8868.11 MPa, 14%, and 63523 MPa, respectively the alkaline treatment removed impurities from the fiber surface, improving its ability to withstand tensile loading. Therefore, 8 hours of immersion in 10% KOH provided the optimum result and demonstrated the potential of elephant grass fiber as reinforcement for environmentally friendly composites.
Analisis Karakteristik Aerodinamika Ferrari F2004 pada Variasi Kecepatan Aliran Udara Menggunakan Computational Fluid Dynamics Eka Muhammad Dzikra; Yusep Sukrawan; Tatang Permana; Muhamad Maris Al Gifari; 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.v5i2.477

Abstract

This study analyzes the aerodynamic characteristics of the Ferrari F2004 at different airflow speeds using Computational Fluid Dynamics (CFD). Autodesk CFD simulations were conducted at 150 km/h and 350 km/h to analyze pressure distribution, velocity, streamlines, drag, downforce, and aerodynamic coefficients. The results show that increasing airflow speed intensifies pressure and velocity variations and wake formation. Drag increased from 422.012 N to 2,295.60 N, while downforce increased from 151.026 N to 818.567 N. Meanwhile, the drag coefficient remained relatively stable, from 0.3053 to 0.3050, and the lift coefficient changed from −0.1093 to −0.1088. Increasing airflow speed primarily increases the aerodynamic loads on the vehicle.
Analisis Perbandingan Modifikasi Air Cap Spray Gun F3 terhadap Lebar Pola Semprotan dan Kualitas Permukaan Hasil Pengecatan Otomotif Nandang Raihan; 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.v5i2.481

Abstract

This study compared spray pattern width and painted surface quality between an original F3 spray gun and a modified F3 spray gun at narrow, medium, and wide settings. We used a quantitative experimental method with a posttest-only control group design. We tested each spray gun and pattern-setting combination in three independent replications, resulting in 18 specimens. Spray pattern width was measured at a distance of 15 cm with the air cap in a horizontal position, while surface quality was assessed by two observers using an ordinal 1–5 scale. Inter-rater reliability was analyzed using weighted Cohen’s Kappa. The modified F3 produced average pattern widths of 100.00 mm, 161.67 mm, and 199.00 mm, compared with 91.67 mm, 156.67 mm, and 189.33 mm for the original F3. The increases were 9.09%, 3.19%, and 5.11%, respectively. The modified F3 also received higher surface-quality scores. Kappa values of 0.57, 0.50, and 0.33 indicated moderate to fair agreement.
Analisis Pengaruh Bentuk dan Diameter Comb terhadap Karakteristik Aliran Miniatur Wind Tunnel Menggunakan Computational Fluid Dynamics Fajrin Gimnastiar; Yusep Sukrawan; Tatang Permana; Muhamad Maris Al Gifari; 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.v5i2.482

Abstract

This study aimed to determine the comb configuration that provides the most uniform flow distribution with low turbulence and pressure loss. Four comb configurations, namely circular, square, 3 mm-diameter hexagonal, and 6 mm-diameter hexagonal configurations, were analyzed using Autodesk Computational Fluid Dynamics under steady-state conditions with an inlet velocity of 30 m/s. We evaluated flow characteristics based on mean velocity, velocity standard deviation, coefficient of variation, uniformity index, turbulence intensity, and pressure drop. With a test-section hydraulic diameter of 89 mm, the Reynolds number of the main flow was calculated as 1.81 × 10⁵. The results showed that the 6 mm-diameter hexagonal comb performed best, with a mean velocity of 29.982 m/s, a velocity standard deviation of 0.517 m/s, a coefficient of variation of 1.725%, a uniformity index of 99.281%, a turbulence intensity of 0.608%, and a pressure drop of 0.592 kPa. This configuration produced the most uniform velocity distribution, low velocity fluctuation and turbulence intensity, and low pressure loss. Therefore, the 6 mm-diameter hexagonal comb was selected as the best configuration.
Karakteristik Heatsink Berlapis Tembaga dengan Proses Elektroplating dari Model Hasil Pencetakan 3D Berbahan PLA Kelvin Ferdinand. T; Harto Tanujaya; Muhammad Sobron Yamin Lubis
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.v5i2.485

Abstract

This study aimed to analyze the characteristics and thermal efficiency of a three-dimensional printed Polylactic Acid (PLA) heatsink coated with copper through electroplating at different electrical currents. The heatsink was designed in CAD software, fabricated using Fused Deposition Modeling (FDM), and coated with graphite before electroplating. The electroplating process was conducted at an electrode distance of 6 cm using currents of 0.75, 1.00, and 2.00 A with a constant processing time. We compared the thermal performance of the fabricated heatsinks with that of a commercial aluminum heatsink. The results showed that the applied current affected both coating characteristics and thermal performance. The most uniform coating was obtained at 1.00 A, while 2.00 A produced a thicker but less uniform coating. The aluminum heatsink exhibited an actual efficiency of 48%, whereas the copper-plated PLA heatsink at 0.75 A achieved the highest actual efficiency of 86%, with a theoretical efficiency of approximately 91%. These results indicate that copper electroplating can improve the thermal performance of PLA heatsinks.
Karakterisasi Komposit Polimer Berpenguat Serat Tebu Steven Winata; 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.v5i2.486

Abstract

Using sugarcane fiber waste as composite reinforcement can reduce reliance on synthetic fibers, but performance depends strongly on fiber wetting, interfacial bonding, and matrix fraction. This study characterized sugarcane fiber-epoxy composites to determine the effects of three compositions on impact toughness and flexural strength. The fibers were treated with 5% NaOH for 4 h, oven-dried at 50°C for 12 h, aligned at 0°, and fabricated by hand lay-up using fiber-to-epoxy ratios of 50:50, 45:55, and 40:60. Each variation was tested in triplicate according to ASTM D6110 and ASTM D790. Data are reported as mean ± standard deviation and were explored using one-way ANOVA. The 40:60 composition produced the highest impact toughness (0.208 ± 0.003 J/mm²) and flexural strength (17.24 ± 0.75 MPa). Composition significantly affected impact (p = 0.0075) and flexural performance (p = 0.0005. The results indicate that a higher epoxy fraction improves fiber wetting and matrix continuity; however, interface optimization and void reduction are still required before the material can be used for highly loaded structural components.
Analisis Nozzle dan Diffuser terhadap Distribusi Aliran pada Open Circuit Wind Tunnel menggunakan Simulasi Computational Fluid Dynamic (CFD) Sahrul Barokah; Yusep Sukrawan; Tatang Permana; Muhamad Maris Al Gifari; 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.v5i2.487

Abstract

This study analyzes the effect of the nozzle and diffuser on airflow distribution in an open-circuit wind tunnel using Computational Fluid Dynamics simulation. The model was created in Autodesk Inventor and simulated in Autodesk CFD at an airflow velocity of 6 m/s, under steady-state conditions, using the k-ε turbulence model. The simulation stages included model development, meshing, boundary condition setup, and post-processing. The simulation results show that the maximum velocity at the nozzle reached 5.3 m/s, increased to 21,08 m/s at the test section, then decreased to 19,17 m/s at the diffuser, with static pressure gradually increasing from 101.150 Pa at the nozzle to 101.297 Pa at the diffuser, indicating a pressure recovery process consistent with the diffuser function. This study's novelty lies in the stepwise quantitative analysis of velocity and pressure distributions at each segment of a laboratory-scale open-circuit wind tunnel using Autodesk CFD simulation, supported by a mesh-independence test, which has not been widely reported in similar previous studies.
Pengujian Karakteristik Heat Sink 3D Print FDM Dengan Teknik Manufakturing Elektroplating Tembaga Lapis Nikel Nabil Aditya; Harto Tanujaya; Muhammad Sobron Yamin Lubis
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.v5i2.489

Abstract

A heat sink is an electronic cooling component desained to maintain stable operating temperatures and minimize component damage caused by electrical stress. A key challenge lies in manufacturing heat sinks with complex geometries and high-quality base materials without compromising cost or production time. 3D printing is an emerging technology that enables the rapid, detailed, and convenient fabrication of products. Using the FDM 3D printing method, complex heat sink desains can be produced cost-effectively; furthermore, electroplating with copper and nickel can be applied to the printed parts to enhance thermal performance. Testing over a 16-minute period demonstrated that the heat sink performs comparably to conventional models, reaching a maximum temperature of 37.48°C.

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