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Journal of Mechanical Engineering Science and Technology
Published by Universitas Negeri Malang
ISSN : 25800817     EISSN : 25802402     DOI : 10.17977
Core Subject : Science, Engineering,
Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
Journal of Mechanical Engineering Science and Technology (JMEST) is a peer reviewed, open access journal that publishes original research articles and review articles in all areas of Mechanical Engineering and Basic Sciences
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 168 Documents
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Boiling Heat Transfer Coefficient and Critical Heat Flux on Conical Cylindrical Copper under Surface Modification Nashrullah, Muhammad Dimyati; Sanata, Andi; Solahuddin, Imam; Ilminnafik, Nasrul; Pranoto, Indro; Widyaparaga, Adhika
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p126

Abstract

This study examined how surface roughness and nanoceramic coating, influences the boiling heat transfer coefficient (BHTC) and critical heat flux (CHF) of a conical cylindrical copper test specimen. Three test specimens exhibiting surface roughness of 0.22 µm, 0.14 µm, and 0.04 µm were analyzed for comparison. Two additional test specimens were treated with nanoceramic coatings utilizing silicon carbide as the base material: one specimen received a single-layer coating and the second was applied with a double-layer coating. The behavior of the bubbles was closely observed with a high-speed camera to deepen the analysis. The experimental results showed that the test specimen with higher surface roughness exhibited higher BHTC and CHF. The 0.22 µm surface roughness specimen demonstrated a 55.69% greater BHTC than the 0.04 µm surface roughness specimen. In contrast, the 0.04 µm surface roughness specimen had the lowest CHF, 426.09 kW/m². Nanoceramic coating also enhanced the BHTC and CHF. The specimen with a single-layer coating had the highest BHTC, 40.81% higher than the uncoated specimen. The specimen with a double-layer coating showed a 60.12% increase in CHF compared to the specimen with a single-layer coating. The bubble observation results indicated that test specimens with higher BHTC and CHF had more active nucleation sites. The quantity of active nucleation sites plays a vital role in producing a large number of bubbles, enhancing heat transfer, and maintaining the surface temperature.
Tear Resistance Evaluation of Room Temperature Vulcanizing Silicone Rubber: A Comparative Study Mawandi, F.R.; Safitri, P.D.; Mirnanda, D.; Nurrokhim, F.H.R.; Adyono, Ndaru; Lestari, Wahyu Dwi
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p190

Abstract

Room Temperature Vulcanizing (RTV) silicone cures at room conditions, providing tear resistance and flexibility to a wide range of industries. Yet, its mechanical performance improvement continues to be difficult when it is filled and catalyzed. In this work, the tear resistance of three RTV materials—RTV 48, RTV 683, and RTV M4503—is investigated with different talc (2–4 wt.%) and catalyst (40–60 wt.%) formulations. Tear resistance testing per ASTM D624 yielded average and standard deviation values for material consistency determinations. Comparative analysis is also given in the research to ascertain the effect of over-cross-linking on elasticity and structural morphology. RTV 48 experienced a dramatic decrease in tear strength at high catalyst content due to over-cross-linking and the loss of elasticity. RTV 683 experienced initial improvement through the addition of talc, but excess catalyst caused premature cure and reinforcement loss. In contrast, RTV M4503 showed significant tear resistance enhancement as talc and catalyst were compounded optimally, maintaining structural integrity and reinforcement efficacy. Results demonstrate the crucial role of filler and curing agent concentration interaction in modulating silicone mechanical properties. RTV M4503 featured the optimal tear resistance and stable performance among the compositions assessed, indicating its potential use in applications requiring enhanced durability. This research provides a guide to optimization of additive ratios in RTV silicone formulations, guiding materials and process conditions selection for industrial applications that demand reproducible mechanical strength.
Influence of Different Nanoparticles on Thermophysical Properties and Wear Resistance of Corn Oil-Based Cutting Fluid in MQL-CNC Milling Machining Habiby, M. Nuril Anwar; Puspitasari, Poppy; Aminnudin, Aminnudin; Pramono, Diki Dwi; Fikri, Ahmad Atif; Ghazali, Mariyam Jameelah
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p075

Abstract

Vegetable oil-based cutting fluids have emerged as a promising innovation in machining operations, supporting the advancement of sustainable and eco-friendly manufacturing practices. This study delves into the development of a biolubricant derived from corn oil, enriched with 0.15% mass fractions of various nanoparticles, including calcium carbonate (CaCO3), copper oxide (CuO), and multi-walled carbon nanotubes (MWCNT). These nano-cutting fluids were applied through the Minimum Quantity Lubrication (MQL) method during CNC milling of AISI 1045 steel. The investigation focused on evaluating thermophysical properties, including density, thermal conductivity, and dynamic viscosity, as well as tool wear performance. The results demonstrated that CuO nanoparticles yielded the highest density, while MWCNT exhibited superior thermal conductivity and viscosity. Among all samples, the fluid with MWCNT showed the most effective performance in minimizing tool wear. This study highlights the potential of nanoparticle-enriched vegetable-based cutting fluids as high-performance, environmentally responsible alternatives to conventional mineral oil-based lubricants, promoting greener machining in the manufacturing industry.
Simulation of Magnet Thickness and Angle of Attack on Magnetic Force for Magnetic Turbine Design Pratama, Eka; Wirawan, Wirawan
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p258

Abstract

Electric motors play a vital role across various industries. As their electricity demand grows, improving efficiency has become a priority. One area of innovation involves the use of magnetic strips for improving performance. This study aims to determine the magnet thickness and the angle of attack position in producing the strongest repulsive force in the magnetic turbine. The study used a simulation using SOLIDWORKS and EMS software, applying neodymium N52 magnets with varying sizes and angles of attack. The results indicate that the most efficient magnetic turbine configuration utilizes rotor and stator magnets with dimensions of Ø10 × 20 mm and an angle of attack of 44°. Magnet thickness influences the magnetic force: Thicker magnets generate stronger repulsive forces due to higher stored magnetic energy, whereas thinner magnets result in weaker forces due to reduced magnetization volume. The simulation of two opposing magnets confirmed that the configuration of Ø10 × 20 mm at a 44° angle of attack produced the highest magnetic flux density of 2.277 × 10⁻¹ Tesla. Furthermore, the 44° angle between rotor and stator yielded a more stable magnetic flux distribution, effectively minimizing cogging torque, that a common cause of undesirable fluctuations in rotor motion. This angle can be recommended for achieving smoother and more efficient turbine operation.
Development of Adjustable Static Test Equipment for Below-Knee Prosthetic Feet: A Case Study Nurrokhim, Firmansyah Hafizh Rizal; Mawandi, Fauzan Raka; Safitri, Puspa Dinda; Mahmudah, Imam; Mirnanda, Dwiky; Adnyono, Ndaru; Lestari, Wahyu Dwi
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p143

Abstract

The high prevalence of physical disabilities in Indonesia, particularly among the productive-age population, highlights the urgent need for advancements in prosthetic technology. While local fabricators have begun producing prosthetic feet, the lack of standardized testing procedures compromises safety and performance. This study addresses that gap by developing an adjustable static testing device tailored for below-knee prosthetic feet, focusing on keel and heel tests to evaluate mechanical performance. The device includes a jig-fixture platform adjustable to 8° and 15° for heel and keel tests, respectively. It applies a 1230 N load based on AOPA standards and integrates load and displacement sensors for accurate data acquisition. Structural components are constructed from AISI 1020 steel, with fabrication involving welding, assembly, and system calibration. The testing procedure adheres to ISO 10328 to ensure reliability under realistic loading conditions. An Ottobock SACH prosthetic foot was used in trials, demonstrating the device’s ability to classify prosthetic feet into dynamic and cushioned types, based on load-bearing and energy-return characteristics. Polynomial regression analysis showed high accuracy in capturing load-displacement behavior, with R² values above 0.85 for both tests. The results offer valuable guidance for local prosthetic fabricators aiming to design testing equipment or apply AOPA and ISO standards for quality assurance. This research supports the development of a standardized testing framework for prosthetic feet in Indonesia, enhancing product safety and quality while promoting alignment with international benchmarks. The outcomes also suggest potential for broader applications in advancing prosthetic technologies and establishing national standards.
Effect of Various Canopy Shapes on the Drag Coefficient of Pickup Trucks Anwar, Khairil; Fadly, Muhammad Syaiful; Hermanto, Muhammad Wahyu
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p203

Abstract

The aerodynamic performance of light commercial vehicles, such as the Suzuki Carry, plays a crucial role in their fuel economy and road stability. One typical add-on, a canopy, often changes that airflow and, as a result, alters the drag acting on the vehicle. In this study, three different canopy shapes, flat, curved, and triangular, were examined to understand how each one affects the drag coefficient (Cd). To investigate this, both wind tunnel trials and CFD runs were conducted to track the airflow and measure any changes in drag with greater detail. For reference, the exact vehicle without a canopy was used as the base for comparison. From what has been observed, it is clear that adding a canopy tends to increase drag compared to leaving the cargo bed open. Of the three shapes tested, the flat canopy proved to be the most effective in increasing Cd, especially at moderate speeds. At around 80 km/h, for example, it pushed drag up by just over 11.063%. On the other hand, the curved canopy yielded the best result, adding only about 2.071% at 60 km/h. Flow images from the CFD runs showed that the flat and triangular designs disrupted the airflow more significantly, resulting in greater flow separation and larger wakes behind the truck. In contrast, the curved canopy seemed to keep the air closer to the surface, leaving less turbulence in its wake.
Impact of Print Speed and Nozzle Temperature on Tensile Strength of 3D Printed ABS for Permanent Magnet Turbine Systems Wirawan, Wirawan; Firmansyah, Hilmi Iman; Adiwidodo, Satworo; Mustapa, Mohammad Sukri
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p090

Abstract

Operational parameters must be integrated into turbine systems' main components, which are determined by turbine systems' functional requirements. The need for producing component designs more effectively raises the possibility of using additive manufacturing. The study focuses on the optimization of the mechanical properties of the principal components of magnetic turbines manufactured with 3D printers using Acrylonitrile Butadiene Styrene (ABS), by changing the temperature and speed of the nozzle. The approach consisted of modeling a standard test piece in CAD software and producing ABS-based test pieces using a 3D printer with print speeds of 50, 70, 90, and 110 mm/s and temperatures of 230, 240, 250, and 260 °C. The tensile properties of the samples were determined according to ASTM D638-14 Type I, and the results reveal a consistently greater tensile strength for the parts with high nozzle temperatures of approximately 250 °C and lower print speeds of 50 and 70 mm/s. At higher speeds of 90 and 110 mm/s, though the nozzle temperature has little effect on tensile strength, suggesting that the effect of other parameters is more significant. Whatever the print speed, at higher nozzle temperature (250℃), average tensile strength was improved. Control of nozzle temperature is paramount in increasing tensile strength in the 3D printing process performed at low speeds. Also, the average tensile strength is consistent and normalized. For all print speed values, a 250℃ nozzle produces consistently higher average tensile strength than a 235℃ nozzle. Analysed the parameters for print speed and nozzle temperature, providing optimal results for stronger and more reliable parts for use in turbines.
Optimizing Aluminium 6061 Turning using Kesambi Oil-Based Cutting Fluid and Response Surface Methodology to Reduce Surface Roughness Wahjudi, Ari; Baihaki, Raihan; Anam, Khairul
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 9, No 1 (2025)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v9i12025p305

Abstract

This study investigates the viability of Kesambi oil (Schleichera oleosa) as an environmentally sustainable, bio-based cutting fluid to reduce surface roughness during the turning of Aluminium 6061. The study employs Response Surface Methodology in conjunction with a Central Composite Design to identify the optimal parameter combination between two primary variables, including the composition of Kesambi oil and the depth of cut during machining. The best configuration, comprising 19.57% Kesambi oil and a cutting depth of 0.99 mm, yielded a surface roughness of 3.61 µm, closely matching the predicted value of 3.59 µm. A Fourier Transform Infrared Spectroscopy was conducted to indicate the presence of a thin lubricating film on the surface. This film can reduce the friction and enhance the high surface quality. Generally, the results show that Kesambi oil is effective and sustainable compared to conventional petroleum-based cutting fluids.

Page 17 of 17 | Total Record : 168

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