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All Journal Cylinder : Jurnal Ilmiah Teknik Mesin
Sutjiadi, Adrian
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Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mechanical Engineering

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Hygrothermal Effect on Glass Fiber Reinforced Plastic (GFRP) Under Seawater Immersion Sutjiadi, Adrian
Cylinder : Jurnal Ilmiah Teknik Mesin Vol 10 No 2 (2024): OKTOBER 2024
Publisher : Department of Mechanical Engineering Atma Jaya Catholic University of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/cylinder.v10i2.5923

Abstract

Glass Fiber Reinforced Plastic (GFRP) is extensively used for corrugated roofing sheets and gutters in Indonesia, especially in corrosive environments, due to its superior corrosion resistancecompared to steel. Despite its widespread application in coastal areas, limited studies have examined the durability of GFRP when exposed to seawater and heat. This research investigates the influence of hygrothermal conditions on the physical and mechanical properties of GFRP. Samples were immersed in seawater at temperatures of 30°C, 40°C, and 60°C for 3 and 6 months. Results show that hygrothermal exposure leads to degradation in physical but notmechanical properties. Physical properties were evaluated using mass gain measurements, hardness testing, and Scanning Electron Microscopy (SEM), while mechanical properties were assessed via tensile testing.The result shown all specimen have increased mass up to 3,8% and decrease in hardnessup to 56%. SEM also shown several dark spot which indicatevoid. SEM analysis revealed the presence of dark spots, indicating void formation. These findings underscore the vulnerability of GFRP to hygrothermal conditions, raising concerns about its long-term durability in coastal applications.
Perilaku Termal Baterai Kendaraan Listrik pada Siklus Mengemudi NEDC dan WLTP: Studi Simulasi Menggunakan GT-Suite Said, Mohd Farid bin Muhamad; Sutjiadi, Adrian; Setiawan, Yosua
Cylinder : Jurnal Ilmiah Teknik Mesin Vol 11 No 1 (2025): April 2025
Publisher : Department of Mechanical Engineering Atma Jaya Catholic University of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/cylinder.v11i1.6678

Abstract

This study examines the thermal behaviour of a LiFePO₄ battery pack in a converted electric vehicle using GT-Suite simulation. The base vehicle, a Toyota Avanza originally powered by a 1.3-litre engine, was retrofitted with a 60 kW synchronous AC motor and a 268.8 V, 40.32 kWh battery pack. Simulations were conducted under NEDC and WLTP driving cycles, both with and without passive cooling. Results showed that battery temperature peaked at 45.3°C (NEDC) and 71.6°C (WLTP) without cooling, and was reduced to 36.6°C and 48.0°C respectively with passive cooling. Temperature spikes coincided with rapid acceleration and high-speed phases, highlighting the influence of discharge current on battery heating. These findings demonstrate the importance of thermal management in EV conversions and the effectiveness of passive cooling. Future work will focus on experimental validation and discharge current control via a battery management system (BMS) to ensure battery safety and longevity.
Infill Density Effects on Impact Strength of PLA+ Sutjiadi, Adrian; Setiawan, Yosua
Cylinder : Jurnal Ilmiah Teknik Mesin Vol 11 No 2 (2025): Oktober 2025
Publisher : Department of Mechanical Engineering Atma Jaya Catholic University of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25170/cylinder.v11i2.7036

Abstract

3D printing is an additive manufacturing method. In its process, several parameters can be adjusted to achieve the desired printing results. This study examines the effect of infill percentage on the Charpy impact strength of PLA+ materials made using the fused deposition modeling (FDM) method. The specimens used follow the ISO 179-1 type 1 standard without notches and are made with infill variations of 20%, 40%, 60%, 80%, and 100%. Each variation is tested five times using a JB-S300 Charpy impact tester. The absorbed energy is then calculated into the Charpy impact strength (kJ/m²) according to the ISO 179-1 standard. The results show that the impact strength increases with increasing infill, from 10.9 kJ/m² at 20% infill to 30.4 kJ/m² at 100% infill. These results emphasize the effect of infill on energy absorption and the importance of parameter control to improve the consistency of results in FDM printed PLA+ components.
Co-Authors Said, Mohd Farid bin Muhamad Setiawan, Yosua