Mekanika: Majalah Ilmiah Mekanika最新文献_第2页

Failure criteria in crashworthiness analysis of ship collision and grounding using FEA: Milestone and development 基于有限元分析的船舶碰撞与搁浅失效准则:里程碑与发展

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2023-03-31 DOI: 10.20961/mekanika.v22i1.70959

H. Carvalho, Ridwan Ridwan, S. Sudarno, A. Prabowo, D. Bae, N. Huda

引用次数: 8

Mechanical Properties Of Pack Carburized AISI 4340 With Variation Energizer Composition of Barium Carbonate (BaCO3) And Sodium Carbonate (Na2CO3) 增效剂碳酸钡(BaCO3)和碳酸钠(Na2CO3)的变化对AISI 4340包渗碳力学性能的影响

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2023-03-31 DOI: 10.20961/mekanika.v22i1.63870

Agris Setiawan, Sapna Yusmania, Anton Sudiyanto

{"title":"Mechanical Properties Of Pack Carburized AISI 4340 With Variation Energizer Composition of Barium Carbonate (BaCO3) And Sodium Carbonate (Na2CO3)","authors":"Agris Setiawan, Sapna Yusmania, Anton Sudiyanto","doi":"10.20961/mekanika.v22i1.63870","DOIUrl":"https://doi.org/10.20961/mekanika.v22i1.63870","url":null,"abstract":"<div><table cellspacing=\"0\" cellpadding=\"0\" align=\"right\"><tbody><tr><td align=\"left\" valign=\"top\"><p>The aim of this research was to determine the mechanical strength of AISI 4340 steel after pack carburizing with variation of barium carbonate (BaCO<sub>3</sub>) and sodium carbonate (Na<sub>2</sub>CO<sub>3</sub>) as energizer. The various ratios of energizer: 40/60, 50/50 and 60/40 w/w%. Mechanical test was conducted to determine tensile (ASTM E-8), impact charpy strength (ASTM E-23), rockwell hardness number (ASTM E-18) and microstructure characterization (ASTM E-3). Both type specimens were temperature pack carburized is 950ºC and holding time is 3 hours. Results showed that specimen C has a lowest ultimate tensile strength mean values than the other specimens, which is 333.43±30.22 MPa. The results of the impact test showed that the lowest impact energy value is found in specimen C, which is 4.32 joules and the highest impact energy value is found in specimens without treatment, which is 15.80 joules. Based on microscope observation indicated that microstructure of specimen was martensite structure increase and the results of the hardness test was influenced by martensite phase, specimen C has the highest hardness compared to other specimens, which is 80.70 HRC while the untreated specimen is 56.90 HRC.</p></td></tr></tbody></table></div>","PeriodicalId":356258,"journal":{"name":"Mekanika: Majalah Ilmiah Mekanika","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127078911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Adding Al2O3 on the Macrostructure of Friction Stir Welding Polypropylene Sheet Al2O3对搅拌摩擦焊聚丙烯薄板宏观组织的影响

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2023-03-31 DOI: 10.20961/mekanika.v22i1.63026

Dinda Clara, F. Mikšík, B. Kusharjanta, T. Triyono, Aniddya Salsabila Kurnia Putri

{"title":"Effect of Adding Al2O3 on the Macrostructure of Friction Stir Welding Polypropylene Sheet","authors":"Dinda Clara, F. Mikšík, B. Kusharjanta, T. Triyono, Aniddya Salsabila Kurnia Putri","doi":"10.20961/mekanika.v22i1.63026","DOIUrl":"https://doi.org/10.20961/mekanika.v22i1.63026","url":null,"abstract":"In this study, an experimental investigation has been carried out to determine the effect of alumina (Al2O3) addition in joining polypropylene. Polypropylene is a thermoplastic material used most as a non-metallic material. One of the joining methods that can be applied in Polypropylene is Friction Stir Welding (FSW). The use of Al2O3 as a filler is to modify the polypropylene matrix's properties to improve the joint's quality. The Al2O3 powder with 99 9% purity was inserted along the polypropylene plates in the groove. This research analyzed the role of adding Al2O3 and tool rotation speed concerning the joints' quality. The experiment was performed under different values of tool speed rotation (204 rpm, 356 rpm, 620 rpm, and 1140 rpm) and the presence or absence of the addition of alumina powder. Then, the joint's quality is visually observed by optical macroscopy at the top and cross-section view. From macroscopic observations, adding alumina could make the visual of the joint look better and result in minimum defects than the joint without alumina addition. Instead, the increasing tool speed rotation helped the distribution of alumina during the welding process.","PeriodicalId":356258,"journal":{"name":"Mekanika: Majalah Ilmiah Mekanika","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133975586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of the Bengawan Unmanned Vehicle (UV) Roboboat: Mandakini Neo 班加万无人驾驶(UV)机器船的设计:Mandakini Neo

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2022-10-03 DOI: 10.20961/mekanika.v21i2.61624

H. Nubli, Fahri Setyo Utomo, H. Diatmaja, A. Prabowo, U. Ubaidillah, D. Susilo, W. Wibowo, T. Muttaqie, Fajar Budi Laksono

{"title":"Design of the Bengawan Unmanned Vehicle (UV) Roboboat: Mandakini Neo","authors":"H. Nubli, Fahri Setyo Utomo, H. Diatmaja, A. Prabowo, U. Ubaidillah, D. Susilo, W. Wibowo, T. Muttaqie, Fajar Budi Laksono","doi":"10.20961/mekanika.v21i2.61624","DOIUrl":"https://doi.org/10.20961/mekanika.v21i2.61624","url":null,"abstract":"Mandakini Neo is an autonomous vehicle that was designed and built by the students of the Universitas Sebelas Maret, which was included in the Bengawan Unmanned Vehicle (UV) Roboboat Team to compete in the annual international Roboboat competition of 2021. This competition requires participants to complete several missions; one of the main missions is to move through two gates made from four poles using full automatic navigation, in order to continue on with the other missions. To complete the course, we used Pixhawk and GPS to allow the ship to run automatically, while minimizing the ship’s movement tolerance. The use of Mission Planner software for monitoring, and also for color and shape image processing to help with the reading of objects, along with a sensor fitted on the ship, allowed the mission to be completed. Mandakini Neo was made with the capacity, speed, and comfort of the ship in mind, as well as the ship’s hydrodynamic performance, stability, volume, structural integrity, and construction cost. Following its development we conducted tests of stability, maneuverability, and seakeeping in order to achieve the smallest possible resistance rate; for this purpose, we used the Savitsky method. The manufacture of the ship also required the choosing of the material, the use of the sensor, and also selection of an appropriate system. Finally, the design that we developed was a ship with a catamaran hull type, for which the dimensions had already been calculated, and the proper materials decided, and simple electrical components were able to be obtained for the sensor and the system.","PeriodicalId":356258,"journal":{"name":"Mekanika: Majalah Ilmiah Mekanika","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133623930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Experimental Study Influences Changes In Compression Ratio To Performance Of Single Cylinder Otto Engine 压缩比变化对单缸奥托发动机性能影响的实验研究

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2022-10-03 DOI: 10.20961/mekanika.v21i2.59487

W. E. Juwana, R. A. Rachmanto, Mugi Wiyono, Iwan Istanto

引用次数: 0

Effect of Alkaline Treatment and Fumigation (Fumigation) on the Mechanical Properties of Fiber Unsaturated Polyester-Cantula Composite with Compression Molding Method 碱处理和熏蒸对纤维不饱和聚酯- canula压缩成型复合材料力学性能的影响

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2022-10-03 DOI: 10.20961/mekanika.v21i2.51493

M. Salim, M. Rafidya, Bintang Ramadhan, Elvira Wahyu, Arum Fanani, D. Ariawan, E. Surojo

引用次数: 0

Prospects and State of the Glass Industry in Saudi Arabia and a preliminary assessment of the quality of Glass and Glass-Ceramics Fabrication 沙特阿拉伯玻璃工业的前景和现状以及玻璃和玻璃陶瓷制造质量的初步评估

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2022-10-03 DOI: 10.20961/mekanika.v21i2.64294

E. R. Mahmoud, A. Shaharoun, A. Aljabri, H. Almohamadi, M. Farhan

{"title":"Prospects and State of the Glass Industry in Saudi Arabia and a preliminary assessment of the quality of Glass and Glass-Ceramics Fabrication","authors":"E. R. Mahmoud, A. Shaharoun, A. Aljabri, H. Almohamadi, M. Farhan","doi":"10.20961/mekanika.v21i2.64294","DOIUrl":"https://doi.org/10.20961/mekanika.v21i2.64294","url":null,"abstract":"Although the economic value of glass products and its importance to the Saudi National Economy is vast, not much information is available about the current state of the art of the industry. Likewise little information is available about the geography, potential sites for mining sand as well as the evaluation of sand quality. This paper attempts to bridge this gap by presenting a feasibility study of fabricating normal glass and glass ceramics from Saudi Arabia’s domestically available raw materials. It discusses the current status of glass industry in Saudi Arabia and the Middle East region. It also gives a brief explanation about the sand topography in Saudi Arabia. In order to determine the feasibility of fabricating glass using these raw materials, experimental data on the fabrication of normal glass and glass-ceramics from indigenously available raw materials was obtained and reported as part of the findings of this paper Firstly, normal transparent glass were able to be fabricated without any apparent large defects using sand collected from Ar-Rayis region in Saudi Arabia. Four nano-sized crystallization catalysts, namely VC, WC, TiC and Y2O3, were added to the constituents of the glass in 3 wt.%. For VC, the crystallization process was limited. The glass ceramics of WC consisted of multi-dimensional edges crystals which covered all the matrix. Gray crystalline whiskers were obtained by addition of TiC. The Y2O3- glass ceramics consisted of multi-directionally rosette crystals. Finally, the microhardness values of the added crystallization catalysts glass ceramics were obtained and found to be much higher compared to normal glass. The results show that glass of high quality can be produced specifically for Ar—Rayis region which would be of interest to researchers, glass industry personnel and potential investors","PeriodicalId":356258,"journal":{"name":"Mekanika: Majalah Ilmiah Mekanika","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131390076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Holding Time and Temperature of Hot Pressing on Tensile Strength of Biodegradable Plastic Made of Carrageenan 保温时间和热压温度对卡拉胶可生物降解塑料抗拉强度的影响

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2022-10-03 DOI: 10.20961/mekanika.v21i2.64292

F. Imaduddin, Palgunadi Sastra, W. W. Raharjo, P. Wullandari, Ridwan Ridwan

{"title":"Effect of Holding Time and Temperature of Hot Pressing on Tensile Strength of Biodegradable Plastic Made of Carrageenan","authors":"F. Imaduddin, Palgunadi Sastra, W. W. Raharjo, P. Wullandari, Ridwan Ridwan","doi":"10.20961/mekanika.v21i2.64292","DOIUrl":"https://doi.org/10.20961/mekanika.v21i2.64292","url":null,"abstract":"The most significant environmental problem was caused by plastic. One way to handle plastic waste was using biodegradable plastic because it faster decomposes naturally. Biodegradable plastic can be made from carrageenan by the hot press method. This method can make biodegradable plastic with large dimensions. However, the plastic quality depended on the holding time, temperature, and pressure selected during the hot pressing process. Therefore, this research is conducted to determine the effect of holding time and temperature in the hot press process on the tensile strength of biodegradable plastic made from carrageenan. The composition of the biodegradable plastic material used was 35% carrageenan, 35% polyvinyl alcohol (PVA), and 30% glycerol. In the manufacture of composites, the holding time was varied: 10, 20, 30, and 40 minutes, as well as the process temperature varied from 100, 110, 120, and 130 °C. The tensile strength of the composite was observed through tensile testing using a Universal Testing Machine. FTIR, XRD, and SEM tests were also conducted to sharpen the analysis. The addition of holding time led to an increase in the tensile strength of biodegradable plastics. The highest tensile strength was obtained at a holding time of 30 minutes with a value of 4.45 MPa. After 30 minutes, the tensile strength of the biodegradable composite decreased. Meanwhile, the addition of process temperature caused a decrease in the tensile strength of biodegradable plastics. The highest tensile strength was obtained at a process temperature of 100 °C with a value of 5.28 MPa.","PeriodicalId":356258,"journal":{"name":"Mekanika: Majalah Ilmiah Mekanika","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130306527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Test of Ignition Timing with Programable CDI on Performance Single Cylinder Otto Engine 高性能单缸奥托发动机可编程CDI点火正时试验研究

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2022-10-03 DOI: 10.20961/mekanika.v21i2.58951

R. A. Rachmanto, Martinus Darmawan Bagas Wijayanto, W. E. Juwana, P. Kataraki

引用次数: 0

Effect of Turbine Blades Transformation on Savonius Turbine Performance 涡轮叶片改造对萨伏纽斯涡轮性能的影响

Mekanika: Majalah Ilmiah Mekanika Pub Date : 2022-04-14 DOI: 10.20961/mekanika.v21i1.48619

Muhammad Iyas Abdul Alim

引用次数: 0