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All Journal Mechatronics, Electrical Power, and Vehicular Technology Mesin Jurnal Sains Materi Indonesia
Mardiyati, Yati
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Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Optimasi Parameter Pencetakan dan Evaluasi Sifat Mekanis Filamen Poliuretan Termoplastik dalam Pencetakan 3D Delima, Hastuti; Mardiyati, Yati; Andami, Helmina; Steven, Steven; Rizkiawan, Sandi
Mesin Vol 30 No 2 (2025)
Publisher : Faculty of Mechanical and Aerospace Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2025.30.2.2

Abstract

Termoplastik poliuretan (TPU) merupakan salah satu jenis polimer termoplastik yang saat ini sangat menarik perhatian pengguna mesin pencetakan 3D. Filamen TPU memiliki sifat elastis, kekuatan tarik dan ketahanan terhadap benturan yang baik sehingga sangat potensial untuk digunakan dalam proses pembuatan produk pada berbagai aplikasi. Walaupun demikian, dikarenakan sifat elastisnya, proses pencetakan TPU dinilai cukup sulit sehingga perlu dilakukan kajian untuk mengidentifikasi kecepatan cetak, kecepatan retraksi, temperatur cetak, dan jarak retraksi optimum untuk mencetak filamen TPU. Dalam penelitian ini, dilakukan kajian terkait penentuan parameter cetak optimum untuk mencetak filamen TPU. Parameter cetak optimum yang diperoleh kemudian digunakan untuk mencetak sampel pengujian tarik. Pengujian tarik pada sampel yang dihasilkan dilakukan dengan mengacu pada ASTM D 638-14. Berdasarkan hasil penelitian yang dilakukan, temperatur cetak, kecepatan cetak, jarak retraksi dan kecepatan retraksi optimum untuk mencetak filamen TPU adalah sebesar 230°C, 40 mm/s, 1 mm, dan 40 mm/s secara berturut-turut. Sampel yang dicetak dengan arah 0 memiliki kekuatan tarik yang lebih tinggi dibandingkan dengan spesimen yang dicetak dengan arah 90°.
Development of styrene butadiene rubber-butadiene rubber with a hyperelastic model for vehicle tire design Rachmat, Angki Apriliandi; Ramadhan, Muhammad Hisyam; Mardiyati, Yati; Suweca, I Wayan; Dirgantara, Tatacipta
Journal of Mechatronics, Electrical Power, and Vehicular Technology Vol 16, No 1 (2025)
Publisher : National Research and Innovation Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/j.mev.2025.1201

Abstract

This paper proposes a mathematical correlation between styrene butadiene rubber (SBR)-butadiene rubber (BR) composition and hyperelastic model parameters for numerical studies in vehicle tire design. Experimental, numerical, and curve-fitting methods were employed in this research. Experimental tests were conducted using tensile tests for SBR-BR. The numerical study of the SBR-BR tensile test was carried out using several classic hyperelastic models. The best hyperelastic model was selected based on the smallest deviation between numerical and experimental results. Curve-fitting was done between the best hyperelastic model parameters and the compound to obtain a new correlation, and it was validated. This research shows that the neo-Hookean model with 6 % deviation is the most suitable for the SBR-BR, and the mathematical correlation for SBR-BR composition and C10 is linearly correlated. SBR60 %-BR40 % shows the optimum composition for non-pneumatic tires with the characteristic of maximum tensile strength 16.71 MPa, elongation 251 %, and 200 % modulus 13.04 MPa.
KAJI NUMERIK GROUND PAD SHOE KENDARAAN TEMPUR DENGAN MODEL MATERIAL HYPERELASTIC Rachmat, Angki Apriliandi; Dirgantara, Tatacipta; Suweca, I Wayan; Mardiyati, Yati
Mesin Vol 30 No 1 (2024)
Publisher : Faculty of Mechanical and Aerospace Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.2024.30.1.5

Abstract

One of the important components on a combat vehicle is the ground pad shoe (GPS) or track pad. GPS that has been developed at this time mostly uses rubber material. Rubber raw materials themselves are found in Indonesia in large amount. Indonesia left 3 million tonnes of natural rubber unprocessed in 2018. On the other hand, natural rubber research is quite expensive and takes a long time to become a product. To make rubber products is needed special molds and tests. To solve the high costs and long time involved in rubber research, it is necessary to carry out numerical research. In this study, a numerical study of GPS rubber for combat vehicles was carried out with a hyperelastic material model. The research was conducted experimentally and numerically. Tensile testing is carried out on imported GPS samples which are then used as comparison data for numerical studies. The Mooney-Rivlin, Neo-Hookean, Yeoh, and Ogden hyperelastic models were varied to get the stress and strain values ​​closest to the experimental test. The results of the numerical study show that the best hyperelastic model for the imported GPS rubber model is the Neo-Hookean model. The tensile strength of GPS according to the experimental tensile test results is 16.93 MPa, while the result of the finite element method (FEM) is 16.75 MPa. The GPS modulus 200% according to the experimental tensile test results is 14.7 mm/mm, while the FEM result is 15.3 mm/mm. The difference between the FEM and experimental test values ​​for tensile strength and modulus 200% are below 5%. Maximum stress on GPS is 4,4 MPa and safety factor 3,8.
Synthesis and Characterization of Biocompatible Facial Sheet Masks Utilizing Ginger Cellulose and Jicama Starch Nisazarifa, Adristi; Mardiyati, Yati; Steven, Steven
Jurnal Sains Materi Indonesia Vol. 27 No. 2 (2026): Jurnal Sains Materi Indonesia
Publisher : BRIN Publishing (Penerbit BRIN)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/jsmi.2026.13109

Abstract

Sheet masks are one of the most widely used beauty products to improve skin health. The increase in sheet mask usage leads to an increase in its waste, while some of the sheet masks contain synthetic fibers that are not biodegradable in the environment. Many researchers have been interested in innovating sheet masks by using natural polymer materials. Starch and cellulose were chosen because they are potentially environmentally friendly and biocompatible products. The solution casting method is used to produce sheet masks. Ginger cellulose and jicama starch were mixed, and the mass ratios of cellulose and starch are 100:0, 100:20, 100:40, 100:60, and 100:80. The addition of starch to cellulose tends to decrease the tensile strength and increase the percent elongation of the sample. The sample with a 100:0 ratio had the highest tensile strength at 34.75 MPa, while the highest percent elongation was achieved by the sample with a 100:40 ratio, measuring 4.80%. The absorption index of the sample to serum decreased with increasing starch composition. Samples with a mass ratio of cellulose to starch of 100:0, 100:20, and 100:40 exhibited better biodegradability than commercial sheet masks. Most of the samples undergo 100% biodegradation after 12 days of the biodegradation test. This research aims to develop a sheet mask made from ginger cellulose and jicama starch, which has flexible properties that allow it to conform to the shape of the face while also effectively absorbing serum or essence. This research can be used as an alternative for choosing sheet mask materials as a way to reduce plastic waste.
Co-Authors Andami, Helmina Delima, Hastuti I Wayan Suweca Nisazarifa, Adristi Rachmat, Angki Apriliandi Ramadhan, Muhammad Hisyam Rizkiawan, Sandi Steven Steven Tatacipta Dirgantara, Tatacipta