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All Journal Jurnal Teknik Mesin Indonesia Mekanika: Majalah Ilmiah Mekanika Prosiding SNTTM
Wijang Wisnu Raharjo
Universitas Sebelas Maret
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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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

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 hotpressing 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, and 30% glycerol. The tensile strength of the composite was observed through tensile testing using a universal testing machine. fourier-transform infrared spectroscopy, X-ray Diffraction (XRD), and Scanning Electron Microscopy (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.
Impact of ply arrangement on the mechanical properties of luffa cylindrica/fiberglass reinforced polyester hybrid composites Wijang Wisnu Raharjo; Ardhana Yossa Aulia; Wibowo
Prosiding SNTTM Vol 23 No 1 (2025): SNTTM XXIII October 2025
Publisher : BKS-TM Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.71452/kep5fv78

Abstract

Hybrid composites are engineering materials that combine two types of reinforcing fibers to achieve superior mechanical properties. The study aims to evaluate the effect of fiber layer arrangement on the flexural strength and impact toughness of hybrid composites based on unsaturated polyester resin (UPRs) reinforced with Luffa cylindrica fibers and fiberglass. Five types of stacking configurations were tested: Luffa–Luffa (LC-LC), Luffa–chopped strand mat (LC-CSM), chopped strand mat–Luffa (CSM-LC), Luffa–woven roving (LC-WR), and woven roving–Luffa (WR-LC). Flexural testing was conducted according to ASTM D790, while impact testing followed the Izod method based on ASTM D5941. The results show that the LC-WR configuration achieved the highest flexural strength of 107.723 MPa, whereas the WR-LC configuration yielded the highest impact strength of 50.49 kJ/m². Placing the fiberglass layer on the tensile side significantly increased flexural strength, while its placement on the compressive side demonstrated superior impact energy absorption. These findings underscore the critical role of fiber stacking sequence in determining the mechanical properties of hybrid composites, which can be optimized based on specific structural application requirements.
Co-Authors Ardhana Yossa Aulia 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 Wibowo