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Uji impak mesin heated die screw extruder pada pembriketan limbah pertanian Budiana, Eko Prasetya; Himawanto, Dwi Aries; Prija T., D. Danardono D.; Widodo, Purwadi Joko; Suhardi, Bambang
INOTEKS: Jurnal Inovasi Ilmu Pengetahuan,Teknologi, dan Seni Vol 26, No 2 (2022)
Publisher : Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21831/ino.v22i2.12337

Abstract

Limbah pertanian (sekam padi, jerami padi, tongkol jagung, kulit singkong, rumput, dll) diproduksi dalam jumlah besar di Indonesia. Limbah pertanian dapat diubah menjadi bentuk energi melalui proses konversi termo mekanik. Proses pembuatan briket adalah pengubahan limbah pertanian menjadi briket berbentuk seragam yang mudah digunakan, diangkut, dan disimpan. Tujuan dari penelitian ini adalah untuk menentukan suhu dan kecepatan poros ekstruder ulir die berpemanas untuk pembriketan limbah pertanian. Sampel briket dibriket pada suhu 200, 300, 400o C dan kecepatan poros 30, 50, 100 rpm. Uji impak dilakukan untuk mendapatkan temperatur dan kecepatan poros yang sesuai untuk pembuatan briket limbah pertanian. Uji impak dilakukan dengan menjatuhkan sampel briket dari ketinggian 2 m ke lantai beton. Hasil pengujian menunjukkan bahwa temperatur briket dan kecepatan poros yang baik adalah 300o C dan 50 rpm.The impact test of heated die screw extruder on agricultural waste briquettingAgricultural wastes (rice husk, rice straw, corncob, cassava peel, grass, etc.) are produced in considerable quantities in Indonesia. Agricultural waste can be converted to a form of energy through the thermomechanical conversion process. The briquetting process is converting agricultural waste into uniformly shaped briquettes that are easy to use, transport and store. The present study aims to determine the temperature and the shaft speed of heated die screw extruder for briquetting agricultural wastes. Briquette samples were briquetted at the temperature of 200 o, 300 o, 400o C and shaft speeds of 30, 50, and 100 rpm. An impact test was conducted to obtain the temperature and shaft speed suitable for briquetting of agricultural wastes. The impact test was carried out by dropping a briquette sample from 2 m onto a concrete floor. The test results show an excellent briquetting temperature and shaft speeds are 300o C and 50 rpm.
Temperature and material flow in one-step double-acting friction stir welding process of aluminum alloy: Modeling and experimental Budiana, Eko Prasetya; Hapsari, Sekar Gading Happy; Mahmoud, Essam R. I.; Triyono, Triyono
Mechanical Engineering for Society and Industry Vol 5 No 1 (2025)
Publisher : Universitas Muhammadiyah Magelang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31603/mesi.12987

Abstract

Aluminum, known for its lower density compared to steel, is widely used in various applications. Welding is often required to form aluminum into technical structures. However, when fusion welding is used, it can lead to porosity in the weld. This occurs due to the significant difference in hydrogen gas solubility between liquid and solid aluminum, which traps hydrogen gas within the weld metal. Friction Stir Welding (FSW), a solid-state welding technique, has been proven to minimize porosity. However, for thick structures, FSW poses challenges, as welding must be done on both sides, increasing the welding time. To overcome this limitation, FSW has been modified into a one-step double-side FSW process, where two tools simultaneously work on both surfaces of the workpiece. This creates a unique condition with two heat sources and two stirring motion sources. To understand the temperature distribution and material flow in this process, modeling was conducted using Computational Fluid Dynamics (CFD). The upper and lower tools in the one-step double-side FSW process operate under identical conditions: a rotation speed of 1500 rpm, a welding speed of 30 mm/min, and a tilt angle of 0 degrees. The aluminum plate is treated as fluid, while the tools are considered solid in the model. The results of the temperature distribution modeling were validated against published studies, and the material flow was verified through macro- and microstructural observations of the cross-section. The validation showed that the model is accurate, with an error of only 4.07%.
Glow-Wire Analysis of Polypropylene Blends for Mechanical and Marine Engineering Applications Firdaus, Himma; Supono, Ihsan; Pratama, Anandito Adam; Istanto, Iwan; Prabowo, Aditya Rio; Kusnandar, Nanang; Kasiyanto, Iput; Wijaya, Rahman; Lailiyah, Qudsiyyatul; Budiana, Eko Prasetya; Yaningsih, Indri; Akbar, Hammar Ilham; Imanullah, Fahmi
Civil Engineering Journal Vol. 11 No. 7 (2025): July
Publisher : Salehan Institute of Higher Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28991/CEJ-2025-011-07-018

Abstract

Polymer materials are widely used due to their versatility; however, their vulnerability to fire is a significant concern, especially under electrical influences on engineered mechanical designs and marine structure applications. This study examines the fire resistance of a polypropylene (PP) blend using Glow-Wire Flammability Index (GWFI) and Glow-Wire Ignition Temperature (GWIT) tests. While previous research typically relies on flame-retardants to address flammability, this work proposes using a simple 1:1 weight ratio blend of two distinct PP types. This specific PP blend was selected to provide balanced material properties and improved processing consistency. The results from glow-wire tests were compared with previous findings to evaluate flammability performance. Our findings reveal that although the PP blend offers enhanced fire resistance compared to neat PP, it remains inferior to PP-containing flame-retardant additives. The outcomes suggest that this blended PP may be suitable for applications where mechanical properties, cost-effectiveness, and recyclability precede fire resistance, such as engineered automotive interiors, mechanical design of marine transportation, and low-risk electrical components in engineering infrastructure. This initial research contributes valuable insights into the fire behavior of PP blends. Moreover, it establishes a foundation for future investigations into polymer fire resistance, encouraging additional glow-wire testing on other polymer systems.
Structural design analysis of sandwich panels under axial compression load: Utilization of geometry and material variations Alifianto, Muhammad Daffa; Rohman, Hamdani Maftuh; Pratama, Anandito Adam; Istanto, Iwan; Prabowo, Aditya Rio; Melnyk, Oleksiy; Do, Quang Thang; Muttaqie, Teguh; Budiana, Eko Prasetya; Sohn, Jung Min; Wijaya, Rahman
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 22, No 3 (2025): October
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i3.75955

Abstract

This study aims to analyze the performance of sandwich cylindrical shell structures under axial compression load by varying the geometry and types of material. Numerical simulations were conducted using ABAQUS software, employing the finite element method (FEM) to evaluate von Mises stress, displacement, and energy absorption. The materials used include ASTM 1045, ASTM A36, and Mild Steel, with geometry designs varying across five different configurations. The simulation results indicate that the combination of material and geometry has a significant impact on the structural response of the sandwich cylindrical shell. ASTM 1045 exhibited the highest von Mises stress and displacement, indicating both high strength and substantial deformation, while Mild Steel demonstrated better elastic properties. Geometry 4 combined with ASTM 1045 proved to be the strongest configuration, while the combination of Geometry 1 and Mild Steel was the most elastic. This study contributes to the development of more efficient and impact-resistant ship structural designs. 
PENINGKATAN SARANA PENDUKUNG PENGOLAHAN MAKANAN PENDAMPING ASI SEBAGAI UPAYA PREVENTIF PENCEGAHAN STUNTING OLEH KOMINITAS SWEET BABY POKJA 4 TP PKK DESA KECAMATAN WEDI KABUPATEN KLATEN: Improving Supporting Facilities for Processing Complementary Foods for Breast Milk as a Preventive Effort to Prevent Stunting by the Sweet Baby Community, Working Group 4, TP PKK, Wedi District, Klaten Regency Budiana, Eko Prasetya; Hadi, Syamsul; Kristiawan, Budi; Septiyanto, Muhamad Dwi
Jurnal Abdikarya: Jurnal Karya Pengabdian Dosen Dan Mahasiswa Vol. 8 No. 02 (2025): Vol. 08 No. 02 Tahun 2025
Publisher : Lembaga Penelitian Dan Pengabdian Kepada Masyarakat Universitas 17 Agustus 1945 Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30996/.v8i02.11729

Abstract

Stunting merupakan masalah global yang berkembang dan terjadi diberbagai negara belahan dunia. Masalah kesehatan ini merupakan problem fundamental mendasar yang terjadi akibat adanya masalah kekurangan suplai gizi, protein dan lain sebagainya. Masalah tersebut menjadi perhatian khusus bagi Komunitas Sweet Babby Pokja 4 TP PKK Desa Pandes untuk menanggulangi masalah stunting. Kelompok ini memiliki kegiatan yang disebut dengan MP-ASI yaitu kegiatan menyediakan makanan pendukung ASI untuk bayi usia 0-2 tahun di wilayah Desa Pandes Kabupaten Klaten. Selain daripada menanggulangi isu kesehatan stunting komunitas Sweet Baby juga mennghidupkan kehidupan ekonomi dengan mendapatkan keuntungan dari penyediaan MP-ASI dan menerima pesanan makanan konsumsi untuk berbagai acara. Namun kendala yang dihadapi oleh Komunitas adalah penggunaan peralatan yang sederhana rumahan yang sangat terbatas untuk menerima pesanan dalam jumlah yang besar. Oleh sebab itu kegiatan pengabdian yang dilakukan oleh Universitas Sebelas Maret melalui Grub Riset Sustainable Thermofluids melakukan pengabdian ini sebagai bentuk daya dukung terhadap komunitas dan bentuk upaya pelaksanaan kegiatan Tri Dharma Peguruan Tinggi. Kegiatan berjalan dengan baik berupa penyerahan sarana prasarana serta pendampingan tenaga ahli berupa cooking class untuk pelatihan skill dan pengetahuan anggota komunitas tentang olahan makanan bergizi.