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Mekanika: Majalah Ilmiah Mekanika
Published by Universitas Sebelas Maret
ISSN : 14127962     EISSN : 25793144     DOI : https://doi.org/10.20961/mekanika
Core Subject :
"Mekanika: Majalah Ilmiah Mekanika" is an open-access journal published by Mechanical Engineering Study Program, Faculty of Engineering, Universitas Sebelas Maret. Mekanika invites scholars, researchers and practioners who have interest in mechanical engineering to publish their articles and also provides forums for them to share their works and knowledge. Mekanika focuses on the area of materials engineering and science, design, energy, manufacturing and construction but is not limited to. Both English and Bahasa are accepted in this journal. Mekanika has two issues every year (March and September) and aims to publish more frequently in the future.
Arjuna Subject : Teknik (semua kategori) - Teknik Mesin
Articles 75 Documents
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Masonry Wall Performance Estimation Under Blast Loading: A Study Using Finite Element Analysis Fitri, Siti Nurlita; Mubarok, Muhammad Arif Husni; Hamadi, Halim; Do, Quang Thang; Pratama, Afiq Azfar; Rommy, Rommy
Mekanika: Majalah Ilmiah Mekanika Vol 24, No 1 (2025): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v24i1.97153

Abstract

This paper studies the dynamic response of masonry wall structures under blast loading. It requires a detailed understanding of the explosion phenomenon, wave propagation, and the structure's response to these shocks. The blast load is applied to the surface of the masonry wall. The main focus is to evaluate the dynamic response of a masonry wall due to a blast load. We used the Finite Element Method (FEM) for modeling the dynamic structural response to explosions. The explicit finite element modeling and analysis are done using ABAQUS CAE software. In this study, the model uses materials, namely Masonry. Masonry could be a composite structure entrenched by blocks of bricks articulated by mortar joints. In this study, the properties of the material used are clay bricks masonry as orthotropic materials. The structural analysis carried out in this study is related to stress, strain, and deformation due to the given loading.
Analysis of Stern Flap Application on Planing Hulls to Reduce Resistance Using CFD Hidayat, Indra Nurul; Bahatmaka, Aldias; Rumapea, Fedrik Immanuel; Exada, Dandi
Mekanika: Majalah Ilmiah Mekanika Vol 25, No 1 (2026): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v25i1.114603

Abstract

Planing hulls exhibit complex hydrodynamic characteristics at high speeds due to two-phase flow interactions, variations in wetted surface area, and nonlinear pressure distributions, making resistance prediction challenging. This study evaluates the effect of stern flap angle and span width on the total resistance of a planing hull under calm-water conditions. Numerical simulations were conducted using a Reynolds-Averaged Navier–Stokes (RANS)-based Computational Fluid Dynamics approach with a k–ε turbulence model and the Volume of Fluid (VOF) method in ANSYS Fluent. The numerical model was validated against a benchmark CFD study previously verified with Fridsma's experimental data, showing deviations below 5% across the investigated Froude number range. Parametric simulations were performed for stern flap angles of 2°, 4°, and 6° with span widths of 43%, 48%, and 53% of the hull breadth. The results indicate that stern flap configuration significantly affects resistance, particularly under full planing conditions. The optimal configuration was obtained at a span of 53% of the hull breadth with a 2° flap angle, reducing the non-dimensional resistance (R/Δ) from 0.186 to 0.1699 (9.69%) at Fr = 1.8. Trim analysis shows an average reduction of 1.16°, contributing to the observed decrease in resistance.
Mechanical Design and Prototype of Meatball Dough Grinder and Mixer Machine for Meat Processing in Indonesian Regions Prabowoputra, Dandun Mahesa; Setiawan, Adi Febrianto; Ramadhana, Enrico Chandra; Onistia, Welsa Okta; Sulaiman, Robi; Arifiantio, Rokhmat; Prasetyo, Gagah Hari
Mekanika: Majalah Ilmiah Mekanika Vol 24, No 1 (2025): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v24i1.97476

Abstract

A Meatball Dough Grinding-Mixing (MDGM) machine is a device that transforms raw meat into meatball dough through a combination of grinding and mixing processes, similar to a food processor or blender. The MDGM machine features four sharp stainless-steel blades. The rotation of the blade is driven by an electric motor with a power rating of 1 HP, operating at an engine speed of 2800 rpm. This engine speed is then transmitted through a belt pulley transmission with a diameter ratio of 3:5. The belt moves the installed blade at a rate of 1600 rpm. This MDGM machine has a capacity of 6 kg in one process. In this MDGM machine, one shaft stands vertically. The shaft has a diameter of 15 mm and a length of 400 mm. Pegs on the shaft, with dimensions of 6 mm in height and 6 mm in width, hold the rotating pulley in place when the engine is operating.
Integrating Agro-Waste Fiber into Sustainable Textile Innovation: Characterization of Mechanically Extracted Pineapple Leaf Fiber (PALF) for Circular Composite Applications Darmawi, Ahmad; Parmawati, Sih; Ikhsani, Nurfadilah; Fahad, Fahad
Mekanika: Majalah Ilmiah Mekanika Vol 25, No 1 (2026): MEKANIKA : Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v25i1.107494

Abstract

This study explores the potential of pineapple leaf fiber (PALF) from the Queen variety as a sustainable reinforcement material for green composites and textiles, focusing on the effects of mechanical retting. The research addresses critical barriers to industrial adoption, such as fiber-quality variability and hydrophilicity, while highlighting an innovative waterless extraction method that reduces environmental impact compared with conventional processes. A quantitative experimental approach was employed to comprehensively characterize PALF, incorporating standardized tensile testing to measure mechanical properties and microscopic analyses with a Scanning Electron Microscope (SEM) to observe fiber morphology. Findings demonstrate that mechanical retting significantly improves PALF’s tensile strength (23.2 g/tex) and fineness (33.7 dtex). Microscopic analysis reveals a uniform, compact fiber structure that underpins the material's enhanced mechanical performance. PALF emerges as a viable, eco-friendly alternative to synthetic fibers. The waterless mechanical retting process is an effective method for producing high-quality reinforcement fibers, offering practical guidance for industries. This approach contributes significantly to agricultural waste reduction and advances circular economy principles in sustainable materials development.
Comparative Analysis of the Size of Glass Fiber Woven Roving based on a Polyester Matrix on the Impact Strength of Composite Materials Lazuardy, M. Fajar; Fakhruddin, Muhammad
Mekanika: Majalah Ilmiah Mekanika Vol 23, No 1 (2024): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v23i1.76695

Abstract

Laminated Glass Fiber Reinforced Polymer (GFRP) composites are widely used in various industries, such as boat building, car bodies, water tanks and pipelines, which in their use sometimes have the potential to be exposed to impact loads, especially in transportation equipment. Therefore, it is necessary to perform an impact test to determine the toughness value of a composite material against impact loads. This study aims to investigate the characteristics of fibreglass Woven Roving (WR)/polyester composites produced by the compression moulding process to determine the toughness of the composite material concerning changes in weave size. This research uses variations of glass fibre woven roving in sizes of 200 gsm, 400 gsm, 600 gsm. The impact test was conducted following the American Society for Testing Materials (ASTM) D6110-10. The impact test result showed that the lowest impact strength is found in a composite with a woven size of 200 gsm, which is 0.145 J/mm2, and the highest impact strength is found in composite with a woven size of 600 gsm, which is 0.280 J/mm2. 

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