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Jaka Fajar Fatriansyah
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Journal of Materials Exploration and Findings
Published by Universitas Indonesia
ISSN : -     EISSN : 29625475     DOI : https://doi.org/10.7454/jmef
Core Subject :
JMEF publishes publications that report on R&D discoveries and fundamental understanding of phenomena with potential significance, as well as those that explore solutions to current engineering challenges in materials and mechanical engineering or related fields. JMEF includes original research, review and short communication articles. JMEF welcomes original articles on all aspects of materials science/engineering and mechanical engineering, including: 1. Materials synthesis, processing and manufacturing; 2. Advanced Materials; 3. Extraction metallurgy; 4. Physics of Materials; 5. Computational studies on Materials and Mechanical Engineering; 6. Fluid Dynamics and Heat Transfer; 7. Management Integrity and Reliability Engineering; 8. Mechanical systems; and related fields.
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Articles 6 Documents
 1 
Search results for , issue "Vol. 1, No. 3" : 6 Documents clear
The Effect of Graphite and Activated Carbon as Dispersed Particle in Base Fluid as Quench Medium on the Hardness of S45C Carbon Steel Putra, Wahyuaji Narottama; Somadinata, Danika Aprilia; Ramahdita, Ghiska
Journal of Materials Exploration and Findings Vol. 1, No. 3
Publisher : UI Scholars Hub

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Abstract

Adding a solid particle dispersion into a base fluid could increase its thermal conductivity, hence increasing the heat transfer characteristics. One example of this thermally enhanced fluid is in heat treatment industry as quench medium. By controlling the amount of the dispersed particle, the cooling rate of the quench medium can be altered, and could affect steel hardness after heat treatment. In this research, the dispersed particle used was commercially available graphite and activated carbon particle. As for the base fluid, distilled water and common engine oil were compared. The concentration of the dispersed particle was 0.1, 0.3, 0.5 weight percent. The highest hardness was achieved at 728 HV on the 0.1% activated carbon particle in water base fluid. Meanwhile, by using graphite, the highest hardness achieved was at 639 HV on the 0.1% particle in water base fluid. The result may suggest that activated carbon could improve the cooling rate better due to its impurities. As expected, quenching by dispersed graphite particle in oil based resulted in lower hardness on all variables.
Development of Battery Materials to Function as Corrosion Protection on Car Body Plates Rohmannudin, Tubagus Noor; Sulistijono, Sulistijono; Adrinanda, Noval; Dharma, Faridz Wira; Areliano, Samuel
Journal of Materials Exploration and Findings Vol. 1, No. 3
Publisher : UI Scholars Hub

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Abstract

Most car bodies made for mass production are made from steel or aluminum. Both are strong metals, but steel is cheaper than aluminum and is more commonly used in lower-end cars for a broader consumer range. The weakness of steel compared to aluminum is that it is susceptible to corrosion under certain conditions, and thus it may deteriorate over time without proper care. To prevent corrosion, modern cars are coated with paint to prevent direct contact with the environment. As a second line of protection, a car battery can be connected to the body to create an impressed current cathodic protection circuit. In this study, a steel sample from the car body is connected to an ICCP or impressed current cathodic protection circuit with a small 12v battery and a graphite anode. The specimen's paint layers are removed through grinding and tested in water, wet soil, and open air. The specimens in water and wet soil experienced minimum corrosion during the testing period, while the ones in open air experienced significant corrosion products on the surface. Overall, due to the small specimen size compared to battery output, all specimens experience a case of overprotection of up to -5516 mv in wet soil and -2666 mv in water. Due to limitations, we are unable to do proper measurements in the open-air environment.
Effect of Austenization and Repeated Quenching on The Microstructures and Mechanical Properties of Wear-Resistant Steel Nugraha, Yanuar; Mochtar, Myrna Ariati
Journal of Materials Exploration and Findings Vol. 1, No. 3
Publisher : UI Scholars Hub

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Abstract

This study was focused on determining the effect of repeated austenitization and quenching on mechanical properties and microstructure. The experiment was carried out in a rolled quencher facility with a heat treatment process of one to two times, with parameters of an austenizing temperature of 9500C and quenching at a temperature of 8500C with pressurized water media. Testing of specimens, including microstructure observations and hardness testing. The repeated heat treatment process showed an increase in hardness of 0.79% on one-time repeated heat treatment and 1.65% on two repeated heat treatments. This occurs due to the presence accompanied by refinement of the prior austenite grains and the martensite structure. In addition, the hardness value decreases in the surface area 17.9 HV and 24.9 HV due to the deeper accumulation of decarburization 0.06-0.10 mm followed by thicker iron oxide growth 0.04-0.07mm.
Potential of Biduri Fiber (Calotropis gigantea) as Material for Oil Spill Absorbent Sukmawati, Anne; Septiani, Wulan
Journal of Materials Exploration and Findings Vol. 1, No. 3
Publisher : UI Scholars Hub

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Abstract

Biduri fiber (Calotropis gigantea) is a natural hollow fiber with hydrophobic and oleophilic properties potentially used as oil spilled sorbent from seawater. This study aims to determine the absorption capacity and efficiency of the Biduri fiber and membrane to fuel oil. Measurement of oil absorption to seawater was carried out at various fiber weights (0.5-1.5 g), fiber composition (50-95%), contact time (10-90 minutes), temperature (30 and 50°C), and compared with commercial products. The results showed that the fiber weight variation of 0.5-1.5 g has an average absorption efficiency of 96.67%, and the highest absorption was obtained in a weight of 0.5 g, a density of 0.0143 g/cm3, 43.79 g/g. In the membrane composition of 50-95%, the absorption efficiency of 96.98%, and the highest absorption capacity of the membranes was 95%, density of 0.0259 g/cm3 and 44.62 g/g. The absorption capacity and efficiency of Biduri fiber and membrane are higher than commercial products.
Freespan Analysis for Subsea Pipeline Integrity Management Strategy Hadi, Nurul; Helmi, Muhammad; Cathaputra, Edo; Priadi, Dedi; Dhaneswara, Donanta
Journal of Materials Exploration and Findings Vol. 1, No. 3
Publisher : UI Scholars Hub

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Abstract

Abstract. Over a rough seabed or on seabed subject to scour, freespans can occur when contact between a subsea pipeline and the seabed is lost over an acceptable distance. When this exceeds the allowable freespan length, design stresses can be exceeded, and a vortex induced vibration (VIV) response can be initiated, resulting in the risk of fatigue failure. If this is not predicted and controlled properly, it will affect pipeline integrity, leading to expensive rectification and intervention work. Freespan analysis consisted primarily of a screening check in which the as-found freespans from Remotely Operated Vehicle (ROV) or multibeam Side Scan Sonar (SSS) inspection survey were compared against the design allowable lengths and determine the expected fatigue life of a freespan that may be experiencing Vortex Induced Vibration (VIV). Freespans are considered acceptable if the calculated fatigue life exceeds the design life criteria. This paper describes the freespan analysis that has been developed to perform detailed freespan engineering assessments, incorporating the latest survey and as-laid conditions. This analysis follows a methodology in standard code DNVGL RP F105 that has been accepted and used by operators to produce more accurate and less conservative freespan analysis results, leading to a subsea pipeline integrity management strategy with fewer unnecessary interventions and greater cost benefits.
Structural Integrity Analysis of the Rig Mast Following Repair of Two Diagonal Braces in the Upper Mast Section Padmodwiputra, Rendhatya; Soedarsono, Johny Wahyuadi; Mahendra, Mirza; Satria, Bambang Eka; Arif, Chandra; Suarthana, Eka Juni
Journal of Materials Exploration and Findings Vol. 1, No. 3
Publisher : UI Scholars Hub

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Abstract

During a move to the new drilling location, two braces of the upper mast section on a 550 HP oil and gas rig was damaged. When damage is discovered, the rig operating company should conduct a risk analysis related to the damage using the standard used to determine rejection criteria and follow-up repairs. The strength of the rig mast is calculated using Finite Element Analysis (FEA) with initial conditions (before damage occurs) where all braces are installed and extreme conditions where neither brace is repaired. The calculation results are then used to assess the risk of reducing the rig mast strength. The results of the integrity analysis will show FEA of rig mast and the distribution pattern of stress ratio values, which is the ratio between the stress that arises and the allowable stress of the material on the mast parts due to loading.

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