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Jurnal Polimesin
Published by Politeknik Negeri Lhokseumawe
ISSN : 16935462     EISSN : 25491199     DOI : http://dx.doi.org/10.30811/jpl
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering
Polimesin mostly publishes studies in the core areas of mechanical engineering, such as energy conversion, machine and mechanism design, and manufacturing technology. As science and technology develop rapidly in combination with other disciplines such as electrical, Polimesin also adapts to new facts by accepting manuscripts in mechatronics. In Biomechanics, Mechanical study in musculoskeletal and bio-tissue has been widely recognized to help better life quality for disabled people and physical rehabilitation work. Such a wide range of Polimesin could be published, but it still has criteria to apply mechanical systems and principles. Exceeding the limitation has been a common reason for rejection by those outside the scope. Using chemical principles more than mechanical ones in material engineering has been a common reason for rejection after submission. Excessive exploration of the management within the discipline of Industrial Engineering in the manufacturing technology scope is also unacceptable. The sub-scope biomechanics that focuses on ergonomics and does not study movement involving applied force on the bio-tissue is also not suitable for submission.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 634 Documents
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Effect of stirring duration on the mechanical properties and fracture morphology of Al-Si-Cu/Al₂O₃ composites Imam Rudi Sugara; Salahudin Junus; Rahma Rei Sakura; Faizah Ali; Dwi Wahyu Hardiyanto; Elvira Ayu Arum Fanani; Haidzar Nurdiansyah; Randy Achmad Iqbal Budiadi
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.9317

Abstract

Aluminum matrix composites often suffer from low mechanical performance due to poor reinforcement distribution and manufacturing defects during the stir casting process. This study aims to evaluate the effect of stirring duration on the mechanical properties, microstructural distribution, and fracture behaviour of Al-Si-Cu matrix composites reinforced with Al2O3 particles. Composites were fabricated using varying mechanical stirring durations of 5, 10, 15, and 20 minutes, with three replicates evaluated for each experimental condition (n=3). Material performance evaluation was conducted through Ultimate Tensile Strength (UTS), elongation at break, and Brinell hardness (HBW) testing, accompanied by Scanning Electron Microscopy (SEM) for microstructural and fracture morphology analysis. The results indicate that mechanical properties followed a parabolic trend with increasing stirring duration. A 10-minute stirring duration was optimal, achieving peak UTS (163.33 MPa), maximum elongation, and highest hardness (87.32 HBW). Microstructural SEM observation revealed uniform Al2O3 particle dispersion and solid interfacial bonding at 10-minute, yielding a ductile fracture with fine dimples. Conversely, prolonged stirring for 20 minutes significantly reduced UTS to 56.78 MPa and deteriorated elongation, suspected to be due to gas entrapment porosity and particle pull-out voids, which triggered a cleavage-dominated brittle fracture mode. In conclusion, controlling stirring duration is critical to optimizing microstructural homogeneity, enhancing ductility, and preventing premature failure in cast composites.
Design and performance evaluation of a crankshaft-driven piston wavemaker for laboratory-scale wave tanks Deny Murdianto; Muhammad Fazrin; Marhadi Budi Waluyo; Sudirman Sudirman; Hadi Santoso
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.9033

Abstract

Laboratory-scale wave tanks are widely used to investigate surface wave behavior using different types of wavemakers, including flap and piston configurations. Previous studies by the authors showed that a simple transmission mechanism for a piston wavemaker produced unstable piston motion, resulting in variations in wave height and wavelength. This study designed and experimentally evaluated a crankshaft transmission system to drive a piston-type wavemaker and obtain more controlled piston motion. The experimental evaluation included mechanical performance analysis in terms of generated force and torque and measurement of wave characteristics at different distances from the wave source. The crankshaft system generated a force of 12.11 N and a torque of 0.24 Nm. The generated waves had average heights of 0.033, 0.029, and 0.027 m at distances of 0.5, 0.7, and 0.9 m, respectively, while the average wavelengths were 0.346, 0.350, and 0.334 m. The decrease in wave height with distance indicates wave energy attenuation during propagation. Compared with the previous piston wavemaker using a simple transmission system, the crankshaft system increased average wave height by 63.02% and average wavelength by 104.34%. The results indicate that the crankshaft transmission provides a more consistent piston motion and wave generation for laboratory-scale wave tank applications.
Full-factorial optimization and continuous prediction of bamboo fiber tensile strength under chemical-thermal conditions Martijanti Martijanti; Arief Nur Pratomo; Ilhamul Akbar Priyono; Muhammad Daffa Nayaka
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.8316

Abstract

The increasing demand for environmentally friendly materials has intensified research on natural fiber composites. Bamboo fiber is a promising reinforcement material because of its high tensile strength, low density, and abundant availability. However, optimizing processing parameters and developing reliable predictive models for bamboo fiber tensile strength remain challenging. Therefore, this study aims to identify optimal processing parameters and develop a continuous predictive model for bamboo fiber tensile strength. A full-factorial design of experiments was employed using four variables: bamboo type, NaOH concentration, immersion time, and immersion temperature. Experimental data were analyzed using the Signal-to-Noise ratio, Analysis of Variance, and General Linear Model to evaluate factor significance and contribution. The results showed that bamboo type and immersion time were the most influential factors affecting tensile strength. The optimum configuration was obtained using rope bamboo treated with 4% NaOH for 2 h at 25 °C. A continuous predictive equation was developed using least-squares regression and showed a statistically significant moderate-to-strong correlation with the experimental run means (r = 0.715, p 0.01). The proposed equation is applicable for interpolation within the tested parameter ranges. The study provides a full-factorial predictive framework for bamboo fiber processing, although independent validation is required before broader application.
Uncertainty quantification in engineering and energy instrumentation: Linking bibliometric insights and practical methods Nanang Apriandi; Sumantri Hatmoko; Berkah Fajar Tamtomo Kiono; Mukhsinun Hadi Kusuma; Khoiri Rozi; Yoyok Setiyo Pambudi; Lily Maysari Angraini; Rani Raharjanti; Muhammad Yunus; Anhar Riza Antariksawan; Sofia Loren Butarbutar; Aris Fiatno; Afifa Pramesywari
Jurnal Polimesin Vol 24, No 4 (2026): August
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i4.7746

Abstract

Reliable quantification of measurement uncertainty is essential for validating thermal performance in engineering systems, particularly in heat pipe experimentation where derived parameters such as heat input and thermal resistance are highly sensitive to instrument variability. Despite the availability of the Guide to the Expression of Uncertainty in Measurement (GUM), practical implementation in laboratory-scale settings remains uneven. This study integrates bibliometric mapping and experimental validation to bridge this gap. A bibliometric analysis of 183 Scopus-indexed publications (1987–2025) identifies dominant research themes centered on high-precision calibration, simulation-based propagation, and intelligent modeling, with comparatively limited emphasis on structured frameworks for resource-constrained laboratories. An experimental uncertainty evaluation was then conducted on five instruments commonly used in heat pipe systems: thermocouples, pressure transducers, a voltage regulator, a digital clamp meter, and a rotameter. Instrument-level accuracy and precision were quantified, and system-level uncertainty was propagated using a GUM-aligned Root-Sum-of-Squares (RSS) method. The system achieved a combined uncertainty of ±2.51 and an expanded uncertainty of ±5.02 at a 95% confidence level. Uncertainty decomposition indicates that electrical input variability, particularly voltage regulation, is the dominant contributor to propagated thermal performance uncertainty. The findings establish a technically grounded and implementable uncertainty framework for laboratory-scale thermal systems, providing quantitative guidance for prioritizing instrumentation improvements and strengthening experimental reliability under constrained resource conditions.

Page 64 of 64 | Total Record : 634

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