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All Journal Jurnal Furnace Jurnal Inovasi Teknologi Terapan Jurnal Polimesin
Alhamidi, Ahmad Ali
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Agriculture, Biological Sciences & Forestry Automotive Engineering Computer Science & IT Control & Systems Engineering Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Pengaruh Perlakuan Panas Quench Temper dan Aniling Ganda Terhadap Sifat Mekanik Dan Struktur Mikro Baja Tahan Karat Ultra Tipis Pada Aplikasi Elektronik dan Biomedis Aziz, Abdul; Partuti, Tri; Hasanah, Indah Uswatun; Alhamidi, Ahmad Ali; Suryana, Suryana; Maulana, Alief
Jurnal Furnace Vol 7, No 1 (2024)
Publisher : Program Studi Teknik Metalurgi, Universitas Sultan Ageng Tirtayasa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36055/furnace.v1i1.27538

Abstract

Sifat mekanik dan perubahan struktur mikro terjadi pada baja tahan karat (BTK) ultra tipis jenis SUS 316 di pelajari setelah diberi perlakuan panas quench temper 900oC, aniling ganda pada suhu 400oC pada BTK ultra tipis dan ditahan selama 1, 2 dan 3 jam. Percobaan dilaksanakan pada BTK butir halus dan berbutir kasar. Dari hasil pengamatan dengan mikroskop elektron SEM -EBSD, tidak terjadi transformasi fasa martensit pada struktur mikronya. Perubahan struktur mikro terjadi dalam bentuk perubahan sebaran grain misorientation (GMO) pada baja SUS 316 ultra tipis. Nilai kekerasan pun mengalami peningkatan dengan peningkatan waktu tahan dan ini pastinya berhubungan erat dengan surfaceroughening pada baja ultra tipis tersebut dan mampu bentuk pada baja ultra tipis. Selain itu ditemukan bahwa nilai surface roughening menurun seiring dengan meningkatnya waktu tahan pada baja ultra tipis.
Evaluation of acoustic and physical properties of composite boards from sugarcane bagasse and oil palm waste Sunardi, Sunardi; Wahyudi, Riyanto; Ula, Shofiatul; Haryadi, Haryadi; Alhamidi, Ahmad Ali
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6618

Abstract

Sugarcane bagasse and oil palm Empty Fruit Bunches (EFB) are abundant agricultural by-products in Indonesia that, if unmanaged, pose significant environmental risks. This research investigates their potential as sustainable raw materials for composite acoustic boards. Composites were fabricated using hybrid fibers consisting of 67% bagasse and 3% EFB, bonded with a matrix of Polyvinyl Acetate (PVAc) and varying ratios of epoxy resin (0%, 1%, 2%, and 4%). Boards were cold-pressed at 20 MPa for 30 minutes and air-dried for 7 days. The incorporation of epoxy resin significantly improved physical integrity and acoustic performance. Sound Absorption Coefficients (SAC) increased from 0.37 (0% epoxy) to 0.67 (4% epoxy), indicating enhanced absorption in mid-to-high frequency ranges. These results support the feasibility of utilizing agricultural waste for sustainable engineering applications, thereby contributing to the development of eco-friendly materials.
Pengaruh Kandungan Partikel Cangkang Telur Terhadap Kekerasan dan Kekuatan Lentur Komposit Epoksi Setelah Paparan Panas Pranata, Anugrah Surya Arya; Ula, Shofiatul; Saefuloh, Iman; Sudrajad, Agung; Alhamidi, Ahmad Ali; Sunardi, Sunardi
Jurnal Inovasi Teknologi Terapan Vol. 4 No. 1 (2026): Jurnal Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/jitt.v4i1.411

Abstract

Heat exposure can influence the changes in hardness and flexural strength of composites made from eggshell particles and bamboo fibers. The composite samples were prepared through cold compaction at 5 MPa for 2 hours. The materials were combined based on the following volume fractions: 50% epoxy resin, 10% alumina, 10% graphite, 5% zinc oxide (ZnO), and a 25% mixture of eggshell particles and bamboo fibers. The composite samples were then heated to 200°C for 1 hour. The final step involved curing, which required heating the samples in an electric oven at 150°C for 1 hour. Using a weighting method, the composite containing 25% eggshell particles achieved the optimal result, with a multi response performance index (MRPI) of 42.43. This composite exhibited hardness, modulus of elasticity (MOE), modulus of rupture (MOR), and strain values of 70.24 Shore D, 37.65 MPa, 8.58 MPa, and 0.78%, respectively. Conversely, the sample with 25% bamboo fiber and no eggshell particles demonstrated the highest flexural strength at 12.06 MPa, while the sample containing 25% eggshell particles recorded the highest hardness of 70.24 Shore D.
Co-Authors Abdul Aziz Agung Sudrajad Alief Maulana, Alief Haryadi - Indah Uswatun Hasanah Pranata, Anugrah Surya Arya Saefuloh, Iman Sunardi Sunardi Suryana Suryana Tri Partuti Ula, Shofiatul Wahyudi, Riyanto