Dera, Nurmala Santi
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SIFAT FISIK MATERIAL PAPAN KOMPOSITE BERBAHAN SERAT TEBU DENGAN MATRIX RESIN POLYESTER Dera, Nurmala Santi; Kilo, Faisal; Talango, Novriyanti; Ishak, Sahional; Lestari, Wahyu Dwi
JURNAL ILMIAH MOMENTUM Vol 19, No 2 (2023)
Publisher : Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36499/jim.v19i2.9836

Abstract

Sugar cane fiber is an organic waste mostly produced by sugar factories in Indonesia such as in Gorontalo Province. If it is properly processed, it will have high economic value and will help the community’s economy during Covid 19 pandemic. This fiber, however, is easy to find, and it is not dangerous for human health. The important thing is that this fiber can be degraded naturally. Hence it can be used as composite reinforcing fiber which can help overcome environment problems. This study aimed at investigating the physical characteristics of natural fiber composite-based new material with characteristics and structures which can be used for automotive industry. The method applied in this study was by doing physical test such as density, water content, water absorption level, and thickness development with random-pattern treatments consisting of fraction variations of sugar cane fiber volumes of 10%, 30%, and 50% and fraction variations of resin volumes of 90%, 80%, and 70%. Each treatment consisted of 3 specimens with determined size, and they were tested in laboratory in order to find out the physical. Findings revealed that the highest density was in specimen 3 with fiber volume of 50% and resin volume of 70%, and the average value was 1.162 g/cm3. Meanwhile, the highest water content was specimen 1 with fiber volume of 10% and resin volume of 90% obtaining value of 0.51%. The water absorption level during 24 hours that obtained maximal result and value of 6.89% was specimen 2 with fiber volume of 30% and resin volume of 80%. The result for thickness development during 24 hours that obtained value of 10% was specimen 1 with fiber volume of 10% and resin volume of 90%. If it is validated with Indonesian National Standard, some of physical test results should be further formulated to get result based on Indonesian National Standard. Regarding the explanation, the fiber volume and resin volume fractions highly influenced the natural fiber (sugar cane fiber) composite-based new material making and it can be used for automotive industry.
Variasi Kemiringan Sudut Pengelasan SMAW terhadap Sifat Mekanis Material Baja SS400 Dera, Nurmala Santi; Saputro, Onesimus Kevin; Boli, Rahmad Hidayat
JURNAL ILMIAH MOMENTUM Vol 20, No 2 (2024): Vol 20, No 2
Publisher : Universitas Wahid Hasyim

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36499/jim.v20i2.12548

Abstract

Pengembangan teknologi di bidang konstruksi yang semakin maju tidak dapat dipisahkan dari pengelasan karena mempunyai peranan yang sangat penting. Tujuan penelitian ini adalah untuk mengetahui pengaruh variasi kemiringan elektroda pada pengelasan SMAW terhadap sifat mekanis baja SS400. Metode yang digunakan dalam penelitian ini adalah dengan melakukan pengujian eksperimen di laboratorium. Penelitian ini memvariasikan kemiringan elektroda yaitu 30°,45° dan 60° menggunakan mesin las SMAW (Shielded Metal Arc Welding) adapun hasil penelitian yaitu Nilai tegangan sudut kemiringan elektroda 30° σ =376,5 MPa, 45° σ = 382,90 MPa ,60° σ =411,9 MPa, nilai rata-rata regangan e=16,67 % dan nilai rata-rata modulus elastisitas yang tinggi terdapat pada pengelasan 30° dengan nilai σ=140.053 MPa. Tegangan dan regangan sangat dipengaruhi oleh sudut kemiringan elektroda karena terkait dengan distribusi panas dan penetrasi las