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All Journal Jurnal Teknik ITS Journal of Science and Applicative Technology International Journal of Marine Engineering Innovation and Research JAMETECH Logic : Jurnal Rancang Bangun Dan Teknologi
Risa Nurin Baiti
Politeknik Negeri Bali
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Journal : JAMETECH

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Perancangan mekanisme rel torch plasma cutting 1 (satu) Axis I Wayan Suma Wibawa; I Komang Kantun; I Ketut Suherman; Risa Nurin Baiti; I Wayan Suirya
Journal of Applied Mechanical Engineering and Green Technology Vol. 3 No. 1 (2022): March 2022
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (515.479 KB) | DOI: 10.31940/jametech.v3i1.8-12

Abstract

Plasma cutting is a method of cutting metal, especially steel, with relatively low cost and effectiveness, with satisfactory results. Where in the cut, it is enough to need a plasma cutting machine/inverter that is quite affordable, widely available in the market, and simple tools, an air compressor (no special oxygen/gas needed as in gas/oxygen and acetylene/LPG cutting), a power source, the material being cut and the cutting process can be carried out. How to use plasma cutting is relatively easy, namely by setting the machine and then directing the plasma torch to the cutting plane as needed by maintaining a stable movement and height. However, when we make repeated cuts, our concentration and physical strength will automatically decrease, so we need a tool that can help us direct/adjust the plasma torch, which is called a plasma cutting mechanism. After paying attention to these needs, a plasma cutting mechanism was designed with a working space/cutting length of 1200 mm, with a tool size of 1400 mm x 300mm x 200 mm length, width and height, estimated cost of Rp. 3,050,000,-, with a cutting speed setting of 100 mm/minute to 1000 mm/minute, a cutting height of 0 to 10 mm with an angle of 0 degree to 90 degree.
Studi Komparatif Komposit Berpenguat Serat Agel yang Diberi Perlakuan Kimia Menggunakan Pembebanan Lentur Asana, I Wayan Padma Yogi; Widantha, Komang Widhi; Baiti, Risa Nurin
Journal of Applied Mechanical Engineering and Green Technology Vol. 4 No. 1 (2026): April
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/jametech.v4i1.40-45

Abstract

Natural fiber composites are increasingly explored as sustainable alternatives to synthetic fiber composites because of their renewable character, lower environmental impact, and potential for biodegradable applications. However, the hydrophilic nature of natural fibers often causes poor adhesion with polymer matrices and reduces mechanical performance. This study investigated the effect of NaOH and citric acid surface treatments on Agel fiber-reinforced composites fabricated by the hand layup method, with flexural bending strength as the main response. Three composite groups were prepared, untreated Agel fiber, NaOH-treated Agel fiber, and citric acid-treated Agel fiber. The specimens were cut and tested in bending, and the results were analyzed using normality testing, equal variance testing, one-way ANOVA, and Tukey pairwise comparison.The average flexural bending strengths of the untreated, citric acid-treated, and NaOH-treated composites were 36.922 MPa, 37.784 MPa, and 40.611 MPa, respectively. The statistical assumptions for parametric analysis were satisfied, with the data in each group showing normal distribution and equal variance confirmed. One-way ANOVA indicated a significant difference among the three groups (F = 7.24, p = 0.005). Tukey pairwise comparison showed that the NaOH-treated composite was significantly different from both the untreated composite (p = 0.005) and the citric acid-treated composite (p = 0.031), while the difference between untreated and citric acid-treated composites was not significant (p = 0.678).These results indicate that NaOH treatment is more effective than citric acid treatment in improving the flexural performance of Agel fiber composites under the conditions used in this study. The improvement is attributed to better fiber to matrix interfacial bonding caused by surface modification of the fiber. This study supports the potential of Agel fiber as a sustainable reinforcement material for composite applications.
Co-Authors Alfanda, Benedicta Dian Amadeus Renaldy Ardhyananta, Hosta Ariani, Silvi Astri Aulia Suwanda Azizul Fikri Dhika Aditya Purnomo Faiza Armalia Putri Fajar Aditya Julyatmojo I Ketut Suherman I Komang Kantun I Putu Gede Sopan Rahtika I Wayan Padma Yogi Asana I Wayan Suirya I Wayan Suma Wibawa Kiki Dwi Wulandari Komang Widhi Widantha Made Widnya Kusuma Muhammad Saeful Fadlan Muhammad Yasin Siregar Primaningtyas, Widya Emilia Purnomo, Dhika Aditya Rio Ardiansyah Murda Sena Maulana Silvi Arianti Sipahutar, Wahyu Solafide Wahyu Sipahutar Wulandari, Kiki Dwi