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All Journal Jurnal Teknik Mesin Indonesia Mekanika: Majalah Ilmiah Mekanika
Wijang Wisnu Raharjo
Universitas Sebelas Maret
Aerospace Engineering Automotive Engineering Control & Systems Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Pengaruh Pemaparan Cuaca Terhadap Kekuatan Impak Komposit rHDPE Berpenguat Serat Pelepah Salak Mas'ud Nur Hanif; Dody Ariawan; Wijang Wisnu Raharjo
Mekanika: Majalah Ilmiah Mekanika Vol 19, No 2 (2020): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v19i2.43204

Abstract

Tujuan dari penelitian ini adalah untuk mengetahui pengaruh pemaparan cuaca terhadap kekuatan impak dari komposit rHDPE - serat pelepah salak. Fraksi volume pada komposit adalah 30%. Spesimen dibuat menjadi 3 variasi, yaitu spesimen rHDPE murni sebagai spesimen kontrol, komposit rHDPE berpenguat serat pelepah salak dengan perlakuan alkali, dan komposit rHDPE berpenguat serat pelepah salak tanpa perlakuan alkali. Pemaparan cuaca dilakukan selama 6 bulan. Untuk mengetahui kerusakan mikroskopis spesimen, pengamatan menggunakan Scanning Electron Microscopy (SEM) dilakukan. Setelah 6 bulan pemaparan cuaca, hasil pengujian menunjukkan bahwa perlakuan alkali hanya berpengaruh sebelum pemaparan cuaca. Sedangkan setelah dipaparkan cuaca, hasil antara komposit dengan perlakuan dan tanpa perlakuan alkali menunjukkan kesetaraan.
Pembuatan masker aerator untuk atlet difabel sebagai pencegahan hypoxia saat latihan di masa pandemi COVID-19 Faiz Nur Fauzi; Diasdamara Fakhri Nugroho; Rizqi Husain Alfathan; Wijang Wisnu Raharjo; Bambang Kusharjanta; Ubaidillah
Jurnal Teknik Mesin Indonesia Vol. 17 No. 2 (2022): Jurnal Teknik Mesin Indonesia
Publisher : Badan Kerja Sama Teknik Mesin Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36289/jtmi.v17i2.383

Abstract

During the current COVID-19 pandemic, we are encouraged to always obey health protocols. One of them is to use a mask. The use of masks on athletes, especially athletes with disabilities has a bad impact on the athlete's body itself. Because in the course of training, the athletes will do heavy work that requires adequate oxygen supply. In this case, the mask can reduce the athlete's respiratory effectiveness due to hypoxia. Hypoxia is a condition in which the body lacks oxygen levels. To prevent hypoxia in athletes who must continue to carry out training with the COVID-19 health protocol is to use a mask that can regulate air circulation properly. Therefore, an idea emerged to make an aerator mask that can help the respiratory system and can prevent athletes from getting hypoxia during training during a pandemic, because the aerator mask that we made is equipped with dual fans that can supply oxygen properly. Thus, athletes can exercise without fear of experiencing hypoxia disorders and remain compliant with health protocols.
Effect of Holding Time and Temperature of Hot Pressing on Tensile Strength of Biodegradable Plastic Made of Carrageenan Fitrian Imaduddin; Palgunadi Sastra; Wijang Wisnu Raharjo; Putri Wullandari; Ridwan Ridwan
Mekanika: Majalah Ilmiah Mekanika Vol 21, No 2 (2022): MEKANIKA: Majalah Ilmiah Mekanika
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/mekanika.v21i2.64292

Abstract

The most significant environmental problem was caused by plastic. One way to handle plastic waste was using biodegradable plastic because it faster decomposes naturally. Biodegradable plastic can be made from carrageenan by the hot press method. This method can make biodegradable plastic with large dimensions. However, the plastic quality depended on the holding time, temperature, and pressure selected during the hot pressing process. Therefore, this research is conducted to determine the effect of holding time and temperature in the hot press process on the tensile strength of biodegradable plastic made from carrageenan. The composition of the biodegradable plastic material used was 35% carrageenan, 35% polyvinyl alcohol (PVA), and 30% glycerol. In the manufacture of composites, the holding time was varied: 10, 20, 30, and 40 minutes, as well as the process temperature varied from 100, 110, 120, and 130 °C. The tensile strength of the composite was observed through tensile testing using a Universal Testing Machine. FTIR, XRD, and SEM tests were also conducted to sharpen the analysis. The addition of holding time led to an increase in the tensile strength of biodegradable plastics. The highest tensile strength was obtained at a holding time of 30 minutes with a value of 4.45 MPa. After 30 minutes, the tensile strength of the biodegradable composite decreased. Meanwhile, the addition of process temperature caused a decrease in the tensile strength of biodegradable plastics. The highest tensile strength was obtained at a process temperature of 100 °C with a value of 5.28 MPa.
Co-Authors Bambang Kusharjanta Diasdamara Fakhri Nugroho Dody Ariawan Faiz Nur Fauzi Fitrian Imaduddin Mas'ud Nur Hanif Palgunadi Sastra Putri Wullandari R. Ridwan Rizqi Husain Alfathan Ubaidillah Ubaidillah