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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 6 Documents
 1 
Search results for , issue "Vol. 3 No. 1 (2024): January-June 2024" : 6 Documents clear
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
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.

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