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Politeknik Negeri Semarang, Indonesia
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INDONESIA
Jurnal Rekayasa Mesin
Published by Politeknik Negeri Semarang
ISSN : 14116863     EISSN : 25407678     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Rekayasa Mesin(d/h MANDEGANI) diterbitkan sejak 1997, dengan frekuensi 3 kali setahun. Misi : media komunikasi bagi dosen, praktisi, dan ilmuwan tentang karya ilmiah (scientific article) hasil-hasil penelitian, survei, studi kasus dan telaah pustaka yang erat hubungannya dengan teknik mesin, meliputi topik/tema seperti perancangan mesin, instalasi, perawatan & perbaikan mesin, bahan konstruksi & komponen mesin, teknik pengerjaan logam, pembuatan komponen mesi n, pengujian bahan dan komponen mesin, teknik pengukuran & kontrol kualitas proses/produk industri manufaktur, manajemen & teknik produksi industri manufaktur, pembentukan dan pengembangan desain produk, aplikasi komputer dalam sistem kendali & operasi mesin, mesin-mesin kalor & fluida, sistem pembangkitan energi, mesin pendingin & pengkondisian udara, pembangkitan energi alternatif & terbarukan.
Arjuna Subject : -
Articles 505 Documents
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Engineering the Impact Toughness and Morphological Integrity of Ramie Fiber Reinforced Rosin Composites via Plasticizer Optimization Muhammad Faesal Febriandyono; Muhammad Budi Haryono; Aan Burhanudin; Agus Mukhtar; Althesa Androva; Wardatul Jannah; Muhamad Safi’i; Hisyam Ma’mun; Riyan Hasta Pratama
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

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Abstract

Driven by rapid technological advancements, material trends have increasingly shifted toward Natural Composites (NACO), primarily owing to their renewability and recyclability. Nevertheless, the utilization of natural resins such as rosin (gondorukem) as a matrix frequently yields brittle characteristics, necessitating the incorporation of plasticizers to enhance their mechanical properties. Despite this, the specific influence of varying plasticizer concentrations on the physical stability, underlying fracture mechanisms, and macro and microstructural properties of rosin ramie composites remains largely unexplored. This study aims to engineer and evaluate the effect of plasticizer concentration (15% and 30%) on the impact toughness, absorbed energy, and structural characteristics of rosin matrix ramie fiber composites. An experimental approach was employed using ASTM D256 standard for impact testing, coupled with macro and microstructural morphological analyses. The findings indicate that the maximum average impact toughness reached 0.0735 J/mm² at a 30% plasticizer concentration. Interestingly, the maximum single absorbed energy of 9.880 J was observed at 15% concentration, yielding a specific impact value of 0.0689 J/mm². This discrepancy occurs because the 30% plasticizer provides a more uniform plastic deformation capability across samples, whereas the 15% concentration exhibits localized rigid resistance before catastrophic failure. Morphological analyses revealed fracture mechanisms including fiber pull out, matrix cracking, and oxidation, which correlate directly with the mechanical performance.  Altering the plasticizer concentration significantly influences the polymer chain mobility and interfacial bonding of the composites. The 30% concentration optimally prevents micro crack propagation, offering significant practical value for developing sustainable, impact resistant green engineering materials.
Design, Finite Element Analysis, and Experimental Validation of a Jig Holder for SinglecDisc Metallographic Polishing Machines Ahmad lubi; Niko Ade Saputra; Ferry Budhi Susetyo; Danar Hari Krisyono; Ichsan Arfan Timur; Reza Febriano Armas; Muhammad Fatihuddin
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

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Abstract

Specimen stability during metallographic polishing is critical to obtaining accurate microstructural observations, yet inconsistent pressure in single disc polishing machines often causes non-uniform surface finish and unreliable results. While previous studies have extensively addressed polishing parameters and machine performance, limited attention has been given to auxiliary fixtures that actively maintain specimen stability and pressure consistency, a gap this study addresses. This paper proposes a novel jig holder design that integrates finite element-based structural verification with experimental validation, offering a more consistent alternative to conventional manual polishing. The design methodology comprised requirement analysis, three-dimensional CAD modeling, structural simulation via finite element analysis (FEA) to evaluate von Mises stress, displacement, and factor of safety (FOS), followed by fabrication and experimental testing on Aluminum 6061 specimens under polishing loads of 50 g and 150 g, with manual polishing as a baseline. FEA results confirmed the structural safety of the jig holder, with a maximum von Mises stress of 0.103 MPa and a minimum factor of safety of 10. Experimentally, the jig holder consistently produced lower and more uniform surface roughness (0.220–0.225 μm) than manual polishing (0.235 μm), indicating that consistent, controlled pressure distribution rather than operator dependent manual force is the primary mechanism improving surface quality. These findings demonstrate that the proposed jig holder offers a practical, low cost solution for improving specimen preparation reliability in metallographic laboratories, with potential application in quality sensitive materials characterization workflows.
Catalyst-Dependent Performance and Emission Trade-Offs in a Passive Hydrocarbon Cracking System for Gasoline Engines Aji Bagus Ardiyanto; Sena Mahendra; Bayu Ariwibowo; Fahmy Zuhda Bahtiar; Fahmy Fatra
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

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Abstract

Improving combustion efficiency and reducing exhaust emissions remain significant challenges for gasoline engines, particularly in developing countries experiencing rapid vehicle growth. This study investigated the effect of passive Hydrocarbon Cracking Systems (HCS) using various catalyst materials (steel, activated carbon, natural zeolite, and nickelin) on engine performance and exhaust emission characteristics without engine modification. Experiments were conducted on a 110cc single-cylinder, fuel-injected gasoline engine using commercially available RON 92 fuel. Engine performance was evaluated using a dynamometer to measure torque and power, while exhaust emissions (CO, HC, and CO₂) were analyzed using a calibrated gas analyzer at various engine speeds. The results indicate a clear trade-off between performance improvement and emission control depending on the catalyst material used in the HCS. . The zeolite-based catalyst provided the most significant performance improvements, increasing maximum torque by 5.61% and maximum power by 1.91%, while reducing HC by 9.48%, CO by 10%, and increase CO2 by 1.4% . In contrast, the nickelin catalyst demonstrated superior emission control, achieving a 24.57% reduction in HC, 10.1% in CO and increase CO2  4.17%, although the associated power gains were lower than those obtained with zeolite. However, most of the studies that have been conducted only focus solely on the effects on performance and exhaust emissions, without providing insight into the catalyst materials used for fuel cracking. To address this gap, this study aims to empirically provide insight into which media are best used as catalysts in HCS systems.
Comparative Failure Analysis of A356 and ADC12 Aluminium Alloy Clutch Brackets for Automotive Transmission Applications Ibnu Mukti Purba; Suherman; Mochamad Arif Irfa’i
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

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Abstract

The bracket and clutch cable serve as a mechanical link between the clutch pedal inside the cabin and the release fork in the transmission. Failure of this component can disrupt gear-shifting performance and reduce vehicle reliability. Although aluminium alloy brackets are widely used in automotive applications for their lightweight properties, information on the failure behaviour of transmission brackets in city cars remains limited. Therefore, this study aimed to investigate the mechanical properties, microstructural characteristics, and fracture behaviour of aluminium alloy transmission brackets from two different aluminium alloys. The research used metallographic examination, and fractographic analysis with Scanning Electron Microscopy (SEM) and hardness testing. Specimens were sectioned transversely from the bracket component, prepared using standard metallographic procedures, and examined to identify microstructural features and fracture mechanisms. The results showed that both brackets exhibited a relatively homogeneous Al–Si alloy microstructure with rounded grains and spherical porosity, indicating that they were manufactured by high-pressure die casting. The ADC12 aluminium alloys had a higher average hardness of 91.5 HV than A356, which had 78.8 HV. Fractographic observations revealed that the A356 bracket was dominated by ductile fracture characterized by microvoid coalescence, whereas the ADC12 bracket exhibited mixed brittle–ductile fracture features associated with silicon-rich and intermetallic phases. In both samples, casting porosity acted as a stress concentrator and potential crack initiation site. These findings indicate that variations in casting quality and microstructural characteristics significantly influence the hardness and fracture behaviour of aluminium alloy transmission brackets. The study provides useful insights for improving material selection, casting quality control, and the reliability of automotive transmission linkage components.
Numerical Analysis of Oblique Collision on Ship Bow Structure Using the Finite Element Method Juan Abiegnail Sianipar; Aldias Bahatmaka; Song Yeon Hee; Haris Nubli
Jurnal Rekayasa Mesin Vol. 21 No. 2 (2026): Volume 21, Nomor 2, Agustus 2026
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

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Abstract

Oblique bow collision is a complex maritime accident scenario, as the angled impact produces a non-uniform distribution of force and deformation, making the resulting damage substantially harder to predict than perpendicular collisions. Although numerous finite element studies have examined ship collision behavior, most have isolated a single parameter, leaving the combined effect of collision position and angle insufficiently characterized within a single validated numerical approach. This study addresses that gap by evaluating, for the first time within one validated numerical approach, the combined influence of collision position and angle on the structural response of a ferry-to-LPG carrier collision, using Explicit Dynamic Finite Element Method analysis in ANSYS Workbench 2024 R2 (LS-DYNA solver), with two collision positions (P1: main deck; P2: mid-body/bulbous bow) and three angles (90°, 120°, 135°) at 5 m/s across six scenarios, validated against experimental data with a crushing force error of 1.07%. Results show collision position more decisively affects structural resistance than angle, with P2 producing a peak force of 31.44 MN at 90°, over 60% higher than P1. Peak force and internal energy absorption were also found decoupled, with the highest energy absorbed at P2-120° (9.85 MJ) rather than the highest-force case, indicating that the P2-90° zone is structurally critical and warrants priority reinforcement, such as additional transverse framing or localized plate thickening. These findings support treating energy absorption as equally critical to peak force in ship collision safety assessment, in line with Sustainable Development Goal 9 (Industry, Innovation and Infrastructure), and future work is recommended to develop this numerical approach further through variations in collision velocity and distance.

Page 51 of 51 | Total Record : 505

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