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All Journal Jurnal Sains dan Teknologi Jurnal Kimia dan Kemasan Jurnal Rekayasa Material, Manufaktur & Energi Jurnal Mekanik Terapan Mitra Akademia: Jurnal Pengabdian Masyarakat Teknologika JURNAL POLI-TEKNOLOGI Jurnal TNI Angkatan Udara Jurnal Polimesin Jurnal Sains Materi Indonesia Recent in Engineering Science and Technology
Vika Rizkia
Politeknik Negeri Jakarta
Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Transportation Other

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Journal : Recent in Engineering Science and Technology

 1 
The Modification of the Runner and Ingate Geometry to eliminate Misrun Defects on the Piston using Gravity Die Casting Rizkia, Vika; Fernanda Alvi Yasin, Muhammad; Banowati, Nabila; Noviaty, Veronika
Recent in Engineering Science and Technology Vol. 1 No. 02 (2023): RiESTech Volume 01 No. 02 Years 2023
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v1i02.13

Abstract

Piston is an essential component of an engine because it plays a crucial role in the combustion process that drives the motorcycle. Gravity dies casting has become an ideal method for producing pistons owing to its high-quality product, cost-effective with excellent dimensional accuracy, good surface finish, and performance characteristics. However, misrun defect may occur during metal filling and solidification. This study aims to find the suitable dimensions for motorcycle piston products without the presence of misrun using MAGMASoft. The geometry modification introduced in this research are an ingate area of 176, 264, and 352 mm2 as well as the angle of runner of 60, 160, and 180o. Modifying the ingate area to 264 mm2 and the angle of the runner to 160o eliminated the misrun defect in the piston product. This phenomenon results from the laminar flow, higher temperature, and quicker flow velocity of the molten metal as it fills the window (the thinnest part of the piston).
The Effect of 5wt.% and 10wt.% Salacca Frond Fiber Addition on Kevlar and Carbon Fiber Reinforced Epoxy using Vacuum Assisted Resin Transfer Molding (VARTM) Method for Bulletproof Vest Application Garjati, Vina Nanda; Vika Rizkia; Aggraeni, Nur Agnes; Muslimin
Recent in Engineering Science and Technology Vol. 1 No. 03 (2023): RiESTech Volume 01 No. 03 Years 2023
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v1i03.27

Abstract

Bulletproof vests as self-protection for military personnel are generally made from synthetic fiber-reinforced composites. Kevlar and carbon fiber reinforced composites have been able to withstand bullet penetration rates and have lightweight characteristics, but production costs with synthetic fibers are relatively expensive. The use of substitute materials from natural fiber is very potential, due to the abundance of natural fiber, lightweight, and relatively cheap price. One of the potential natural fibers is fiber from the salacca midrib. This study focused on the effect of adding salacca frond fiber on the composite characteristics of Kevlar fiber and carbon fiber, with SiC and Al2O3 fillers. The manufacture of this composite is carried out by the Vacuum Assisted Resin Transfer Molding (VARTM) method. There are 4 variations of fiber volume fractions and fillers as reinforcement added to this composite. From the results of observations with SEM, the results of the matrix and reinforcement are well bound. The ballistic test results show that all variations of test samples can withstand the bullet rate so that it does not penetrate. The results of mechanical tests show that currently the addition of salacca frond fiber has not significantly improved the mechanical properties of the composite
An Analysis of the Effect of Feeder Volume on Shrinkage Porosity Defects in Piston Products through the Gravity Die Casting Process Banowati, Nabila; Noviaty, Veronika; Fernanda Alvi Yasin , Muhammad; Mulyono, Sugeng; Rahmiati, Tia; Wahyudi, Wandi; Rizkia, Vika
Recent in Engineering Science and Technology Vol. 2 No. 02 (2024): RiESTech Volume 02 No. 02 Years 2024
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v2i02.56

Abstract

To achieve defect-free casting (soundness casting) with a minimal amount of shrinkage porosity, refinement during the casting process is necessary. In the gravity die casting process, there are parameters that lead to product defects, especially in the casting design, focusing on the gating system and feeder system as pathways for the flow of molten metal to supply the molten metal into the mold cavity. This research was conducted to examine the effect of adding feeder dimensions on shrinkage porosity, specifically on Al-Si piston products with a Silicon content of 12-13%. Feeder dimensions were varied in nine variations by adding height and width to the feeder gate, initially measuring 90mm in height and 32mm in width, along with the addition of insulation to the feeder to retain the heat of the casting process. Cooling used water and argon, with water placed at the center core and pin core and argon placed on the outer mold, with a solidification time of 150 seconds and pouring time of 3 seconds considered constant. This study used a Computer Aided Engineering (CAE) approach, namely MagmaSoft or the application of software to model the gravity casting system process. The results showed the lowest percentage of shrinkage at feeder dimensions of 114mm in height and 45mm in width with a mold temperature of 220°C was 0.76% of the product
Enhancing Proton Exchange Membrane Fuel Cell (PEMFC) Performance through Optimized Design of Parallel Channel Bipolar Plates Moh Nurkhamal; Rizkia, Vika; Vina Nanda Garjati; Radhi Maladzi
Recent in Engineering Science and Technology Vol. 3 No. 01 (2025): RiESTech Volume 03 No. 01 Years 2025
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v3i01.94

Abstract

In this modern era, the demand for efficient and environmentally friendly energy sources is increasing. One technology with significant potential to meet this demand is the Proton Exchange Membrane Fuel Cell (PEMFC). This study aims to investigate the influence of channel width and depth variations in parallel bipolar plate designs on PEMFC performance. Computational Fluid Dynamics (CFD) was employed to analyze hydrogen flow distribution and pressure across various design variations. The results demonstrate that channel width and depth significantly affect pressure distribution and flow velocity, which in turn influence the efficiency of the PEMFC system. Increasing channel width generally reduces maximum pressure, while deeper channels help to distribute pressure more evenly across the bipolar plate. Optimized channel width and depth can enhance PEMFC operational performance by reducing pressure drop and promoting uniform flow distribution.
Co-Authors Aggraeni, Nur Agnes Alifianto Dimas Aditya Arif Dermawan Arnanda, Rachmat Azam Milah Muhamad Badrul Munir, Badrul Bambang Suharno Banowati, Nabila Belyamin Damisih Dewin Purnama Dhiya Luqyana Emmidia Djonaedi Fadlilah, Muhammad Fernanda Alvi Yasin , Muhammad Fernanda Alvi Yasin, Muhammad Garjati, Vina Nanda Gunadi, Gun Gun Ramdlan Hapsari, Ade Utami Heryana, Ghany Iqbal, Adimas Habib Iwan Susanto Jarot Raharjo Johny Wahyuadi Soedarsono Luqyana, Dhiya M. Abdul Ghofur Marentiko, Fahri Moh Nurkhamal MUSLIMIN Muslimin Muslimin Nanda Gardjati, Vina Nisrina Zahrah, Firyal Noviardi, Luthfi Noviaty, Veronika Nur Agnes Eka Anggraeni Pramono, Agus Edy Pravitasari, Retna Deca Radhi Maladzi Rahmiati, Tia RATNA KHOIRUNNISA Ridlwan, Hasvienda Mohammad Ryan Nugraha Saidatuningtyas, Ifa Sugeng Mulyono Tatun Hayatun Nufus Tisane Ardhan, Dhea Vina Nanda Garjati Wahyudi, Wandi Yudha Pratesa