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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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (780.674 KB)

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
IMPLEMENTASI TEKNOLOGI WASTAFEL TANPA SENTUH DI RUMAH SAKIT KOTA PADANG DALAM RANGKA MEMUTUS MATA RANTAI COVID-19 Zaini Zaini; Syarkawi Syamsuddin; Wisnu Joko Wulung; Purnawan Purnawan; Hendery Dahlan; Wisnel Wisnel; Denny Herald
Jurnal Hilirisasi IPTEKS Vol 3 No 4 (2020)
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jhi.v3i4.466

Abstract

The public's lack of concern for health protocols is directly proportional to the increase in the number of people affected by the Covid-19 virus. This condition worsens when public facilities such as available hand washing equipment tend to be less hygienic because there is still physical contact during the hand washing process, so there is a great potential risk of spreading the Covid-19 outbreak in the community en masse. Therefore an innovation was made in the form of a touchless hand washing device equipped with sensors to replace the function of water taps and manual liquid soap containers. The target audience of this activity is the people in the hospital environment of Padang City. This activity is carried out in two stages, namely the first stage to design tools and the second stage in the form of procurement of tools as well as outreach to the people of Padang City who visit the hospital regarding the introduction and how to use hand washing tools without touch as well as demonstrating to the community with the assistance of the hospital about how to wash hands properly and correctly according to health protocols.
IMPLEMENTASI PENGGUNAAN APLIKASI ANDROID SEBAGAI SELF-ASSESSMENT DAN MEDIA INFORMASI COVID-19 DI PUSKESMAS DADOK DAN KELURAHAN KAMPUNG LAPAI NANGGALO KOTA PADANG Trisfa Augia; Mery Ramadani; Hendery Dahlan; Rizki Ridhatul Tani; Fauziah Fauziah
Jurnal Hilirisasi IPTEKS Vol 3 No 4 (2020)
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jhi.v3i4.476

Abstract

Coronavirus Disease 2019 (COVID-19) is an infectious disease caused by Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2). SARS-CoV-2 is a new type of coronavirus that has never been previously identified in humans. Indonesia reported its first case of COVID-19 on March 2, 2020 and the number continues to grow until now. Until October, 15 2020 the Ministry of Health reported 349,160 confirmed cases of COVID-19 with 12,268 deaths. The COVID-19 Self-Assessment application can help screening of individual and health workers to accelerate case finding and make it easier for health workers to provide curative efforts. Socialization of the COVID-19 Self-Assessment Application in coordination with the Public Health Center Dadok Tunggul Hitam and Kelurahan Kampung Lapai. Activities included introduction, installation, implementation, and monitoring and evaluation of application usage. Participants installed the application on an Android device and implemented the application enthusiastically. It is hoped that this application can make it easier for community to access information related to COVID-19 and carry out screening independently.