Articles
<![CDATA[Mechanical Properties Transformation On Zr54Al17Co29 Bulk Metallic Glass by Partial Crystallization ]]>
<![CDATA[Pradana, Yanuar Rohmat Aji]]>;
<![CDATA[Jang, Jason Shian-Ching]]>;
<![CDATA[Setyabudi, Sofyan Arief]]>
<![CDATA[ Jurnal Rekayasa Mesin Vol 8, No 1 (2017) ]]>
Publisher : <![CDATA[Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya ]]>
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DOI: 10.21776/ub.jrm.2017.008.01.4
<![CDATA[Study on biomaterials is recently essential for rapid development of medical application and Zr54Al17Co29 BMGbecomes promising candidate due to the lack of toxic elements. Partial crystallization by isothermal annealing at SCL region was used to variate the crystallinities of BMG. The structural and thermal properties of as cast and partially crystallized samples were confirmed by XRD and DSC test, while microvickers and compression test were further utilized to investigate their mechanical properties. By the higher crystallinity, the hardness could be slightly increased in range 540 ± 5 to 575 ± 5 Hv. As-cast sample shows the yield strength and plastic strain of 2130 ± 75 MPa and 2.2 ± 1.6%. The yield strength is increased by the presence of 10% nanocrystal, afterwards, fall and raise phenomena are obtained with further crystallinity. However, with higher crystallinity, the plasticity is significantly degraded and no more plastic strain observed at sample with 50% of crystallinity. Both the presence of nanocrystalline phase and free volume annihilation are the reason of mechanical properties change on the Zr-based BMG.]]>
<![CDATA[PENINGKATAN KETRAMPILAN PENGOPERASIAN SOFTWARE CAD/CAM DAN MESIN 3D PRINTER PADA GURU SMK ]]>
<![CDATA[Bintara, Redyarsa Dharma]]>;
<![CDATA[Suryanto, Heru]]>;
<![CDATA[Aminnudin, Aminnudin]]>;
<![CDATA[Pradana, Yanuar Rohmat Aji]]>;
<![CDATA[Arbianto, Ferian Rizki]]>
<![CDATA[ Jurnal Graha Pengabdian Vol 2, No 1 (2020) ]]>
Publisher : <![CDATA[Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) Universitas Negeri Malang ]]>
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<![CDATA[Abstrak: Kegiatan pengabdian ini bertujuan untuk meningkatkan ketrampilan para guru jurusan mesin Sekolah Menengah Kejuruan (SMK) se-Kota dan Kabupaten Blitar dalam bidang CAM. Meningkatnya kualitas guru diharapkan pula dapat menjadi bagian dari upaya menyiapkan lulusan yang lebih kompestitif sebelum memasuki dunia kerja. Proses pelatihan dimulai dari penginstalan dan pengenalan software CAD dan CAM, pembuatan model 3D dan pencetakan model menjadi 3D fisik model. Hasil pelatihan menunjukan adanya peningkatan penguasaan software CAD, pengetahuan dan penguasaan software 3D Printing dan penggunaan mesin 3D Printer. Luaran yang meyertai dari kegiatan ini berupa penambahan modul pelatihan sebagai panduan belajarnya.Abstract: This service activity aims to improve the skills of teachers majoring in Vocational High School (SMK) machines in the City and District of Blitar in the field of CAM. Increasing the quality of teachers is also expected to be part of efforts to prepare graduates who are more competitive before entering the workforce. The training process begins with the installation and introduction of CAD and CAM software, the creation of 3D models and the printing of models into physical 3D models. The training results showed an increase in mastery of CAD software, knowledge and mastery of 3D Printing software and the use of 3D Printer machines. The output that follows from this activity is the addition of training modules as a study guide.]]>
<![CDATA[Study on The Thermal Distortion, Hardness and Microstructure of St 37 Steel Plate Joined Using FCAW ]]>
<![CDATA[Maijuansyah Maijuansyah]]>;
<![CDATA[Yanuar Rohmat Aji Pradana]]>;
<![CDATA[Gaguk Jatisukamto]]>;
<![CDATA[Solichin Solichin]]>
<![CDATA[ Journal of Mechanical Engineering Science and Technology (JMEST) Vol 3, No 1 (2019) ]]>
Publisher : <![CDATA[Universitas Negeri Malang ]]>
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DOI: 10.17977/um016v3i12019p018
<![CDATA[This study sets out to investigate the distortion angle, microstructure, and hardness of St 37 steel plate weld joint produced by FCAW using the welding current of 80, 110, and 140 A. By using flat position, CO2 and E71T-1 wire were utilized as a shielding gas and electrode filler, respectively. The distortion angle measurement was done on 3 different locations of the welded sample perpendicular to weld direction by using bevel protractor. The micro Vickers tests were then applied gradually at the cross-sectional surface with a distance of 0, 5, 10 and 15 mm from weld centreline using the load of 300 g for indentation time of 15 s. A series of microstructural observations were subsequently directed on cross-sectional weld joint regions including base metal, heat-affected zone (HAZ) and weld metal to investigate the microstructural transformation. From the results, it can be observed that increasing welding current can reduce the hardness at all indentation regions as well as inducing a higher level of thermal distortion occurred on a weld joint, especially at HAZ. The microstructural transformation was also observed at sample welded using various welding current. Both heat input and cooling rate subjected to the welded sample played an important role to characterize their properties.]]>
<![CDATA[PENERAPAN MESIN PRESS BODI MULTIFUNGSI BAGI BENGKEL KONSTRUKSI MOTOR TRAIL DESA GADUNGAN KECAMATAN WATES KABUPATEN KEDIRI ]]>
<![CDATA[Yanuar Rohmat Aji Pradana]]>;
<![CDATA[Heru Suryanto]]>;
<![CDATA[aminnudin aminnudin]]>
<![CDATA[ Jurnal Pengabdian Pendidikan dan Teknologi (JP2T) Vol 1, No 2 (2020) ]]>
Publisher : <![CDATA[Universitas Negeri Malang ]]>
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DOI: 10.17977/um080v1i22020p113-124
<![CDATA[Abstrak. Pengabdian kemitraan masyarakat ini diterapkan pada bengkel modifikasi trail Trelwork sebagai mitra di Desa Gadungan Kecamatan Wates Kabupaten Kediri Jawa Timur karena dalam fabrikasi rangka trail masih secara manual dengan waktu produksi yang lama dan kualitas produk yang rendah. Kegiatan ini bertujuan untuk (1) membantu mengakselerasi perkembangan UMKM dengan menerapkan mesin press bodi multifungsi yang inovatif untuk melakukan 2 kerja sekaligus, yaitu centering rangka dan press produk penyangga samping motor trail, (2) meningkatan kapasitas produksi dan kualitas produk mitra dalam produksi dan reparasi motor trail. Metode pelaksanaan yang dilakukan selama 10 bulan meliputi: (1) analisis masalah/kebutuhan, (2) perancangan mesin dan analisa desain (3) pembuatan mesin (4) uji performa dan transfer teknologi alat, (5) penerapan mesin kepada mitra usaha dan (6) evaluasi hasil. Perubahan yang didapatkan setelah penerapan mesin adalah peningkatan kecepatan kerja dan kualitas produk yang dihasilkan disamping bertambahnya kemampuan untuk menghasilkan produk tambahan. Selain itu, aspek kemudahan, ergonomi, dan keselamatan kerja juga mengalami peningkatan.Kata Kunci: motor trail, mesin press bodi multifungsi, rangka dan penyangga samping, produktivitas, kualitas]]>
<![CDATA[IMPLEMENTASI TEKNOLOGI PERANGKAP HAMA BERTENAGA SURYA DAN MESIN PEMERAS JERUK DI KEBUN PETIK JERUK GARUM, KABUPATEN BLITAR ]]>
<![CDATA[Yanuar Rohmat Aji Pradana]]>
<![CDATA[ Jurnal Pengabdian Pendidikan dan Teknologi (JP2T) Vol 3, No 1 (2022) ]]>
Publisher : <![CDATA[Universitas Negeri Malang ]]>
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DOI: 10.17977/um080v3i12022p67-75
<![CDATA[UMKM Wisata Petik Jeruk Mak War yang berada di Combong, Kecamatan Garum, Kabupaten Blitar memiliki luas lahan perkebunan 4000 m2 yang ditumbuhi hampir 600 pohon jeruk keprok siem dengan total hasil panen 12 ton buah jeruk per tahun dan secara geografis sangat potensial karena berada di pusat Kabupaten Blitar dan dilalui jalur provinsi. Permasalahan yang sedang dihadapi adalah serangan hama lalat buah (Bractocera sp.) yang membuat buah rusak dan busuk serta mengakibatkan pemilik kehilangan lebih dari 10 persen hasil panen per tahun karena buah tidak layak konsumsi. Selain itu, pandemi COVID-19 juga membuat angka kunjungan wisata menurun secara signifikan hingga 30 persen dan terus bertambah seiring dengan bertambahnya kasus positif COVID-19 di Indonesia. Hal ini memaksa pemilik untuk menjual jeruk hasil panen dengan harga rendah karena belum memiliki mesin pengolah jeruk mengingat usia usaha yang masih muda. Oleh karena itu, permasalahan mitra akan diatasi dengan pelatihan implementasi LED-based insect trap bertenaga surya serta penerapan teknologi pengolahan buah jeruk menjadi minuman maupun konsentrat dalam bentuk mesin pemeras jeruk otomatis untuk meningkatkan nilai jual dan memperpanjang usia produk jeruk, sehingga buah jeruk tidak kehilangan kandungan rasa dan gizi karena penyimpanan yang terlalu lama. Dengan upaya ini, diharapkan pengelola kebun dapat meningkatkan penghasilan dengan menjual produk olahan jeruk. Metode pelaksanaan yang direncanakan berjalan 9 bulan mencakup pemecahan masalah aspek manajemen dan produksi, meliputi: (1) analisis kebutuhan mitra, (2) perancangan perangkap hama bertenaga surya dan mesin pemeras jeruk, (3) fabrikasi mesin (4) uji performa dan transfer teknologi, (5) penerapan mesin kepada mitra dan (6) evaluasi hasil. ]]>
<![CDATA[Effect of Homogenization Pressure on Bacterial Cellulose Membrane Characteristic Made from Pineapple Peel Waste ]]>
<![CDATA[Muhamad Muhajir]]>;
<![CDATA[Heru Suryanto]]>;
<![CDATA[Yanuar Rohmat Aji Pradana]]>;
<![CDATA[Uun Yanuhar]]>
<![CDATA[ Journal of Mechanical Engineering Science and Technology (JMEST) Vol 6, No 1 (2022) ]]>
Publisher : <![CDATA[Universitas Negeri Malang ]]>
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DOI: 10.17977/um016v6i12022p034
<![CDATA[Many studies were conducted to maintain the environment by reducing the waste, especially pineapple peel waste. This study aims to explore the effect of various pressure of the homogenization process on bacterial cellulose membrane surface morphology and structure produced using extract of pineapple peel waste. The methods include the preparation of pellicle samples from the product of the fermentation process of Acetobacter xylinum using a medium from the extract of pineapple peel waste. Bacterial cellulose pellicles were crushed using a blender. Mashed bacterial cellulose pellicle then homogenized in High-Pressure Homogenizer with pressure variation of 0 bar, 150 bar, 300 bar, 450 bar, dan 600 bar then cast into a mold. The bacterial cellulose solutions were dried in an oven at 60°C for 8 hours. The dried bacterial cellulose membrane was analyzed using XRD for the structure and SEM analysis for the morphology. The results indicate that the crystalline properties of BCM were shifted after being treated by various pressure processing in a High-Pressure Homogenizer. It was found that the High-Pressure Homogenizer with higher pressure reduced the peak intensity, decreased crystalline index from 87% to 70%, and decreased the degree of crystalline from 88% to 77% without changing the cellulose structure. The higher pressure of the homogenization process causes the porosity of the membrane to be decreased.]]>
<![CDATA[Analisis Kapasitas Spesifik Simetris dan Asimetris Coin Cell Superkapasitor menggunakan Reduksi Graphene Oksida dan Doping Boron Graphene ]]>
<![CDATA[Nurlia Pramita Sari]]>;
<![CDATA[Muhammad Fakhruddin]]>;
<![CDATA[Mochamad Muzaki]]>;
<![CDATA[Hangga Wicaksono]]>;
<![CDATA[Andita N.F. Ganda]]>;
<![CDATA[Yanuar Rohmat Aji Pradana]]>
<![CDATA[ G-Tech: Jurnal Teknologi Terapan Vol 7 No 2 (2023): G-Tech, Vol. 7 No. 2 April 2023 ]]>
Publisher : <![CDATA[Universitas Islam Raden Rahmat, Malang ]]>
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DOI: 10.33379/gtech.v7i2.2344
<![CDATA[Superkapasitor banyak diteliti karena kepadatan dayanya yang tinggi, siklus hidup yang panjang, dan fungsinya yang memiliki output daya tinggi dan yang memiliki penyimpanan energi tinggi. Graphene memiliki luas permukaan spesifik yang besar dan konduktifitas elektrik yang tinggi sehingga baik digunakan sebagai elektroda pada coin cell superkapasitor. Boron dinilai sebagai unsur kimia yang baik sebagai bahan dopan. Artikel ini bertujuan untuk menganalisa penggunaan reduksi graphene oksida dan doping boron graphene oksida sebagai bahan elektroda dari asimetris dan simetris coin cell superkapasitor. Metode yang digunakan adalah eksperimental dengan reduksi graphene oksida dan doping boron graphene yang digunakan sebagai katoda dan anoda coin cell superkapasitor. Pereduksian dilakukan dengan proses pirolisis dalam atmosfer argon dan hidrogen pada temperatur tinggi. Hasilnya menunjukkan graphene dapat didoping menggunakan boron dan dapat digunakan sebagai elektroda (katoda dan anoda) pada coin cell simetris dan asimetris. Nilai kapasitas coin cell asimetris merupakan nilai pertengahan dari coin cell simetris dari bahan katoda dan anodanya.]]>
<![CDATA[Optimization of Injection Pressure and Time of Injection Molding for Eye Drop Heads ]]>
<![CDATA[Ichlasul Insani]]>;
<![CDATA[Andoko Andoko]]>;
<![CDATA[Yanuar Rohmat Aji Pradana]]>
<![CDATA[ TRANSMISI Vol 19, No 2 (2023): September 2023 ]]>
Publisher : <![CDATA[Universitas Merdeka Malang ]]>
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DOI: 10.26905/jtmt.v19i2.10022
<![CDATA[Injection molding is a plastic production process by injecting liquid plastic into a mold. One of the injection molding products is an eye drop head. Eye drops in its production experienced rejects reaching 37.5% due to defects. The purpose of this optimization is to obtain the optimum setting of injection pressure and time of injection molding machine using RSM. The method to achieve the goal through finite element approach with pre-processing includes design and setting boundary conditions for injection pressure (10.5, 11, and 11.5 MPa) and injection time (1.9, 2.0, and 2.1 seconds). Post processing displays the results of product mass, defects, and quality prediction which are further optimized using RSM to obtain optimum values. The simulation results show that higher injection pressure and lower injection time have given satisfactory results for all three parameters (product mass, defects, and quality prediction) observed. Based on the optimization results, the optimal injection molding settings were obtained at an injection pressure of 11.5 MPa and injection time of 1.9 seconds which resulted in a product mass of 0.429 g, weld line defect of 0.1384, and quality prediction of 80.9%.]]>
<![CDATA[Optimization of Melt and Coolant Temperature on Defects of Injection Molded Toothbrush Handle ]]>
<![CDATA[Mochammad Arief Susetyo]]>;
<![CDATA[Andoko Andoko]]>;
<![CDATA[Yanuar Rohmat Aji Pradana]]>
<![CDATA[ TRANSMISI Vol 19, No 2 (2023): September 2023 ]]>
Publisher : <![CDATA[Universitas Merdeka Malang ]]>
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DOI: 10.26905/jtmt.v19i2.10021
<![CDATA[The toothbrush handle is an injection molded product that rejects up to 10%. One of the factors that cause defects is the injection molding process settings, namely melting and cooling temperature. The purpose of this optimization is to obtain the optimum value of melt and cooling temperature parameters on product quality (minimum defects) of toothbrush handles using RSM. The methods used include simulation using ANSYS to obtain mold temperature, Autodesk Moldflow to obtain product defects and quality prediction based on input parameters of melt temperature (190o , 200o , and 210o C) and coolant temperature (22o , 24o , and 26o C), and Minitab 19 for RSM optimization. The simulation results that cooling temperature and melt temperature that are too low and high result in high defect values (weld line and shrinkage) in the product, resulting in low quality prediction values. Based on the results of the optimized simulation, the best injection molding setting is at a melt temperature of 200oC and a cooling temperature of 24oC which obtains a toothbrush handle product quality response variable of 78.04% with a minimum weld line value of 0.0277o and a minimum shrinkage depth of 0.009 mm.]]>
<![CDATA[The Effect of Cutting Speed of Nitrogen Laser Cutting on the Surface Texture of SUS 304 Plate ]]>
<![CDATA[Pradana, Yanuar Rohmat Aji]]>;
<![CDATA[Afrianto, Raka]]>;
<![CDATA[Rahman, Chandra Hairat Abdul]]>;
<![CDATA[Andoko, Andoko]]>
<![CDATA[ Journal of Mechanical Engineering Science and Technology (JMEST) Vol 7, No 1 (2023) ]]>
Publisher : <![CDATA[Universitas Negeri Malang ]]>
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DOI: 10.17977/um016v7i12023p066
<![CDATA[The focus of today’s machining industry is on how to maintain high productivity and low cost achieved by high tool life during the operation. Laser cutting is considered the right solution because it offers cutting speeds of up to 170000 mm/min through a non-contact process regardless of the workpiece material hardness. The aim of this study is to analyze the effect of cutting speed on the surface texture aspects namely surface roughness, kerf shape, and dross height on the stainless steel 304 plate after laser cutting. The nitrogen laser was utilized with the cutting speed of 400, 1700, and 2000 mm /min and the average roughness (Ra) was then measured using a surface roughness tester. On the other hand, the top, middle, and bottom area of the kerf surface as well as the dross height were analyzed by scanning electron microscopy (SEM). The highest Ra value was resulted at cutting speed of 2000 mm/min with 2.965 ± 0.05 μm while the lowest was at 1400 mm/min with 2.522 ± 0.16 μm. In parallel, the Ra was found to be higher when subjected gradually from the top to bottom zone. The kerf surface also proved that the top zone is dominated by the cutting zone, while the middle and bottom zone are characterized by the transition and deformation zone respectively. The width between kerf lines increased when the higher cutting speed was performed. Additionally, the larger dross height was found at the cutting speed of 1400 mm/min with 32.75 ± 5.21 μm and then degraded gradually at the higher cutting speed. The heat input and laser capability in exposing the material thickness are responsible for determining the corresponding surface texture aspects.]]>
