https://msr.bkstm.org/index.php/msr/issue/feed 2025-04-13T19:05:28-07:00 Dr. Ubaidillah ubaidillah_ft@staff.uns.ac.id Open Journal Systems <p><strong>Mechanical Science Reports </strong>is an open access journal published by Badan Kerjasama Teknik Mesin (BKSTM) Indonesia and is engaged in the scope of energy conversion such as new renewable energy, emissions and combustion, fuels and lubricants, mass and heat transfer, thermal and fluid engineering, energy computing, power plant engineering, nano and pico energy, energy materials, energy storage and devices, and other things about energy conversion.</p> https://msr.bkstm.org/index.php/msr/article/view/10 2024-09-06T22:39:54-07:00 Ubaidillah ubaidillah_ft@staff.uns.ac.id Widyanita Harwijayanti ubaidillah_ft@staff.uns.ac.id Joko Triyono ubaidillah_ft@staff.uns.ac.id Pamudji Utomo ubaidillah_ft@staff.uns.ac.id Retno Setianing ubaidillah_ft@staff.uns.ac.id Aishah Abd. Aziz ubaidillah_ft@staff.uns.ac.id

<p align="justify"><em>In orthopaedic and dental implants, a bone graft has been widely used is a metal material because of its excellent mechanical properties. One of the materials used as an implant is titanium because of low modulus elasticity and corrosion resistance. However, using metal as an implant material has its drawback, because it has low bonding strength into bone tissue. Combining titanium and hydroxyapatite into composite has been becoming an option to increase implant materials bioactivity. Bibliometric analysis was conducted to find trends and contributions to titanium-hydroxyapatite composite research. About 932 documents on articles and reviews of Ti–HA composite was obtained from the SCOPUS. Exported data in CSV format were processed using VOS-viewer and Biblio-shiny to visualize annual scientific contributions, corresponding authors country, top published and top citation country and sources, top-citation affiliations and documents, also co-occurrence of all keywords by authors. China became the most publications document, and Sichuan University became the most relevant affiliation. From all sources, Biomaterials have the highest h-index of 32, with citations of 10,834 papers. The main topics from the authors keywords are “hydroxyapatite” and “composite coatings.” Research related to titanium hydroxyapatite composite has prospects for further development to be used in biomedical applications.</em></p>

2024-10-30T00:00:00-07:00 Copyright (c) 2025 Mechanical Science Reports https://msr.bkstm.org/index.php/msr/article/view/13 2024-09-06T22:14:01-07:00 Muhammad Fatoni Mawarudin daryono@umm.ac.id Daryono daryono@umm.ac.id Achmad Fauzan Hery Soegiharto achmadfauzan@umm.ac.id

<p>The railway suspension system is designed to reduce vibrations and shocks that occur when a train traverses the tracks. Given the high level of vibrations experienced by trains at high speeds, it is crucial to develop an effective suspension system to mitigate these vibrations. Previous studies focused on static analysis of the locomotive’s primary suspension spring. However, static stress analysis failed to reveal the cause of material failure, necessitating a dynamic analysis. This study focuses on the dynamic modelling and analysis of the primary suspension spring made of 46SiCrMo6 steel. The simulation tests were conducted using Ansys Workbench for modal and harmonic response analysis, while the geometric design of the spring was done in Inventor. The results showed that during modal analysis testing, the spring exhibited six natural frequency modes, corresponding to the train's bumping and turning conditions. The simulation of the 46SiCrMo6 steel spring indicated deformation in the middle coil, where strain occurred, leading to frequent material failure in these parts.</p>

2024-10-30T00:00:00-07:00 Copyright (c) 2025 Mechanical Science Reports https://msr.bkstm.org/index.php/msr/article/view/11 2024-06-24T23:35:03-07:00 Diah Gustanti muki.satya@unpas.ac.id Muki Satya Permana muki.satya@unpas.ac.id Djoko Hadi Prayitno muki.satya@unpas.ac.id Turnad Lenggo Ginta muki.satya@unpas.ac.id S. Sugiharto muki.satya@unpas.ac.id

<p align="justify">Implant materials offer a promising avenue for addressing human organ damage or dysfunction. The diverse requirements associated with implants or biomaterials drive ongoing research efforts. One critical criterion for implant materials is robust corrosion resistance to mitigate the risk of rejection within the body. This study aims to evaluate the corrosion behavior of Zr-Ag-Co implant material in lactated Ringer's solution. Zr-Ag-Co implant material, with 5% and 7.5% Co content, was synthesized via a melting process utilizing a Single Arc Melting Furnace under an argon gas atmosphere. The synthesized materials were characterized using optical microscopy and Vickers hardness testing. Corrosion behaviour was assessed employing a potentiostat with the Tafel polarization method in Ringer's lactate solution. Optical microscopy and X-ray diffraction (XRD) analysis revealed the presence of phases such as -Zr and -Zr, along with intermetallic compounds Zr₂Co and Zr2Ag. Hardness testing indicated that the increase of Co content led to elevated hardness values for the Zr-Ag-Co alloy, ranging from 496.87 to 510.44 HV.</p>

2024-10-30T00:00:00-07:00 Copyright (c) 2025 Mechanical Science Reports https://msr.bkstm.org/index.php/msr/article/view/12 2024-06-23T19:59:39-07:00 Wisnu Suganda wisnusuganda4679@gmail.com Hudah Alfian hudahal912@gmail.com Sri Mulyo Bondan Respati bondan@unwahas.ac.id Muhammad Dzulfikar dzulfikar@unwahas.ac.id

<p>Floor material technology has progressively advanced from conventional bare wood to the recent biocomposite floors. Designing materials having suitable mechanical properties and targeted deformation behavior is the key for the development of biocomposite materials for flooring applications. A series of naturally binding Trembesi-Tapioca blends was developed with the objective to obtain mechanical properties of hardwood and suited to resist impact deformation. Three naturally blends with volume ratio of Trembesi-Tapioca Matrix (Tr-TM) ranging between 40:60 and 60:40 were compared in this study. Their macrostructure, mechanical properties as well as fracture behavior were carefully investigated. Results show that their macrostructure is mainly composed of gum part with the appearance of particulate strongly blended. The flexural modulus and flexural strength of blends was comprised between 137 MPa and 6.06 kN/mm2 for Tr60TM to 142 MPa and 6.27 kN/mm2 for Tr40TM. This average flexural strength of biocomposite was balance in between of softwood and hardwood. All blends show similar deflection value. Among the blends studied in this work, the Tr40TM blend shows the highest impact value.</p>

2024-10-30T00:00:00-07:00 Copyright (c) 2025 Mechanical Science Reports https://msr.bkstm.org/index.php/msr/article/view/15 2025-04-13T19:05:28-07:00 Asroful Abidin asrofulabidin@unmuhjember.ac.id

<p>This study evaluates the effect of adding bioethanol to Pertamax fuel at concentrations of 10%, 15%, and 20% on the performance of a C-series 100 gasoline engine. Using a quasi-experimental design, tests were conducted with a dynamometer to measure changes in power (horsepower) and torque at various time intervals. The results showed that the addition of 20% bioethanol resulted in a significant improvement, with a peak power of 3.6 HP and a maximum torque of 36.2 N·m at 3.78 seconds, indicating more efficient combustion due to the higher octane rating and oxygen content in bioethanol, which enhances the combustion process. The 15% blend also delivered positive results with a peak power of 3.3 HP and torque of 32.79 N·m at 4.54 seconds, while the 10% blend showed more moderate gains. Despite the performance improvements, attention should be paid to potential long-term side effects such as corrosion and changes in the engine's lubrication characteristics due to bioethanol's hygroscopic properties. These findings reinforce the role of bioethanol as an eco-friendly and efficient alternative fuel in improving vehicle performance while reducing carbon emissions. This research significantly contributes to the automotive industry and policymakers developing sustainable fuel technologies. It serves as a reference for optimizing bioethanol blends to achieve a balance between enhancing engine performance and component durability.</p>

2024-10-30T00:00:00-07:00 Copyright (c) 2025 Mechanical Science Reports