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Ozkar F Homzah
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AUSTENIT
Published by Politeknik Negeri Sriwijaya
ISSN : 20851286     EISSN : 26227649     DOI : https://doi.org/10.53893/austenit
Core Subject : Science, Engineering,
Automotive Engineering Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering
AUSTENIT (pISSN 2085-1286 and eISSN 2622-7649) is a peer-reviewed open access journal published by Mechanical Engineering Department, Politeknik Negeri Sriwijaya. Focused on original articles in the form of technical and vocational research results or literature review which provides insight in the field of mechanical engineering and machinery that includes Mechanical Structure, Manufacturing, Metallurgy Sciences and Engineering, Design Engineering, Maintenance and Repair Engineering, Fluid Dynamics, HVAC (Heating, Ventilation and Air Conditioning), Heat-Mass Transfer, Sustainable Renewable Energy, Mechatronic and Control Systems or as well as other related Mechanical Engineering field study.
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Articles 9 Documents
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Search results for , issue "Vol. 15 No. 1 (2023): AUSTENIT: April 2023" : 9 Documents clear
PENGARUH FRAKSI VOLUME DAN ORIENTASI PADA KOMPOSIT SERAT GAMBAS SERTA TEBU TERHADAP KEKUATAN BENDING Ahmad Zamheri; Dicky Seprianto; Sailon Sailon; Hopay Tamilio; Ekki Andika; Rizki Ramadoni
AUSTENIT Vol. 15 No. 1 (2023): AUSTENIT: April 2023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v15i1.5188

Abstract

The purpose of this study is to determine the influence of volume fractions and orientation directions on the composite of gambas fiber and sugarcane fiber on bending strength. In this study, the variation in the volume fraction of resin, gambas fiber, and sugarcane fiber was (Resin 60%: Sugarcane Fiber 20%: Gambas Fiber 20%), (Resin 70%: Sugarcane Fiber 15%: Gambas Fiber 15%), and (Resin 80%: Sugarcane Fiber 10%: Gambas Fiber 10%) with the orientation direction of gambas fiber and sugarcane fiber 90°/90°, 90°/45°and 90°/0°. In this test, the bending test specimen was made according to the ASTM D 790-02  standard and the test result data were analyzed using the Two-Way ANOVA method assisted by Microsoft Exel software. This study showed that the volume fraction (Resin 60%: Sugarcane Fiber 20%: Gambas Fiber 20%) and the orientation direction of gambas fiber and sugarcane fiber 90°/90° have  the best bending strength  which is 48.33 (N/,) this value is higher than that of Multiplex with a bending strength value of  26,60 MPa.
THE EFFECT OF QUENCHING TREATMENT BY VARIATION OF COOLING MEDIA (WATER, USED OIL, COOKING OIL) ON EGREK HARDNESS Fenoria Putri; Indra Gunawan; Dany Agung Rizky
AUSTENIT Vol. 15 No. 1 (2023): AUSTENIT: April 2023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v15i1.5450

Abstract

By using water on the gilding, the blacksmith's Egrek was hardened.  The Egrek must have tough hardness. The low hardness causes the Egrek to wear out frequently, so consumers criticize the hardness and toughness of blacksmith products.  Due to the wrong heat treatment, the Egrek cause is easily destroyed. The purpose of this study was to determine the effect of quenching treatment with various cooling media such as water, used oil, and cooking oil on increasing the hardness of blacksmith products. This research method is an experimental quenching using water, used oil, and cooking oil at 800°C, 850°C, and 900°C, with a holding time of 30 minutes. Rockwell hardness test, statistical data processing using ANOVA and supported by the use of expert design software. Having an average carbon content of 0.379%, Egrek's raw material is made of medium carbon steel. Based on the results of the quenching process with water, used oil, and cooking oil affect hardness. The quenching process of the cooking oil cooling medium that occurs at 800°C with a hardness value of 50.1 HRC produces a minimum hardness value, while the maximum average hardness lies in the water cooling medium with a temperature of 900°C of 60.4 HRC. The results of the percentage contribution of each are used oil by 96.37%, cooking oil by 96.61%, while water cooling media contributed by 88.41%. So that the cooling media for used oil and cooking oil can also be used as an alternative choice of cooling media.
OPTIMIZED CONTROL OF THE PHYSICAL BATTERY SYSTEM Pham Van De
AUSTENIT Vol. 15 No. 1 (2023): AUSTENIT: April 2023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v15i1.6303

Abstract

Today, a significant issue for many nations worldwide is a shortage of energy. Renewable energy sources, particularly solar energy, are being investigated as additional energy sources to address the aforementioned issue. The high investment cost and poor performance of solar energy, however, provide the biggest challenge. This study only addresses the power optimization problem. It is suggested that the method used to determine the solar system's maximum power point modify incremental conductance. Adapted Incremental Conductance algorithm based on Incremental Conductance conventional techniques. The Modified Incremental Conductance method, however, has several exceptional advantages since it has a voltage change (V) that is not constant but fluctuates in an ideal manner to achieve the maximum power point as soon as possible. The voltage V is greater away from the peak power point while it is zero at the peak power point. Modified incremental conductivity algorithm to find peak power point faster than traditional algorithms. With maximum power point change reducing ambient power loss at the highest powers point. This helps to optimize voltage difference value.
COMPARISON OF THERMAL INSULATION OF GLASS WOOL AND SUPERBTEX TO THE DRYING RATE OF FISH DRYING EQUIPMENT Aneka Firdaus; Gunawan Gunawan; M. A. Ade Saputra; Nina Haryani
AUSTENIT Vol. 15 No. 1 (2023): AUSTENIT: April 2023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v15i1.6546

Abstract

The use of glasswool or Superbtek insulation material in a fish dryer is one way to reduce the heat coming out of the fish dryer, so that the heat temperature utilized for the fish drying process will be maximized. These two insulation materials will be compared which one is better able to reduce heat. This fish dryer will be made with certain dimensions as needed, this tool design measures: 100 cm long, 50 cm wide, and 50 cm high for the outer wall, and 90 cm long, 40 cm wide, 40 cm high for the inner side wall. The height of the tool frame legs is 70 cm. Glasswool and Superbtex materials are affixed to the outside wall. The two insulation materials will be analyzed how much they affect the heat on the wall of the dryer, aiming to get the best insulation material between the two for the drying rate. With the experimental method, it was found that using Superbtex insulation material; the temperature inside the dryer was 94.200C and the temperature of the outer wall was 45.680C, the average drying rate was 4.306 gr/min, with the use of Glassswool insulation, the temperature of the inside wall of the dryer was 83.50C and the temperature of the outside wall of the dryer was 47.580C, the average drying rate was 3.489 gr/min. So superbtex insulation material is better to use than glasswool insulation material.
OPTIMIZATION OF THE REPLACEMENT PROCESS FOR THE BRAKE SHOES ISUZU GIGA TRUCK AT PT AI-ISO DM JAKARTA BRANCH Vuko A T Manurung; Mohammad R. Dwicahyo; Yohanes T. Wibowo; Setyo Haryadi
AUSTENIT Vol. 15 No. 1 (2023): AUSTENIT: April 2023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v15i1.6621

Abstract

PT AI-ISO workshop on DM Jakarta provides various repair and periodic maintenance services. In periodic maintenance, brake repair jobs have problems replacing the brake pads (brake shoe set) of Isuzu Giga Trucks, which takes about 9 hours. To reduce the processing time, an improvement process is carried out to shorter processing time, so the customer feels more satisfied with repairing his vehicle. From observations, the length of work time was due to the process of changing the brake pads outside the workshop due to the absence of tools to install the brake pads. The repair shop offers to replace a set of brake pads, but the price is higher than just replacing the brake pads, so the customer makes this choice. The improvement made was the manufacture of a rivet installation tool on the brake pads based on the workings of a rivet machine. First, it is necessary to make a brake pad holder so that it does not shift when pressed and ensures that the pressure acting on the rivet is as requested. This tool is also equipped with a Standard Operation Procedure to make it easier for technicians to replace brake pads. The result is a decrease in processing time for the brake pad replacement process from an average of 9 hours to 5 hours. With these tools, repairing the brake system can be accelerated and within the safe limits required in the vehicle's manual, and the customer will be more satisfied.
THE EFFECT OF DIFFERENT STRUCTURE AND GRADIENT INFILL ON MECHANICAL BEHAVIOR POLYLACTIDE ACID MATERIALS (PLA) Imam Akbar; M Rizky Hidayat; Dewi Rawani; Rita Maria Veranika; Hariman Al-Faritzie; Romli Romli
AUSTENIT Vol. 15 No. 1 (2023): AUSTENIT: April 2023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v15i1.6631

Abstract

The purpose of this study is to analyze the effect of our gradient infill on the mechanical behavior of polylactide acid (PLA) materials resulting from 3d printing, which has an impact on the efficiency of material use while still providing good mechanical support. In this study, the specimens were designed using nTopology software and there were 4 variations of the structure, namely square, honeycomb, diamond, and gyroid, each of which was made gradient and non-gradient, then a bending test was carried out to determine its mechanical behavior thats PLA materials. The results of this study indicate that a comparison between specimens with gradient and non-gradient models with 50% porosity can increase the deflection of the specimen, namely square 15.7-19.1 mm, honeycomb 16.3-20.6 mm, Diamond 19.7-21.8 mm, and gyroid 20.3-22.1 mm, with an average deflection of 2.04 mm. In addition, there is a linear correlation of the relationship between thickness to deflection and flexural modulus whereas the thickness value increases, the deflection and flexural modulus will increase. The conclusion of this research is that giving a gradient to the structure can improve mechanical behavior, especially deflection.
ANALISA KERUSAKAN PIPA DUCTING SCRUBBING BERBAHAN CARBON STEEL SS400 DI PABRIK PUPUK NPK-1 PT PUSRI PALEMBANG Perez Nasrah; Ozkar F. Homzah
AUSTENIT Vol. 15 No. 1 (2023): AUSTENIT: April 2023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v15i1.6684

Abstract

The purpose of this research was to discover the various reasons of failures and appropriate repair options for the line ducting cleaning unit system at PT Pusri Palembang's NPK-1 production facility. The main cause of the failures was determined to be a deterioration of the ducting line material caused by corrosion on the inner side of the ducting pipe composed of SS400 carbon steel. We made investigation including an analysis of the thickness of the damaged ducting pipe, as well as a visual check. The investigation showed that the corrosion caused an average drop in pipe wall thickness of up to 70%. The fixed load superimposed on the ducting pipe and the carrying capacity of the piping affect ducting strength, but corrosion on the inner surface of the pipe, caused by direct contact with corrosive and hygroscopic process dust, reduces ducting wall strength against axial and lateral loads. A Failure pipe caused losses and unscheduled shutdowns of production process, will be increased the repair costs and increases the risk of human accidents. The suggestion of investigation results is to upgrade the ducting pipe materials to knowed corrosion-resistant materials, such as stainless-steel grade SS304. Also, should be taken is also regularly to inspect the ducting cleanness for the internal of ducting and control the dust flow rate through the scrubbing system. As conclusion, the suggestions given are to mitigate the risk of corrosion impact by maintaini­­­­­­ng ducting strength within the minimizing ducting system failures and ensuring the NPK plant's operation reliability.
PENGARUH PERBEDAAN JENIS ELEKTROLIT DAN KONSENTRASI TERHADAP SINTESIS GRAPHENE SECARA ELEKTROKIMIA MENGGUNAKAN REAKTOR SOLENOIDA Isnanda Nuriskasari; Devi Handaya; Adila Syifa Prayogi; In In Mustopa; Tania Sonya Sihombing; Mochammad Tendi Noer Ramadhan
AUSTENIT Vol. 15 No. 1 (2023): AUSTENIT: April 2023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53893/austenit.v15i1.6270

Abstract

Electrochemical synthesis of graphene is a way to obtain graphene. Graphene as a material that has thermal, magnetic, mechanical, chemical properties, especially in special electrical properties. The development of graphene lies in the method used, one of which is the electrochemical method, where this method has the advantages of being fast, environmentally friendly, and low cost in the production process. In the process, this method requires several main components, namely electrolytes, electrodes, and an electrical supply. The electrolytes used are still very diverse and the search for the right electrolyte continues to increase the production of graphene synthesis. This study focuses on knowing the effect of the Sulfuric Acid (H2SO4), Hydrochloric Acid (HCl), and Vinegar Acid (CH3COOH) as electrolytes in electrochemically obtaining graphene and the effect of electrolyte concentration (0.5M; 1M; and 1.5M). The fixed variable used is commercial graphite with the reactor used is a solenoid modified reactor with a reaction time of 1 hour. The result is that the electrolyte H2SO4 is a very good type of electrolyte in the graphene synthesis process compared to HCl and CH3COOH, it can be seen from a graph containing data in the form of graphite weight after the electrochemical graphene synthesis process, and the greater the concentration, the stronger the electrolyte in the graphene synthesis process, so that more graphite will be eroded and more graphene will be obtained.
Coverage Vol. 15 No. 1 Editorial .
AUSTENIT Vol. 15 No. 1 (2023): AUSTENIT: April 2023
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Austenit is a peer-reviewed journal that is regularly published twice times (April and October) a year by Mechanical Engineering Department of Politeknik Negeri Sriwijaya and managed by an experienced editorial board coming from universities in Indonesia and overseas partners. This journal is a highly quality to bridge the results of applied and vocational research in the form of scientific works which have never been published in the other media. The works are in the field of mechanical engineering which includes product design and engineering, energy conversion, metallurgy engineering and sciences, construction, mechanical maintenance and repair, renewable energy and sustainability, and mechanization-control. There are ten articles in this Vol.15 No.1 edition issue written by researchers and Industry expert practitioners from VietNam and Indonesia. The VietNam researchers from Dong Nai Technology University. The Indonesian researchers from Universitas Sriwijaya, Politeknik Astra, Universitas Tridinanti Palembang, Politeknik Negeri Jakarta and Politeknik Negeri Sriwijaya as well Industry Expert from PT. Pusri Palembang. Each article has been selected by the editorial team and passed the single-blind review stage by highly qualified reviewers.

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