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All Journal Rekayasa Mesin International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Mechanical Engineering for Society and Industry
Darmadi, Djarot Bangun
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Rekayasa Sistem Informasi Manajemen Perawatan Mesin Perkakas di Laboratorium Proses Manufaktur Jurusan Teknik Mesin Universitas Brawijaya Rusdin, Rusdin; Santoso, Purnomo Budi; Darmadi, Djarot Bangun
Rekayasa Mesin Vol 9, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (582.685 KB) | DOI: 10.21776/ub.jrm.2018.009.02.7

Abstract

Manufacturing Process Laboratory of Mechanical Engineering of University Brawijaya still applies the manual system in carrying out preventive maintenance. This has caused delays of action for machine maintenance and difficulties encountered by the manager or head of the laboratory with accessing to data on preventive maintenance matters to obtain the required information. Besides, there has been no encoding on the machines, components, and spare parts so that the search for information on the machines and spare parts took a long time. Therefore, a Maintenance Management Information System, which integrates Database science, Preventive maintenance, and machine tools, was created where the steps included developing the prototype. The instrument used in creating the information system was Microsoft Access 2016. Based on the testing results, the Maintenance Management Information System could generate report recaps, daily reports, warnings of available spare parts stocks, and tools and search menu. Accordingly, the information system could meaningfully assist the head of the laboratory in managing the maintenance of machines.
Tensile Strength and Macro-microstructures of A6061 CDFW Weld Joint Influenced by Pressure and Holding Time in the Upset Stage Abdulla, Farg Abdulla M; Irawan, Yudy Surya; Darmadi, Djarot Bangun
Jurnal Rekayasa Mesin Vol 9, No 2 (2018)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (436.905 KB) | DOI: 10.21776/ub.jrm.2018.009.02.12

Abstract

This paper aims to analyze the effect of pressure and holding time in the upset stage on tensile strength and macro-microstructures of continuous drive friction welded (CDFW) joints of aluminum alloys A6061. Friction weld specimens were welded using variations of upset pressure (40, 80, 120 MPa). The upset holding time was varied from 3, 10, to 20 seconds. Tensile strength test was conducted based on the AWS standard. The result showed that the higher upset pressure and the longer holding time in the upset stage are able to reduce the porosity of the CDFW weld joint and cause a higher tensile strength of the specimens. Meanwhile, from macro-mic restructures observation results, it was found that the specimen with maximum tensile strength has a wider partly deformed area (ZPD) and finer grains in the center of the specimen longitudinal section compared to those of the specimens with minimum tensile strength. It was occurred due to plastic deformation as the result of the higher pressure and the longer holding time in the upset stage. Fracture surface observation results indicate that in the specimen with a higher upset pressure and a longer holding time, has inflated fracture surface and the fracture zone exists in the heat affected zone, not in the interface like that of the specimen with lower tensile strength due to the lower upset pressure and the shorter holding time.
Tegangan Ambang pada Sambungan Las CDW antara Baja dan Kuningan dalam Lingkungan Korosif Lobo, Osmar Buntu; Darmadi, Djarot Bangun; Novareza, Oyong
Jurnal Rekayasa Mesin Vol 11, No 1 (2020)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jrm.2020.011.01.15

Abstract

Failure at the welded joint can be occurs due to the Stress Corrosion Cracking (SCC) phenomenon. Dissimilar welding is more susceptible to SCC when compared to similar welding. This can be occurs because the material or metal that connected is non-homogeneous material. which causes the material will be difficult to be combined perfectly. This study aims to determine the threshold stress (σTh) at the dissimilar welded joint between steel and brass which have SCC loads. Both materials were connected by the welding method by using a Capacitive Discharge Welding (CDW) welding machine. Surface preparation or surface treatment is applied to one of the basic materials (low carbon steel) to obtain optimal joint results. The welded joint was tested by using Constant Load Test (CLT) methods, which is engineered in such a way that the welded joint get the stress,  corrosive environment (1M NHO3 solutions) and voids produced by the weld joint itself. The result shows that the threshold stress of the dissimilar welding joint between steel and brass by the CDW method is 330 MPa.
PENGARUH PENGGUNAAN MINYAK JAGUNG UNTUK CUTTING FLUID PADA PROSES FACE MILLING TERHADAP KEKASARAN PERMUKAAN PERMUKAAN DAN LAJU KOROSI BAJA KARBON Widodo, Teguh Dwi; Suwarso, Wahyu Handoyo; Wahyudiono, Arif; Raharjo, Rudianto; Bintarto, Redi; Sasongko, Mega Nur; Darmadi, Djarot Bangun; Setiawan, Yustiza Rahadian
Jurnal Rekayasa Mesin Vol. 14 No. 3 (2023)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v14i3.1627

Abstract

The corrosive coastal environment will result in a high corrosion rate for any equipment installed there. This is due to the constant exposure to saltwater, high humidity levels, and strong winds. Therefore, it is crucial to use corrosion-resistant materials and regularly maintain the equipment to ensure its longevity in such an environment. One method to reduce the rate of corrosion is to pay close attention to the manufacturing parameters of these components, one of which is the face milling process. The aim of this study is investigating the effect of face milling process with different dept of cut using minimum quantity lubrication method with corn oil as a renewable vegetable cutting fluid. In this study AISI 316L stainless steel was face milled using HAAS VF-2 CNC machine. The depth of cut is varied between 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, and 0.6 mm. The results demonstrated that the greater the depth of cut, the greater the surface roughness value that will be generated. It is resulting in increment in the corrosion rate value.
OPTIMIZATION OF MAINTENANCE PERIOD FOR OIL AND GAS PRODUCTION EQUIPMENT WELLS IN TUBAN EAST JAVA FIELD USING MGR AND BERNARD’S APPROACHES Yahya, Indra Nur; Darmadi, Djarot Bangun; Setiawan, Ari; Pratama, Rizki R
International Journal of Mechanical Engineering Technologies and Applications Vol. 5 No. 2 (2024)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2024.005.02.5

Abstract

Mechanical failures can cause Electric Submersible Pump (ESP) disruptions, shortening their lifespan. Despite improvements in run-time, unexpected failures still result in significant production deferment and loss, especially for oil & gas production equipment in Tuban East Java (TEJ) field. Therefore, we used Reliability Centered Maintenance (RCM) to analyze FMEA, employing two methods: Montgomery and Runger's (MGR) and Bernard's approaches. The MGR approach provided a better prediction of the failure rate. The ESP flat cable has the highest RPN, requiring maintenance of US$59,342 for an ideal 509-day period.
MODIFICATION OF WOVEN DENDROCALAMUS ASPER IN COMPOSITE APPLICATIONS Raharjo, Rudianto; Darmadi, Djarot Bangun; Gapsari, Femiana; Setyarini, Putu Hadi; Alamsyah, Fikrul Akbar
International Journal of Mechanical Engineering Technologies and Applications Vol. 5 No. 2 (2024)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2024.005.02.6

Abstract

The aim of this study is to examine the influence of immersing Petung Bamboo in a NaOH solution on the tensile strength (TS) of composites containing an epoxy matrix. Petung Bamboo Webbing was given 0%, 3%, 6% and 9%, soaking treatment. The Composite utilised in this investigation was fabricated by the Vacuum Assisted Resin Infusion technique. Tensile testing of composites is conducted according to the ASTM D638-1 standard. The findings indicated a positive correlation between the concentration of NaOH immersion and the adhesion between the woven surface of Petung Bamboo and the matrix. Consequently, the TS of the Composite was enhanced. However, increasing the concentrations beyond a certain point leads to more degradation of the lignin and cellulose in the fibers, resulting in a loss in the strength of the composite. The Petung Bamboo woven reinforced Composite achieved the highest TS of 136.06 MPa after being treated with a 6% NaOH immersion. This was followed by a 3% NaOH immersion treatment resulting in a TS of 106.04 MPa. Without any NaOH immersion treatment, the composite had a TS of 97.31 MPa. The lowest TS of the composite was observed after a 9% NaOH immersion treatment, measuring 90.79 MPa. The Petung Bamboo wicker-reinforced composite with NaOH immersion treatment showed higher fiber pullout and fiber-matrix debonding failures, while higher NaOH treatment concentration reduced these failures.
Optimized deposition parameters for titanium nitride coatings: Enhancing mechanical properties of Al 6011 substrates via DC sputtering Margono, Margono; Darmadi, Djarot Bangun; Gapsari, Femiana; Widodo, Teguh Dwi; Kozin, Muhammad; Puranto, Prabowo; Kamil, Muhammad Prisla; Fitriani, Diah Ayu; Azahra, Siti Amalina; Andriyanti, Wiwien
Mechanical Engineering for Society and Industry Vol 4 No 2 (2024)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.12266

Abstract

The growing demand for advanced coatings in industries such as aerospace and automotive necessitates materials with superior hardness, wear resistance, and thermal stability. Despite advancements in ternary coatings, research on binary Titanium Nitride (TiN) coatings remains limited, particularly in optimizing deposition parameters for lightweight aluminum substrates. This study aims to investigate the effects of sputtering parameters, specifically Ar:N₂ gas ratios and deposition durations, on the mechanical properties of TiN coatings on Al 6011 substrates. The optimized conditions (70Ar:30N₂ gas ratio and 60-minute deposition) yielded a 165% increase in surface hardness (88.92 HV) and a 54% reduction in wear rate compared to untreated samples. XRD and SEM analyses confirmed the dense microstructure and strong (200) phase orientation contributing to these enhancements. This research highlights a cost-effective and scalable approach to improving the performance of aluminum alloys, bridging the gap between fundamental studies and industrial applications.
The stress corrosion cracking (SCC) susceptibility of the dissimilar ASTM A36 steels and 316L stainless steels welding in varied temperature of FeCl2 Darmadi, Djarot Bangun; Saputra, Angga; Utomo, Slamet Prasetyo; Talice, Marco
Mechanical Engineering for Society and Industry Vol 5 No 1 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.13161

Abstract

Obtaining perfect dissimilar welding joints, which are exposed to corrosive environments still a problem up to now. The ASTM A36 and 316L stainless steels, dissimilar metals, were joined using Capacitive Discharge Welding (CDW). The welding parameters, such as distance between metals, pressure, applied energy, and surface parameters, were kept constant. The FeCl2 corrosive solution concentration was also kept constant at 0.5M. The temperature of the solution was controlled at varied temperatures, those are: 30 °C, 40 °C, and 50 °C, respectively. The resistance to the Stress Corrosion Cracking (SCC) load was evaluated by time to fracture for certain dead tensile loads and corrosive media. The SEM EDS data were retrieved to have a deep insight into the SCC mechanism. The results show that, with a 10 °C increase in temperature, the SCC Threshold is decreased by 40% which is supported by the data of time to failure for certain loads and also the SEM EDS.
Co-Authors Abdulla, Farg Abdulla M Angga Saputra Ari Setiawan Arif Wahyudiono Azahra, Siti Amalina Diah Ayu Fitriani, Diah Ayu Femiana Gapsari MF Fikrul Akbar Alamsyah Heni Pujiastuti Kamil, Muhammad Prisla Kozin, Muhammad Lobo, Osmar Buntu Margono Margono Mega Nur Sasongko Oyong Novareza Prabowo Puranto Pratama, Rizki R Purnomo Budi Santoso Putu Hadi Setyarini Redi Bintarto, Redi Rudianto Raharjo Rusdin Rusdin Setiawan, Yustiza Rahadian Suwarso, Wahyu Handoyo Talice, Marco Teguh Dwi Widodo Utomo, Slamet Prasetyo WIWIEN ANDRIYANTI Yahya, Indra Nur Yudy Surya Irawan