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Pengaruh Thermal Shock Terhadap Kekuatan Tarik dan Bending KompositResinBerpenguat Serat Rami Rozi Saferi; Hendery Dahlan; Mulyadi Bur Mulyadi Bur
Jurnal Energi Dan Manufaktur Vol 8 No 2 (2015): Oktober 2015
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak:Perkembanganteknologi komposit saat ini sudah mulai mengalami pergeseran, dari bahan komposit berpenguat serat sintesismenjadi bahan komposit berpenguat serat alam. Serat alam rami (Boehmeria Nivea) memiliki peluang untukdikembangkan sebagai media penguatan pada resin polimer. Tujuan dari penelitian ini untuk mengetahui perubahan kekuatan tarik dan bending kompositresinberpenguat serat ramiakibat pengaruh lingkungan. Dalam penelitian ini digunakan serat ramipintalan dengan diameter 1.5 mm yang ditenun manual dan matriks polyester jenis resin bening.. Fraksi volume serat dan resin yang digunakan9% dan 91%.Tenunan serat divariasikan baik dengan perlakuan NaOH 20% maupun tanpa perlakuan alkali. Komposit dipanaskan di dalam oven listrik pada temperatur 1000C selama 1 jam, kemudian dilakukan pendinginan dengan merendam komposit pada ????????2???????? dengan variasi siklus thermal shock 5, 10, 15, dan 20. Spesimen uji tarik dan uji bending dibuat berdasarkan ASTM D638 dan ASTM D790-03.Hasil penelitian menunjukkan Kekuatan tarik dari komposit resin berpenguat serat rami dengan perlakuan NaOH 20% rata-rata turun 25,66 % dari kekuatan tarik maksimum sebesar 38.4 MPa dan turun 24.51% dari kekuatan tarik maksimum sebesar 29.08 MPa untuk serat tanpa perlakuan NaOH akibat perlakuan thermal shock. Kekuatan bending dari komposit resin berpenguat serat rami dengan perlakuan NaOH mengalami penurunan rata-rata 14.14 % dari kekuatan bending maksimum sebesar 75.08 MPa dan mengalami penurunan 17.34% dari kekuatan bending maksimum sebesar 49.57 MPa untuk serat tanpa perlakuan NaOH akibat pengaruh thermal shock.Bentuk patahan spesimen komposit setelah diberikan perlakuan thermal shock menunjukkan semakin getasnya stuktur dari komposit dan semakin rapuhnya serat rami baik dengan maupun tanpa perlakuan NaOH Kata Kunci: Komposit, rami, thermal shock, sifat mekanik.Abstract:The recent composite technology has changed from synthetic to natural fibre-reinforced composite. Natural fibre Boehmeria Nivea (rami) is one of the promising reinforced medium to polymer resin. The objective of the present work is to investigate the tensile and bending strengths of the boehmeria nivea fibre-reinforced resin composite. The present research used a 1.5 mm diameter of woven boehmeria nivea fibre and a transparent resin of polyester matrix. The volume fraction of the fibre and resin were 9% and 91%, respectively. The woven fibre was varied with 20% NaOH and without alkali treatment. The composite was heated in electrical oven at 1000 oC during 1 hour, and then cooled by immersing the composite in the water at various cycle of thermal shock 5, 10, 15, and 20, respectively. The specimen for tensile and bending test was made according to ASTM D638 and ASTM D790-03. The results showed that the tensile strength of the boehmeria nivea fibre-reinforced composite with NaOH 20% treatment decreased 25,66% by average from the maximum tensile strength 38.4 MPa. Meanwhile the tensile strength that of without NaOH treatment decreased 24,51% from the maximum tensile strength 75,08 MPa. Those of bending strength of the tested composite also decreased 14,14% from the maximum value 75,08 MPa; and decreased 17,34% from the maximum bending strength 49,57 MPa, respectively. The fracture shape of the specimen showed both the brittle structure of the composite and the fragile fibre on both with and without treatment. KeyWords: Composite, rami, thermal shock, mechanical properties
Toughness and Fracture Surface of Frame of Drone Based on Composite from Waste Materials Mastariyanto Perdana; Rozi Saferi; Putri Pratiwi
Jurnal Teknik Mesin (JTM) Vol 9, No 2 (2019)
Publisher : LP2M - Institut Teknologi Padang

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Abstract

Application of green composites material is aerial egineering. Advantages of green composites material are lightweight and relatively strong. This reason that makes green composites can be applied in Unmanned Aerial Vehicle (UAV). In this study, material of quadcopter frame was composites material that made of waste material from styrofoam, bagasse and eggshell. Styrofoam was used as binder of composite material. Bagasse and eggshell was used as reinforcement in green composite material. The investigation focused on effect of volume fraction on flying time of quadcopter that made of green composites material. This study showed that addition of eggshell powder in composites up 25% by volume fraction, result in decreasing the flying time of quadcopter. Addition of eggshell powder in composites up 25% by volume fraction,  result in decreasing the porous of green composite. Porous structure affect the flying time of quadcopter based on green composite materials that made of waste material from styrofoam, bagasse and eggshell. Green composite based on styrofoam, bagasse and eggshell can be applied in Unmanned Aerial Vehicle (UAV) materials.
Design Development of Rice Transplanter with Quality Function Deployment Method Rozi Saferi; Asmara Yanto; Anton Bintarnel
Jurnal Teknik Mesin Vol 12 No 1 (2022): Jurnal Teknik Mesin Vol.12 No.1 April 2022
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LP2M) - ITP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21063/jtm.2022.v12.i1.51-60

Abstract

Today's agricultural development is inseparable from the development of agricultural tools and machinery technology. The application of this technology can be in the form of mechanization technology for rice cultivation using a rice transplanter. With the technology that helps them, it is hoped that agricultural productivity in Indonesia will increase from year to year and the farmers who are generally elderly can work more easily in managing their fields. The purpose of this study is to identify and determine the level of consumer needs related to rice transplanter, determine the technical characteristics of rice transplanter based on consumer preferences, and develop a House of Quality (HOQ) to determine the dominant design requirements and the priority technical characteristics of the equipment. Based on the House of Quality (HoQ) diagram, the best priority in improving the quality of products for making rice transplanter is an easy-to-use tool with a value of 138 with an average of 4.60. On the other hand, farmers also need a tool that can speed up rice planting on the condition that it is easy to use, because the suitability and convenience of rice farmers is a top priority. Furthermore, the design of the tool with a price that is not too expensive has a weight of 136 with an average of 4.53. This also shows that the price component is a priority for farmers to choose a rice transplanter.