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jes
Published by Yayasan Kawanad
ISSN : 28288106     EISSN : 2828805X     DOI : https://doi.org/10.56347/jes
Core Subject : Engineering,
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering
The Journal of Engineering Science is not limited to a specific aspect of science and engineering but is instead devoted to a wide range of subfields in the engineering sciences. While it encourages a broad spectrum of contribution in the engineering sciences, its core interest lies in issues concerning material modeling and response. Articles of interdisciplinary nature are particularly welcome. All published article URLs will have a digital object identifier (DOI).
Arjuna Subject : Teknik (semua kategori) - Teknik Kontrol dan Sistem
Articles 80 Documents
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Eksperimen Pengaruh Kecepatan Pada Diameter Nozzle 2,5 mm dalam Proses Laser Cutting Masri; Suhaeri; Machmud, M. Nizar; Zainuddin; Saifuddin; Azhar
Journal of Engineering and Science Vol. 2 No. 2 (2023): July-December 2023
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v2i2.168

Abstract

This experimental study examines the impact of speed variations on the 2.5 mm nozzle diameter in low-carbon steel laser cutting. The primary objective is to optimize the roundness of the cut by considering cutting speed factors. Through a series of experiments conducted on low-carbon steel plates measuring 200 mm x 200 mm, utilizing a 2.5 mm nozzle diameter with speed variations of 2, 3, and 4 m/minute, the research measures roundness quality using a digital caliper. Results indicate that cutting speed influences roundness quality, with the lowest deviation observed at a speed of 2 m/minute and the highest at 3 m/minute. The study also highlights that increased cutting speed and the use of a larger nozzle require higher gas pressure.
Effect of Maleic Anhydride Polypropylene on Flexural Properties of Hybrid Kenaf - Sugar Palm Fibre Reinforced Polypropylene Composites Bachtiar, Dandi; Siregar, Januar Parlaungan; Iqbal, Mohd; Masri; Zulfadhli; Muhibbuddin
Journal of Engineering and Science Vol. 2 No. 2 (2023): July-December 2023
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v2i2.169

Abstract

This study was focused on the characterize the hibridisation of kenaf and sugar palm fibre in reinforcing the polypropylene matrix. Addition of MAPP (Maleic Anhydride Polypropylene) was used as compatibilizing agent with variation of 2%, 3% and 5%. The specimen materials were prepared with 30% amounts of fibres while the ratios between kenaf and sugar palm fibre are 10:20, 15:15 and 20:10. The composites were fabricated using melt mixer technique and followed by compression molding process. The specimens were cut according ASTM Standard D790 for conducting the flexural testing. After testing done, the results shown that flexural strength of composites tend to decreased when the content of MAPP increased. The ultimate flexural strength was attained at 2% MAPP addition of the hybrid composites with 20% kenaf fibres. Among the composites with different ratios, the hybrid composites that contain more kenaf fibres exhibit the higher value in flexural strength than the composites that contain more sugar palm fibres.
Analisis Komprehensif: Perbandingan Platform Perangkat Lunak Artificial Intelligence (AI) untuk Meningkatkan Inovasi dalam Desain Interior Tahsin, Muhammad; Afkar, Muhammad Agha
Journal of Engineering and Science Vol. 2 No. 2 (2023): July-December 2023
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v2i2.182

Abstract

This research aims to conduct a comparative study of artificial intelligence (AI) software platforms used in interior design. The focus of the study is to evaluate the effectiveness, sophistication, and performance of various AI platforms in supporting innovation and efficiency in the internal design process. This research method involved an in-depth analysis of several leading AI platforms used in interior design, reviewing their superior features, personalization capabilities, and integration with other design tools. In addition, this research will evaluate the impact of using these platforms on project completion time, design results accuracy, and client satisfaction. The results of this research can provide valuable insight for interior design professionals. By understanding how AI platforms compare, professionals can make more informed decisions in selecting the solution that best suits their project's needs. In an era of rapid technological development, this research can provide helpful guidance for optimally utilizing AI technology, thereby achieving interior design results that are not only innovative but also efficient. The conclusions from the research can provide beneficial advice in optimally utilizing AI technology to achieve innovative and efficient interior design results. By identifying the strengths and weaknesses of each platform, interior design professionals can optimize the use of AI technology according to their project needs and preferences. As a result, this research can positively contribute to the development of the interior design industry, creating a more productive and satisfying work environment for professionals and clients.
Fatigue Analysis on Hybrid Sugar Palm-Kenaf Fibre Reinforced Polypropylene Composites Bachtiar, Dandi; Siregar, Januar Parlaungan; Zulfadhli; Masri; Arhami; Siregar, Ramdhan Halid; Jalil, Saifuddin Muhammad
Journal of Engineering and Science Vol. 3 No. 1 (2024): January-June 2024
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v3i1.209

Abstract

ABSTRACT Hybrid natural-natural fibre reinforced polymer composites become attractive alternative to seek the friendly-environmentally materials. Study on the durability level of the hybrid composites have the importance reason due to the role in application as structural function. This study focuses on examining the fatigue strength of polypropylene polymer composites reinforced with hybrid sugar palm-kenaf fibres. The hybrid composite materials were prepared by mixing the fibres and matrix with several compositions. There are five composition types of specimens that evaluated, such as 70:10:10, 70:15:15, 70:20:10, 80:10:10 and 90:5:5. The hybrid composites were composed by PP, sugar palm fibre and kenaf fibre. Furtheremore the tensile test were conducted to find the value of ultimate tensile strength for every specimens of hybrid composites. The fatigue test also were conducted with four level of stress i.e. 80%, 70%, 60% and 50%. The results show that in the lower level of stress, the hybrid composites with higher content of sugar palm fibre posses the better performance of fatigue life compare to the others
Analysis of the Characteristics of Carbon Prepreg Sandwich Composites with Polyurethane Foam as Core Material in the Body of the Malem Diwa Proto Vehicle Alsudais, Alsudais
Journal of Engineering and Science Vol. 3 No. 1 (2024): January-June 2024
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v3i1.247

Abstract

A sandwich composite, formed by the macroscopic integration of two or more materials with distinct properties, exhibits unique mechanical characteristics. This study investigates the influence of carbon prepreg layer thickness and polyurethane foam core thickness on the mechanical properties of sandwich composites through tensile and flexural testing. Tensile tests followed ASTM D3039 standards, while flexural tests adhered to ASTM C393. Composites were fabricated with either two or four layers of carbon prepreg using an autoclave process. The two-layer composite specimens measured 250 mm in length, 25 mm in width, and 0.5 mm in thickness, whereas the four-layer specimens had a thickness of 1 mm. Flexural test specimens had dimensions of 250 mm in length, 75 mm in width, a 10 mm core thickness, and a 2 mm skin thickness. The two-layer composite achieved a maximum tensile stress of 645.1 MPa, a Young’s modulus of 39.89 GPa, and an elongation of 2.08%. The four-layer composite reached a maximum tensile stress of 955.05 MPa, a Young’s modulus of 34.93 GPa, and an elongation of 1.82%. The average flexural strength of the polyurethane foam core sandwich composite was 10.6 MPa. These results indicate that layer thickness significantly affects tensile properties, while the core material influences flexural performance.
Observation of Defects in Aluminum 6061 Castings Using Dye Penetrant Testing with Varied Pouring Temperatures Zhafir, Ammar
Journal of Engineering and Science Vol. 3 No. 1 (2024): January-June 2024
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v3i1.248

Abstract

Aluminum 6061, an Al-Mg-Si alloy, exhibits excellent extrudability. The study examines casting defects under pouring temperatures of 700°C, 750°C, 800°C, and 850°C. Aluminum is melted in a gas furnace and poured into a mold designed for the Constrained Rod Casting (CRC) method. Dye penetrant testing identifies surface defects, such as cracks and porosity, using colored penetrant fluids to reveal discontinuities. Results indicate that pouring temperature significantly affects defect type and severity. At 700°C, minor porosity is observed with minimal surface issues. Conversely, at 850°C, linear cracks exceeding 1.5 mm and extensive porosity appear, attributed to high thermal contraction and uneven solidification. An optimal pouring temperature range for Aluminum 6061 minimizes defects while maintaining casting quality.
Experimental Study on the Effect of Wet-Dry Cycles on Chloride Ion Penetration in Reinforced Concrete Noviana, Dwi
Journal of Engineering and Science Vol. 3 No. 1 (2024): January-June 2024
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v3i1.250

Abstract

Corrosion of reinforcement due to chloride ion penetration from seawater significantly affects the durability of reinforced concrete structures. The diffusion of chloride ions into concrete accelerates this degradation. The present study monitors corrosion potential on concrete surfaces using the half-cell potential method and measures chloride ion penetration depth via the chloride colorimetric method. Findings indicate that wet-dry cycles accelerate chloride ion penetration, with longer soaking intervals correlating with increased corrosion levels. Within 30 days, concrete initially free of corrosion exhibited potential values ranging from -417 mV to -489.3 mV after wet-dry treatment. Furthermore, colorimetric analysis revealed clear differences in ion diffusion before and after treatment.
Analysis of Contact Force and Deflection in Drop Weight Impact of Abaca Fiber Sandwich Composite with Aluminum Alloy Using Finite Element Method Al-Afkar, Haris
Journal of Engineering and Science Vol. 3 No. 1 (2024): January-June 2024
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v3i1.252

Abstract

The study simulates a drop weight impact test on sandwich composite materials composed of abaca fiber with an aluminum honeycomb core, utilizing the Finite Element Method (FEM) via Ansys LS-DYNA 2023 R1 software. The specimen model adheres to ASTM D7136 standards, incorporating variations in fiber orientation (woven, unidirectional, random) and impactor velocities of 1 m/s, 2 m/s, 2.43 m/s, and 3 m/s. Simulation outcomes reveal that at 1 m/s, the random orientation exhibited the highest deformation at 2.36 mm, compared to 1.96 mm for woven and 2.06 mm for unidirectional. At 3 m/s, deformation increased markedly, with random reaching 7.54 mm, unidirectional 5.61 mm, and woven 5.07 mm. The unidirectional orientation recorded the highest peak contact force at 3 m/s, reaching 3800 N, followed by woven and random. Energy absorption escalated with velocity, peaking at 17 J for unidirectional at 3 m/s. The contact force versus deflection curves indicate a penetration failure mode across all specimens. Fiber orientation significantly influences structural resistance to impact, with unidirectional excelling in peak force resistance and random demonstrating superior energy absorption through deformation.
Experimental Investigation of Load Effects on Diesel Engine Performance Using Waste Tire Oil Blended with Dexlite Fuel Afkar, Irsyadul
Journal of Engineering and Science Vol. 3 No. 2 (2024): July-December 2024
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v3i2.257

Abstract

Waste tires represent a form of inorganic waste that resists natural degradation. In Indonesia, estimates suggest around 11 million tons of used tires accumulate annually, with volumes expected to rise each year. This trend poses future environmental challenges. To address this issue, the study examines converting waste tires into fuel oil. The objective focuses on assessing how blending waste tire oil with dexlite influences diesel engine operation. The research involves two phases: testing fuel characteristics from tire oil and evaluating diesel engine performance. Laboratory tests yield tire oil properties including a heating value of 43,080 kJ/kg, viscosity of 1.12 mm²/s, density of 877 kg/m³, and cetane index of 97.1. Blends incorporate tire oil at 30%, 40%, and 50% with dexlite, tested on a diesel engine. Results indicate the highest engine power from the 30% blend (MB-30) at 1.132 HP under 2000 Watt load. The lowest specific fuel consumption occurs with the 50% blend (MB-50) at 0.528 kg/kWh under 1000 Watt load, while the highest thermal efficiency reaches 14.9% with MB-50 under 1000 Watt load.
Evaluation of the Effects of Five Mold Temperature Variations on Cooling Rate and Contraction Force in the Forming of Aluminum 7075 Alloy Pratama, Muhammad David
Journal of Engineering and Science Vol. 3 No. 2 (2024): July-December 2024
Publisher : Yayasan Kawanad

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56347/jes.v3i2.260

Abstract

The 7075 series aluminum alloy, renowned for its tensile strength of up to 572 MPa, is widely employed in the production of aircraft components requiring exceptional structural integrity, such as wing panels, tail assemblies, fuselage frames, and stringers. The airframe, serving as the primary load-bearing structure, is critical in distributing stresses during both flight and ground operations. This study examines the influence of mold temperature variation on thermal contraction and applied force in 7075 aluminum alloy, using the Constrained Rod Casting (CRC) method. Five mold temperature settings—150 °C, 200 °C, 250 °C, 300 °C, and 350 °C—were analyzed to determine their relationship with cooling rate. Data were obtained through cooling curve observations, followed by curve analysis to extract relevant parameters. The results indicate that the fastest cooling rate occurred at 350 °C (25.1 °C/s), while the slowest occurred at 200 °C (13 °C/s). The highest thermal contraction was recorded at 350 °C (316.54 N), whereas the lowest was observed at 150 °C (252.35 N). Variations in cooling rates are attributed to differences in both mold temperature and the duration of the solidification process.

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