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All Journal JPSE (Journal of Physical Science and Engineering) Emerging Science Journal Civil Engineering Journal Mekanika: Majalah Ilmiah Mekanika Research in Education, Technology, and Multiculture
Aditya Rio Prabowo
Department Of Mechanical Engineering, Universitas Sebelas Maret, Surakarta 51276,
Astronomy Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Environmental Science Materials Science & Nanotechnology Physics

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Sintesis Ferrat sebagai Pendegradasi Senyawa Turunan Benzena Dian Majid; Aditya Rio Prabowo; Muhammad Al Kholif; Sugito Sugito
JPSE (Journal of Physical Science and Engineering) Vol 3, No 2 (2018): JPSE (Journal of Physical Science and Engineering)
Publisher : Universitas Negeri Malang

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Abstract

Penelitian ini dilakukan dengan tujuan untuk mensintesis kalium ferrat (K2FeO4) dengan menggunakan berbagai sumber Fe dan diaplikasikan pada pendegradasian senyawa turunan benzene seperti klorobenzena, bromobenzena dan toluene. Pada penelitian ini telah berhasil mensintesis dengan mengunakan 4 sumber Fe yang berbeda diantaranya FeSO4.9H2O, FeCl2.9H2O, Fe(NO3)2.9H2O, dan NaFeO2. Masing masing kristal kalium ferrat hasil sintesis berwarna hitam keunguan. Pada analisa menggunakan spektrofotometer UV-Vis, ferrate memiliki panjang gelombang pada 510nm. Sintesis kalium ferrat menggunakan NaFeO2 memiliki tingkat kemurnian yang paling tinggi. Pada hasil uji degradasi, efisiensi tertinggi didapatkan pada degradasi toluene sebesar 53% hanya dalam 10 menit waktu reaksi. Hal ini menunjukan bahwa kalium ferrat merupakan bahan alternatif yang menjajikan dalam pengolahan air maupun limbah industri. DOI: http://dx.doi.org/10.17977/um024v3i22018p070
Investigation of Honeycomb Sandwich Panel Structure using Aluminum Alloy (AL6XN) Material under Blast Loading Dany Taufiq Alim Ansori; Aditya Rio Prabowo; Teguh Muttaqie; Nurul Muhayat; Fajar Budi Laksono; D. D. Dwi Pria Tjahjana; Ari Prasetyo; Yemi Kuswardi
Civil Engineering Journal Vol 8, No 5 (2022): May
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2022-08-05-014

Abstract

In this study, we focused on the large inelastic behavior of a sandwich panel made of two solid plates as a stiffener and a honeycomb core shell subjected to blast load. The loading scheme was carried out using an explosive charge bullet mounted at a standoff distance of 100 mm with three mass variations of trinitrotoluene: 1, 2, and 3 kg TNT. The numerical simulations performed using ABAQUS/CAE were validated with the experimental results of a previous study. The geometrical effects of the sandwich panel on intact and damaged models were also numerically investigated. The panel was designed using a square and hexagonal honeycomb core. The effect of honeycomb core height was also observed by modeling the core using three height variations: 31, 51, and 71 mm. The results showed that the hexagonal core was more resistant to blast loads than the square design. The core height parameter determines the energy absorption based on these results. The structural strength is also affected by the damage. The findings of this study can be used to improve structural designs that utilize sandwich panels to withstand blast loads. Doi: 10.28991/CEJ-2022-08-05-014 Full Text: PDF
Forecasting the Effects of Failure Criteria in Assessing Ship Structural Damage Modes Aditya Rio Prabowo; R. Ridwan; T. Tuswan; Fitrian Imaduddin
Civil Engineering Journal Vol 8, No 10 (2022): October
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2022-08-10-03

Abstract

The failure to achieve satisfactory results will cause immense losses in major projects. Nevertheless, the modeling limitations and phenomenon assumptions represented by failure criteria can significantly influence the final results—e.g., the damage mode, affecting its quantification—thus representing an interesting topic for technical assessment. This work aims to forecast the effects of several failure criteria on the damage occurring due to structural loading schemes, such as compression, torsion, and tensile tests. Failure criteria are taken based on the proposal of pioneer researchers and include those of Peschmann (P), Germanischer Lloyd (GL), Liu (LIU), and Rice–Tracey and Cockroft–Latham (RTCL). A series of nonlinear finite element analyses (NLFEA) are conducted by inputting these criteria into different loading schemes. To obtain reliable validation, the proposed models are designed based on previous laboratory experiments. The numerical results of NLFEA in the forms of damage mode, i.e., tearing, plastic deformation, and torsion, are cross-checked with experimental data. The results show that numerical modeling using the LIU criterion produces slightly larger discrepancies compared with experimental data. This indication is founded on the analysis of stress–strain, load–displacement, and shear stress–strain during the tensile test, compressive load, and torsion load, respectively. According to this work, we formulate recommendations based on the forecast tendency and accuracy for each damage mode subjected to failure criteria. Therefore, future works can adopt the findings in our current work when choosing to apply specific criteria in structural modeling and load idealization. Doi: 10.28991/CEJ-2022-08-10-03 Full Text: PDF
Effects of Stir Casting Baffles on Hardness and Microstructure: Investigation of Designed Aluminum Composites Eko Surojo; Hammar Ilham Akbar; Dody Ariawan; Aditya Rio Prabowo; Teguh Triyono; Fahmi Imanullah
Civil Engineering Journal Vol 8, No 8 (2022): August
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2022-08-08-04

Abstract

The increasing demand for lightweight material specifications has forced researchers to develop lightweight materials that are inexpensive, can be produced on a large scale, and are environmentally friendly. One solution that has been developed is an aluminum composite reinforced with sea sand. Indonesia has the second longest coastline in the world, which means that the country is rich in maritime resources, one of which is sea sand. The ceramic contents of SiO2, SiC, and Al2O3allow sea sand to be used as a reinforcement in aluminum composites for engineering purposes. The most effective manufacturing method of AA6061–sea sand composites is stir casting, but the homogeneity and distribution of particles are the main disadvantages of the stir casting method. Various factors affect particle distribution and homogeneity, one of which is the flow during the stirring process. The increase in turbulent flow in the stirring process affects the homogeneity and distribution of the particles. One way to create a turbulent flow when stirring is to add baffles. This paper examines the effect of adding baffles during the stir casting process on the mechanical properties of AA6061–sea sand composites. The mechanical properties of AA6061–sea sand composites were characterized using the Brinell hardness test according to ASTM E-10. The test results show that the addition of baffles during the stir casting process decreases the hardness of the AA6061–sea sand composites due to the turbulent flow that occurs. This makes the material more porous, which makes the AA6061–sea sand composites less hard. Doi: 10.28991/CEJ-2022-08-08-04 Full Text: PDF
Tribological Performance of Polymer Composite Modified with Calcined Eggshell Particles Post High-Temperature Exposure Sunardi Sunardi; Dody Ariawan; Eko Surojo; Aditya Rio Prabowo; Tohid Ghanbari-Ghazijahani; Cahyo Hadi Wibowo; Hammar Ilham Akbar
Emerging Science Journal Vol 8, No 4 (2024): August
Publisher : Ital Publication

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/ESJ-2024-08-04-03

Abstract

During operation, brake lining material rubs against the disc to generate heat. This heat could decrease the brake lining performance, such as the friction coefficient, specific wear rate, and interface temperature of the rubbing surfaces. The resulting wear debris is environmentally harmful and poses risks to human health. Therefore, this study aimed to replace the harmful material using eggshell particles as a filler in brake lining composite and enhance tribological properties. The brake lining samples were manufactured through three stages: cold compaction, hot compaction, and post-curing. The next step is the samples were subjected to a one-hour high-temperature exposure at 200°C, 300°C, 400°C, and 500°C. The results showed that the high-temperature exposure significantly affected the specific wear rate, friction coefficient, and interface temperature between the brake lining and disc. An interesting finding was that adding calcined eggshell particles in composite could improve the tribological properties up to 400°C. However, the best material’s performance resulted when the samples got an exposure temperature of 200°C. Doi: 10.28991/ESJ-2024-08-04-03 Full Text: PDF
Load Capacity and Bending Strength of Double-Acting Friction Stir Welded AA6061 Hollow Panels Nurul Muhayat; Muhammad Budi Utama; Ericha Dwi Wahyu Syah Putri; Eko Prasetya Budiana; Aditya Rio Prabowo; Yohanes P. D. S. Depari; . Triyono
Civil Engineering Journal Vol 10, No 8 (2024): August
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2024-010-08-018

Abstract

Aluminum alloy hollow panels are essential components in both civil and mechanical structures, such as building floors or large vehicle platforms. They enhance rigidity while staying lightweight and conserving material volume. In its application, this panel must be joined using welding methods. One common issue encountered in aluminum welding is the formation of porosity defects. Solid-state welding methods like Friction Stir Welding (FSW) can be a solution to address this problem. The FSW joining process on hollow panels cannot be completed in one welding operation due to their thickness. The FSW process must be performed on both surfaces, which requires a relatively long time. Therefore, FSW needs to be developed into a Double-acting FSW that utilizes two tools simultaneously. These two tools introduce two sources of heat input, pressing force, and friction-stirring, resulting in a novel response that needs further research. This study delves into the impact of welding speed variations in Double-Acting FSW on the load capacity and bending strength of AA 6061 hollow panel joints. Welding speeds of 20, 30, and 40 mm/min were tested alongside rotational speed (1500 rpm), tilt angle (2°), and shoulder diameter (24 mm). It was discovered that reducing welding speed enhances both load capacity and bending strength. Notably, specimens welded at 20 mm/min exhibited a load capacity of 15.61 kN and bending strength of 52 MPa, highlighting the potential of slower speeds for superior weld performance. Doi: 10.28991/CEJ-2024-010-08-018 Full Text: PDF
Design of the Bengawan Unmanned Vehicle (UV) Roboboat: Mandakini Neo Haris Nubli; Fahri Setyo Utomo; Hananta Diatmaja; Aditya Rio Prabowo; Ubaidillah Ubaidillah; Didik Djoko Susilo; Wibowo Wibowo; Teguh Muttaqie; Fajar Budi Laksono
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 2 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i2.61624

Abstract

Mandakini Neo was made with the ship's capacity, speed, and comfort in mind, as well as the ship's hydrodynamic performance and construction cost. Therefore, the method used to determine the hydrostatic characteristics is through a simulation consisting of a resistance test, stability test, maneuver test, and seakeeping test. The simulation uses Maxsurf software with the Savitsky method, which is then processed by data. Global Positioning System (GPS) and ultrasonic sensor tests were also conducted. Based on the simulation results, the stability of the Mandakini Neo ship has a GZ value of 0.1417 m with an angle of 30°, which follows the standards of the International Maritime Organization (IMO). In testing, the maneuvers obtained have met IMO standards based on tactical and advanced diameters. Based on the seakeeping test, when the speed is 5 knots, the heave movement has the same magnitude for all wave headings, 0.0096 m. while the most considerable rolling motion is in the wave direction of 135°, which is 0.36 m, and the most considerable pitch motion is in the direction of the 180° wave, which is 0.042 m. At a speed of 10 knots, the heave motion produced is the same as for all wave headings.
Failure Criteria in Crashworthiness Analysis of Ship Collision and Grounding Using FEA: Milestone and Development Hermes Carvalho; Ridwan Ridwan; Sudarno Sudarno; Aditya Rio Prabowo; Dong Myung Bae; Nurul Huda
Mekanika: Majalah Ilmiah Mekanika Vol 22, No 1 (2023): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v22i1.70959

Abstract

This study presents reviews of the failure criteria to capture the resulting response due to the catastrophe of ship collision and grounding using the finite element. Researchers have introduced several failure criteria, for instance, the Det Norske Veritas (DNV) RP-C204 criterion, Germanischer Lloyd criterion, Peschmann, Rice-Tracey and Cockcroft-Latham (RTCL), Bressan-Williams-Hill (BWH) instability criterion, and Liu criterion. As in the mathematical formula, each criterion has a difference. The choice of failure criteria will depend on the simulation's specific requirements and the analysis's goals. Liu's criterion can be used to evaluate the failure of materials in ship collision simulations, for example, when large element sizes (i.e., 20 mm) are considered in the simulation.
Steady RANS Assessment of Stall Fence Effects on Wells Turbine Performance for Oscillating Water Column Systems Muhammad Nurfajriansyah Muslich; Aditya Rio Prabowo; Ristiyanto Adiputra; Seung Jun Baek; Svitlana Onyshchenko; Mahfud Alfajar; Dominicus Danardono Dwi Prija Tjahjana; Iwan Istanto; Rahman Wijaya; Hermes Carvalho
Research in Education, Technology, and Multiculture Vol 5, No 3 (2026): Research in Education, Technology, and Multiculture
Publisher : Institute of Multidisciplinary Research and Community Service

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61436/rietm/v5i3.pp222-238

Abstract

The Wells turbine is a key component in an Oscillating Water Column (OWC)-based ocean wave energy conversion system, yet its limited operating range due to leading-edge stall constrains overall system efficiency. This study presents an independent CFD benchmark of the performance of the Wells turbine with and without a passive flow control device, a stall fence, as investigated by Das and Samad (2020). Steady Reynolds-Averaged Navier-Stokes (RANS) simulations using the SST k-ω turbulence model were performed in ANSYS CFX v22.1 by replicating the original geometry, boundary conditions, and mesh density for direct comparison. The reference turbine (eight NACA 0015 blades, solidity 0.64) and the configuration with a stall fence (fences at 40% and 80% span) were evaluated over a flow coefficient range of φ = 0.075-0.275. Grid independence study using quantitative (non-dimensional torque T*) and qualitative (tip-vortex topology) criteria resulted in the selection of a 3.5-million-element mesh. For the reference turbine, a mean absolute percentage error (MAPE) of 2.0% for T* and 3.1% for efficiency was obtained in the pre-stall range (φ ≤ 0.225), confirming strong numerical reproducibility. However, steady RANS failed to predict the stall onset for the reference configurations and overpredicted torque by up to 508% in the post-stall region. The stall point at φ = 0.250 was successfully reproduced with a deviation approaching zero, proving that the vorticity induced by the fence geometry enhances the reliability of RANS stall predictions. The pre-stall MAPE for the fence configuration was 4.4% for T*, slightly higher due to local vortex interactions around the fence. These findings establish steady RANS as a reliable design tool in the pre-stall range and demonstrate that passive fence stalls not only extend the turbine’s operating range but also improve the accuracy of CFD predictions. Keywords: Wells turbine, Stall fence, CFD benchmark, Steady RANS, Ocean wave energy conversion.
Co-Authors . Triyono Ari Prasetyo Cahyo Hadi Wibowo D. D. Dwi Pria Tjahjana Danardono Dwi Prija Tjahjana, Dominicus Dany Taufiq Alim Ansori Dian Majid Didik Djoko Susilo Dimas Wahyu Utomo Dody Ariawan Dong Myung Bae Eko Prasetya Budiana Eko Surojo Eko Surojo Ericha Dwi Wahyu Syah Putri Fahmi Imanullah Fahri Setyo Utomo Fajar Budi Laksono Fajar Budi Laksono Fitrian Imaduddin Hammar Ilham Akbar Hananta Diatmaja Haris Nubli Hermes Carvalho Hermes Carvalho Iwan Istanto Kuswardi, Yemi Mahfud Alfajar Muhammad Al Kholif Muhammad Nurfajriansyah Muslich Muhayat, Nurul Nurul Huda Nurwijayanti R. Ridwan Rahman Wijaya Ristiyanto Adiputra Rumi Iqbal Doewes, Rumi Iqbal Seung Jun Baek Sudarno Sudarno Sugito Sunardi Sunardi Svitlana Onyshchenko T. Tuswan Teguh Muttaqie Teguh Muttaqie Teguh Triyono Tohid Ghanbari-Ghazijahani Ubaidillah Ubaidillah Wibowo Wibowo Yohanes P. D. S. Depari