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All Journal G-Tech : Jurnal Teknologi Terapan
Nurlia Pramita Sari
Politeknik Negeri Malang, Indonesia
Computer Science & IT Decision Sciences, Operations Research & Management Energy Engineering

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Pengujian Kekuatan Bending dan Impak Komposit Sandwich Serat Gelas dengan Inti Kayu Balsa Agus Dani; Nurlia Pramita Sari; Fauzan Baananto; Sulistyono Sulistyono
G-Tech: Jurnal Teknologi Terapan Vol 8 No 3 (2024): G-Tech, Vol. 8 No. 3 Juli 2024
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33379/gtech.v8i3.4370

Abstract

The strength of a sandwich composite structure is influenced by the mechanical properties of the skin and core, the thickness of the skin and core, and the strength of the bond between the skin and core. Balsa wood is a suitable core material for sandwich composite applications due to its high strength-to-weight ratio. Another advantage of balsa wood is that it is a widely available and relatively inexpensive material. In this study, sandwich composites with glass fiber skin and balsa wood core were made using the hand lay-up method, using epoxy resin. Variations in the direction of woven fibers (45o/45o) and straight (0o/90o) and variations in the weight of the weave 200 GSM, 400 GSM, and 600 GSM were tested to determine the mechanical bonding. Mechanical bonding testing was carried out using the three-point bending test method (three-point bending) and impact testing. The results showed that the orientation of the fibers affects the flexural stress and impact of the sandwich composite. Straight fiber orientation has higher stress and impact values than diagonal orientation. The highest stress value was at 400 GSM straight fiber orientation variation with a flexural stress value of 149.53MPa and had the highest impact value of 0.052 Joule/mm
Design and Manufacture of Speedometer Covers using the House of Quality (HOQ) Approach Elka Faizal; Nurlia Pramita Sari; Hangga Wicaksono; Bayu Pranoto; Nicky Suwandhy Widhi Supriyanto; Subagiyo Subagiyo
G-Tech: Jurnal Teknologi Terapan Vol 9 No 3 (2025): G-Tech, Vol. 9 No. 3 July 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i3.7119

Abstract

This study aims to design and fabricate a speedometer cover for Yamaha Aerox and N-Max 155 motorcycles using 3D printing technology, guided by the House of Quality (HOQ) framework. The increasing consumer demand for motorcycle accessories motivated this research. A structured design process was implemented, beginning with a consumer needs analysis conducted through questionnaires and surveys to identify user expectations. These needs were systematically translated into technical requirements using the HOQ method. The design stage utilized 3D CAD modeling and 3D scanning to ensure accurate fitting to the speedometer unit, followed by prototyping using fused deposition modeling (FDM) 3D printing. The final prototype exhibited key consumer-desired attributes such as heat resistance, structural durability, and a secure fit. Results indicate that integrating the HOQ approach with digital fabrication methods effectively aligns product design with user expectations. This study demonstrates the potential for further development of customizable motorcycle accessories using a consumer-driven and technology-supported design process.
Improving the Hardness of 3D Printable ABS Filament Through Thermal and Cooling Process Control Nurlia Pramita Sari; Akhmad Faizin; Bayu Pranoto; Mochamad Muzaki; Firza Nurdin Maulana
G-Tech: Jurnal Teknologi Terapan Vol 9 No 4 (2025): G-Tech, Vol. 9 No. 4 October 2025
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v9i4.7838

Abstract

The properties of filament are widely recognized as critical factors influencing the performance of fused filament fabrication (FFF) in 3D printing. Acrylonitrile Butadiene Styrene (ABS) is frequently utilized in this process due to its high strength, durability, and availability. Nevertheless, the characteristics of the filament are highly dependent on processing parameters, particularly extrusion temperature and cooling method, which directly affect its mechanical behavior and dimensional stability. The objective of this study was to evaluate the effect of extrusion temperature and cooling medium on the hardness of ABS filaments produced using a single-screw plastic extruder. Experimental procedures were performed at three extrusion temperatures, namely 180 °C, 200 °C, and 220 °C, with cooling applied by water immersion and by air using a blower. The results demonstrated that air cooling produced superior hardness values and more consistent dimensional stability compared to water cooling. The optimum condition was observed at an extrusion temperature of 180 °C under air cooling, which resulted in the highest hardness values along the filament length (95.63HA  average). These findings suggest that careful optimization of extrusion parameters, particularly the selection of an appropriate cooling method, is essential to improve filament quality for additive manufacturing applications.
Co-Authors Agus Dani Akhmad Faizin Bayu Pranoto Elka Faizal Fauzan Baananto Firza Nurdin Maulana Hangga Wicaksono Mochamad Muzaki Nicky Suwandhy Widhi Supriyanto Subagiyo Subagiyo Sulistyono Sulistyono