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All Journal Jurnal Teknik Mesin Rotasi Jurnal Teknologi Jurnal Mechanical Media Mesin: Majalah Teknik Mesin VANOS Journal of Mechanical Engineering Education Journal of Science and Applicative Technology Metal Indonesia JURNAL CRANKSHAFT Infotekmesin STEAM Engineering : Journal of Science, Technology, Education And Mechanical Engineering J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin Journal of Metallurgical Engineering and Processing Technology Journal of Mechanical Engineering Journal of Applied Mechanical Technology (JAMET) Jurnal Foundry Journal of Sciencce Technology and Visual Culture
Fajar Paundra
Institut Teknologi Sumatera
Aerospace Engineering Arts Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Journal : Rotasi

 1 
Effect of Webbing Angle on Tensile and Bending Strengths in Human Hair Fiber Reinforced Composites Paundra, Fajar
ROTASI Vol 24, No 1 (2022): VOLUME 24, NOMOR 1, JANUARI 2022
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.24.1.30-35

Abstract

Composite is a combination of two or more materials that have different basic properties. This study aims to analyze the effect of woven angle on hair fiber composites on tensile and bending strength. The composite is composed of polyester resin and human hair waste. Hair was soaked in 5% NaOH solution for 1 hour and woven with angle orientation 0°/90°, 15°/105°, 30°/120° and 45°/135°. The process of making composites is made by the Compression Molding method for 24 hours. After making the composite, a density test was carried out with the ASTM C271 standard, tensile test with ASTM D3039 standard and bending test with the ISO 178 standard. The results of the density test obtained an increase in the density value with the lowest density value of 0.82 g/ml and the highest 0.85 g/ ml to produce a lighter composite. Then the tensile test results show the highest tensile strength value of 16.47 MPa which occurs at an angle of 0°/90°. The results of the bending test obtained an increase in bending strength with the highest bending strength value of 47.1 MPa which occurred at an angle of 0°/90°.
The Effect of Pressure Variations on the Characteristics of Coconut Shell Based Briquettes Using Tapioca Starch Adhesive Devia Gahana Cindi Alfian; Marone J Tambunan; Fajar Paundra; Dicky J Silitonga; Lathifa Putri A; Muhammad Syaukani
ROTASI Vol 25, No 3 (2023): VOLUME 25, NOMOR 3, JULI 2023
Publisher : Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/rotasi.25.3.23-32

Abstract

The very limited availability of energy on this planet is one of the main problems that concerns almost all countries. The presence of emergency energy indicates that energy usage is very high. Therefore, encouraging the use of new and sustainable energy sources is of utmost importance. Biomass energy can be the answer to overcoming the limitations of decreasing fossil assets, especially through the production of charcoal briquettes. Biomass energy is derived from plants or easily traceable natural materials that are abundant, such as wood waste, rice husks, bagasse, and coconut shells. Coconut shells, for example, can be a primary ingredient for making charcoal briquettes, using tapioca flour or starch as an adhesive. The briquettes can be produced using pressure variations of 50 kg/cm², 60 kg/cm², and 70 kg/cm², with a drying temperature of 100°C for 3 hours. The recommended ratio for making charcoal briquettes is 3 parts coconut shell to 1 parts tapioca flour adhesive. The purpose of this study is to compare the briquettes produced with coconut shell and tapioca flour adhesive to the SNI Briquette standard No.1/6235/2000. For the conducted tests, the results were as follows: the water content was 6.06%, the ash content was 5.9695%, the carbon content was 43.5946%, and the calorific value was 34,182.6808 calories. Additionally, the substance score yield was 26.845%, and the combustion rate was 0.12179 g/minute.
Co-Authors A. Juan Abdu Halim Wibowo Abdul Aziz Abdul Muhyi Abdul Muhyi Ahmad Waldi Chaniago Amelia Oktavia Anas Maulana Andi Rahadiyan Wijaya Danang Istanto Devia Gahana Cindi Alfian Dicky J. Silitonga Dimas Aldyansyah Dimas Maulana Aji Duwi Hariyanto Eko Pujiyulianto Eko Pujiyulianto Eko Pujiyulianto Fajar Perdana Nurrullah Febri Budi Darsono Febryan Utama Putra Felderico Andreas Sitanggang Firman Sri Bagaskara Firman Sri Bagaskara Fuad Hakim Fuad Mulkan Al Machzumy Gigih Tujo Pradibyo H.T. Yudhistira Hadi Teguh Yudistira, Hadi Teguh Hamid Abdillah Handoyo Handoyo Hasan Bisri Bisri I Gusti Bagus Budi Dharma Ilham Ramadhan Siregar Ilhan Manzeis Imam Prabowo Imam Prabowo Indriyani Indriyani Jukepri Brain Meliala Kisna Pertiwi Lathifa Putri A Lukman Triawan M. Fahan Sidik M. Muhibbul Khairi M. Rafi Kurniawan Marone J Tambunan Mufidah, Zunanik Muhamad Fatikul Arif Muhammad Ichsanudin Muhammad Rama Aditya Muhammad Rizky Hikmatullah Muhammad Syaukani Muhsin Muhsin Muhsin Nurdin, Akhmad P. Elmiawan P. Yunesti Puguh Elmiawan Puguh Elmiawan Puguh Elmiawan Putty Yunesti Sabar Sastra Kusuma Wijaya Sri Hastuti Syamsul Hadi Hadi Triyono Triyono Zian Millenio