cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Lovely Son
Contact Email
lovelyson@eng.unand.ac.id
Phone
+6281213552846
Journal Mail Official
metal@eng.unand.ac.id
Editorial Address
Kampus Limau Manis, Jurusan Teknik Mesin, Fakultas Teknik, Universitas Andalas
Location
Kota padang,
Sumatera barat
INDONESIA
METAL : Jurnal Sistem Mekanik dan Termal
Published by Universitas Andalas
ISSN : 25981137     EISSN : 25974483     DOI : -
Core Subject : Science, Engineering,
Automotive Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
METAL: Jurnal Sistem Mekanik dan Termal translated as METAL: Journal of Systems in Mechanical and Thermal is a scholarly peer-reviewed journal published by Mechanical Engineering Department of Engineering Faculty at Universitas Andalas, Padang, Indonesia. The journal focused on the mechanics and thermal aspects of the mechanical engineering area, and accepted articles are in these subjects: Energy - Renewable energy - Green industry - Energy conversion Mechanical System Engineering - Solid body mechanics - Machine construction - Vibration and control - Mechatronics - Tribology Production System Manufacturing engineering - Product design and development - Production technology - Production logistics and transportation Materials Engineering - Material technology - Nanotechnology
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 143 Documents
 11   12   13   14   15 
Analyzing The Effect of Cylinder Liner Bronze Alloys on Hardness Hasbullah, Ichsan; Pratama, Aditya Wahyu
METAL: Jurnal Sistem Mekanik dan Termal Vol. 8 No. 2 (2024): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.8.2.%p.2024

Abstract

The quality of a component material is a significant issue in today's society, where the concept of "quality for a price" is a prevalent one. This phenomenon is observed across various sectors, including official manufacturers, local factories, and even students. The objective is to consider and implement measures to enhance the quality of components, aiming for a satisfactory value. The influence of the hardness value on the ductile iron alloy with AB2 is a key factor in this study. The aim is to identify the ideal mass percentage quantity to obtain a satisfactory hardness value. This is based on the understanding that the limited quantity of gray cast iron in cast furnaces affects the value of its mixture with AB2. The process from start to finish encompasses a number of stages, during which the incorporation of AB2 into ductile iron results in a change in the quality of the molten metal, which becomes visibly more liquid. In contrast, the impact of the aluminum element is relatively modest, although the final value of the alloy, which is 37% nickel, significantly increases the hardness value. This type of iron is widely used in automotive products. It is recommended that production parties, especially those involved in the manufacture of automotive components, consider the indications that occur in the values of this test. This is because the development of material improvements has been very rapid in recent times. The hardness value achieved by the non-alloy was recorded at 372.92 HVN, the 14% AB2 alloy was 509.94 HVN, the 25% AB2 alloy had a value of 408.79, and the 37% AB2 alloy exhibited a twofold increase from the value without the alloy, namely 679.96 HVN.
Designing CVT Slide Piece Molds for Cavity 24 Pieces on Injection Molding Machine Latief, Alfan Ekajati; S., M. Pramuda Nugraha; S., Adimas Prasetyo; Prianto, Ramdan; Sarmada, Sarmada; Irfan, Laode Mochamad
METAL: Jurnal Sistem Mekanik dan Termal Vol. 8 No. 2 (2024): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.8.2.56-62.2024

Abstract

Composite materials are often used in the industrial world, one of which is in the automotive industry. Material composite based on polypropylene high impact (PPHI) and natural fiber can be used to create slide piece components on the CVT of automatic motor vehicles. In this study, we will design molds from injection molding on an industrial scale en masse, producing a slide piece product made from composite materials. This research is a development of the previous injection molding mold. In the study, the solidworks software will compare three types of multi-cavity, namely circular, series, and parallel, to get more efficient and effective molds. This multi-cavity type is designed to print PPHI material and pineapple fiber with a volume fraction of 20% and a mesh of 170. The mold material designed is made of stainless steel 2316 for cavity and core parts with a size of 180mm x180mm. Using simulation plastic on solidworks, the simulation results obtained a type of circular type that can be applied to injection machine molds because it has the most effective pressure value of 4.8 MPa and its geometric shape. Then obtained a fill time of 1,89s and volumetric shrinkage at the end of fill at a max of 17.56%, which is more efficient.
Adhesion Improvement of Hydroxyapatite Layer on Ti-6Al-4V ELI with the Contribution of PVA and Zirconium Oxide for Biomedical Applications Ardhy, Sanny; Islahuddin, Islahuddin
METAL: Jurnal Sistem Mekanik dan Termal Vol. 8 No. 2 (2024): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.8.2.49-55.2024

Abstract

Ti-6Al-4V Extra Low Interstitial (ELI) is one of the most widely used titanium alloys for orthopedic implants. However, its drawback is that titanium has less bioactive properties. Therefore, Ti-6Al-4V ELI needs to be coated with hydroxyapatite (HA) to achieve good osseointegration in the human body. Nevertheless, several studies have shown that there are still cracks found on the HA surface layer. This research aims to focus on biomedical applications, specifically to obtain strong adhesion of the implant material layer, which is expected to improve osseointegration and reduce inflammation effects from implantation. The research method is experimental (testing), using both qualitative and quantitative methods. The coating method used is the Dip Coating method. Research variables include variations in the weight percentage (wt%) of PVA+ZrO2, and HA suspension, as well as variations in sintering temperatures, 800, 900 dan 9500C. The study results showed that the addition of Polyvinyl Alcohol (PVA) and Zirconium Oxide (ZrO2) in the suspension can reduce cracks on the test specimen layer. Optimal results were obtained with the addition of 20% PVA and ZrO2 weight at a sintering temperature of 900°C. The implant material surface was uniformly coated, and no cracks were found.
Maximizing Retreaded Tire Hardness: An Experimental Investigation Putri, Wahyu Handayani; Afrinaldi, Feri; Taufik, Taufik; Fernando, Ramadhan Rizki
METAL: Jurnal Sistem Mekanik dan Termal Vol. 8 No. 2 (2024): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.8.2.39-48.2024

Abstract

Tires are vehicle parts that have a significant economic impact. When the tires reach their end-of-life, they can be retreaded for further use. A company in Padang, Indonesia, manufactures retreaded tires with hardness specifications of at least 61 Shore A. The technology used by the company is the hot cure retreading. Historical data showed that the process produced 7% of defective tires and cost the company $16 per unit of defective tires. It was identified that curing temperature, mold pressure, inner tube pressure, curing time, and fuel type mixed with adhesive affect tires’ hardness. This paper aims to find the best combination of the above parameters so that the hardness of the retreaded tires is maximized. Experiments were performed, and the Taguchi method was employed to design the experiments. Since the experiments have five factors, and each involves two levels, the degree of freedom of the experiments is five. There were three replications for each treatment. Thus, an L8 orthogonal array was selected. The experimental results showed that the best combination of factors is curing temperature at 140 ˚C, mold pressure at 4 bar, inner tube pressure at 8 bar, curing time for 2 hours, and fuel mixed with adhesive was SBP. The above combination was predicted to produce an average hardness of 63.10 Shore A. A confirmation experiment was then performed by applying the above combination of factors, which resulted in an average hardness of 63.15 Shore A and no retreaded tires having hardness below 61 Shore A.
Tailored Polyurethane Composite Foams for Automotive and Biomedical Applications: Influence of Polyol–Isocyanate Ratios on Density, Texture, and Formation Time Ansyari, Muhammad Fadhillah; Utami, Yovi
METAL: Jurnal Sistem Mekanik dan Termal Vol. 9 No. 2 (2025): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.9.2.89-101.2025

Abstract

Polyurethane (PU) composite foams have gained significant attention in both the automotive and biomedical industries due to their lightweight structure, tunable mechanical properties, and excellent thermal and acoustic insulation. This study examines how varying the polyol–isocyanate ratio (1:1, 2:3, and 3:2) influences the physical characteristics of PU foams, particularly density, texture, and formation time. Using a batch mixing and molding process, three formulations were synthesized and evaluated. The foam with a 2:3 ratio produced a rigid structure (density: 0.045 g/cm³), suitable for automotive applications such as vibration dampening and structural interior panels. In contrast, the 3:2 ratio resulted in a soft, flexible foam (density: 0.047 g/cm³), which may be applicable in biomedical cushioning, prosthetics, or pressure-relieving supports. The 1:1 ratio generated a semi-rigid foam with the lowest density (0.032 g/cm³), indicating potential use in hybrid comfort–support systems. Formation times ranged from 7.18 to 15 minutes. The results demonstrate that the mechanical and physical properties of PU foams can be customized by adjusting the reactant ratios, enabling their application across multiple sectors. This study provides a foundational understanding of formulation–property relationships for PU composites and supports their integration into energy-efficient vehicles and human-centered biomedical devices.
Analysis of Computational Fluid Dynamics on 3D Printing Propeller Design using Thermoplastic Material Nurhidayanti; Muhammad Ikhsan; Muh. Abdillah
METAL: Jurnal Sistem Mekanik dan Termal Vol. 9 No. 2 (2025): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.9.2.122-129.2025

Abstract

The propeller is essential in generating thrust for various applications, from UAVS to ship propulsion and industrial ventilation. Propeller performance is greatly influenced by the characteristics of the fluid flow generated by the interaction between the propeller blades and the surrounding medium. 3D printing technology offers design flexibility and cost efficiency in propeller manufacturing. This study aims to analyse the effect of rotational speed variations on the performance of 3d printed propeller designs made of PLA. Simulation of Computational Fluid Dynamics (CFD) was used to evaluate the fluid flow velocity distribution, flow pattern, and flow type transition around the propeller. The results showed that the variation of rotational speed affects the fluid flow type, with low rotational speed producing laminar flow and high rotational speed producing transitional flow. This understanding is important for the optimisation of PLA 3D printing propeller design in improving efficiency and reducing noise.
Characterization of Biobriquette from A Mixture of Rubber Seed Shell Charcoal with Sugar Cane Bagasse Using Variations of Adhesive Types Harmiansyah; Renaldi, Rifki; Mufidah, Zunanik; Anika, Nova
METAL: Jurnal Sistem Mekanik dan Termal Vol. 9 No. 2 (2025): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.9.2.63-77.2025

Abstract

The use of energy, especially fossil fuels in the world, is increasing along with the increasing human population and increasing industrial development in various countries that use conventional energy. The way to reduce the use of conventional energy is to use renewable energy, one example of renewable energy is biobriquettes. Biobriquettes are solid fuels derived from the remaining organic matter that has undergone a compression process with a certain compressive force. The purpose of this study is to analyze the characteristics and determine the optimum parameters of biobriquettes from rubber seed shell charcoal and bagasse with variations in adhesives (tapioca flour, sago flour and molasses). The ratio of charcoal to adhesive mixture is 90:10, 85:15, 80:20. The stages of research on making biobriquettes include raw material preparation, carbonization, printing and product analysis. The results of the study showed that there were 2 characteristic parameters that met the standard values in all adhesive variations, namely moisture content and ash content, except for molasses adhesive variations with a ratio of 80:20 and the optimum parameters obtained in biobriquettes mixed with rubber seed shell charcoal and taboo pulp using tapioca adhesive with a ratio of 90:10 with a moisture content value of 4.53%, ash content 4.78%, flying substance content 31.33%, carbon content 59.36%, calorific value 4422 cal/g, combustion rate 0.097 g/min, and drop test 30.9%.
Enhancing Ionic Conductivity and Stability of Electrolyte Membranes: A Study on CQD-GO Composites for Aluminum-Air Batteries Ezi Puspita Dewi; Ridwan, Firman; Agusto , Dean Bilalwa; Wismalqi; Gusriwandi
METAL: Jurnal Sistem Mekanik dan Termal Vol. 9 No. 2 (2025): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.9.2.78-88.2025

Abstract

The development of efficient and sustainable energy storage technologies is crucial to address the depletion of fossil fuels and environmental pollution. This study focuses on the synthesis and characterization of a novel electrolyte membrane based on the integration of Carbon Quantum Dots (CQDs) derived from coconut-shell charcoal into a Graphene Oxide (GO) matrix for application in aluminum-air batteries. The CQDs were synthesized using a simple, low-cost, and environmentally friendly hydrothermal method, whereas the GO-based membrane was prepared via a solution casting technique. The physical and electrochemical properties of the resulting CQD-GO composite membranes were systematically investigated using various characterization techniques, including Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Electrochemical Impedance Spectroscopy (EIS), and Scanning Electron Microscopy (SEM). The results revealed that the incorporation of CQDs significantly enhanced the ionic conductivity, reduced the internal resistance, and improved the interfacial stability of the membrane compared with pristine GO. The synergistic effect between the CQDs and GO was attributed to the formation of hybrid conductive pathways and the enhanced ion mobility within the membrane structure. Furthermore, the CQD-GO membrane exhibited excellent stability in the electrochemical environment typically encountered in aluminum-air batteries. These findings highlight the potential of integrating biomass-derived CQDs with GO to develop high-performance electrolyte membranes for advanced energy storage applications, paving the way for more efficient and environmentally friendly aluminum-air batteries.
Investigating the Influence of Alumina Additive Concentrations on specific Fuel Consumption and Exhaust Opacity in Biodiesel Fuel Muh Abdillah; Nurhidayanti; Ariawan Bayu Wicaksono; Ishak
METAL: Jurnal Sistem Mekanik dan Termal Vol. 9 No. 2 (2025): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.9.2.117-121.2025

Abstract

This study investigates the effect of alumina (Al2O3) nanoparticle additives on the performance and emission characteristics of B30 biodiesel fuel under various engine loads. Fuel samples of pure B30 and B30 blended with Al2O3 at concentrations of 30, 50, 70, and 90 ppm were tested using a 3.5 kW diesel engine. The evaluation focused on specific fuel consumption (SFC), and exhaust opacity at loads of 1, 5, and 9 kg. The results show that SFC generally decreased with increasing load, with the lowest values achieved at 90 ppm, indicating improved combustion efficiency. In terms of emissions, the addition of Al2O3 at 30–50 ppm significantly reduced opacity, with 50 ppm showing the greatest effect, particularly at high loads. However, higher concentrations such as 90 ppm tended to increase opacity due to nanoparticle agglomeration, which hinders homogeneous mixing and combustion. Overall, the optimal performance improvement was observed at 50 ppm for emission reduction and at 90 ppm for fuel efficiency, demonstrating the potential of Al2O3 nanoparticles as effective additives in biodiesel applications.
Reliability-Based Preventive Maintenance Scheduling for Raw Mill Equipment to Minimize Downtime at PT X Alfadhlani, Alfadhlani; Zuhair, Ahmad; Fithri, Prima
METAL: Jurnal Sistem Mekanik dan Termal Vol. 9 No. 2 (2025): Jurnal Sistem Mekanik dan Termal (METAL)
Publisher : Department of Mechanical Engineering, Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/metal.9.2.146-157.2025

Abstract

PT X is one of Indonesia’s cement companies operating three active plants: Plant IV, V, and VI. Production data from 2022 and 2023 indicate that Plant V achieved only 79% and 86% of its production targets, with high downtime resulting from a reliance on corrective maintenance. This study proposes a preventive maintenance schedule to reduce downtime using the Reliability-Centered Maintenance (RCM) method for controlling critical components and an age-based replacement model for minimizing downtime. The analysis identified eight critical components in Raw Mill Machines 1 and 2, with reliability improvements ranging from 14% to 58%. Implementation of the proposed schedule resulted in increased machine availability by 5.1% and 4.65%, and system reliability improved by 33.71%. These findings demonstrate that RCM-based preventive maintenance effectively enhances operational performance.

Page 14 of 15 | Total Record : 143

 11   12   13   14   15 

Filter by Year

2017 2025


Reset
Filter By Issues
All Issue Vol. 9 No. 2 (2025): Jurnal Sistem Mekanik dan Termal (METAL) Vol. 9 No. 1 (2025): Jurnal Sistem Mekanik dan Termal (METAL) Vol. 8 No. 2 (2024): Jurnal Sistem Mekanik dan Termal (METAL) Vol. 8 No. 1 (2024): Jurnal Sistem Mekanik dan Termal (METAL) Vol 8, No 1 (2024): Jurnal Sistem Mekanik dan Termal (METAL) Vol. 7 No. 2 (2023): Jurnal Sistem Mekanik dan Termal (METAL) Vol 7, No 2 (2023): Jurnal Sistem Mekanik dan Termal (METAL) Vol 7, No 1 (2023): Jurnal Sistem Mekanik dan Termal (METAL) Vol 6, No 2 (2022): Jurnal Sistem Mekanik dan Termal (METAL) Vol 6, No 1 (2022): Jurnal Sistem Mekanik dan Termal (METAL) Vol 5, No 2 (2021): Jurnal Sistem Mekanik dan Termal (METAL) Vol 5, No 1 (2021): Jurnal Sistem Mekanik dan Termal (METAL) Vol 4, No 2 (2020): Jurnal Sistem Mekanik dan Termal (METAL) Vol 4, No 1 (2020): Jurnal Sistem Mekanik dan Termal (METAL) Vol 3, No 2 (2019) Vol 3, No 1 (2019) Vol 2, No 2 (2018) Vol 2, No 1 (2018) Vol 1, No 1 (2017): Volume 1, No 1 (2017) Vol 1, No 2 (2017): Jurnal Sistem Mekanik dan Termal (METAL) More Issue