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All Journal Mesin International Journal of Engineering, Science and Information Technology
Riza Wirawan, Riza
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Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Transportation

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Kajian Penentuan Modulus Elastisitas Baja dan Aluminium dengan Metoda Ultrasonic Pitch & Catch Priambodo, Toni Agung; Judawisastra, Hermawan; Wirawan, Riza
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.2025.30.2.4

Abstract

Modulus elastisitas adalah salah satu sifat material yang menyatakan nilai kekakuan dari material tersebut. Modulus elastisitas menunjukkan kemampuan material untuk menahan deformasi elastis saat diberi tegangan, yang mencerminkan hubungan antara tegangan dan regangan dalam batas elastisitas material tersebut. Metoda paling umum untuk menentukan nilai modulus elastisitas adalah dengan uji tarik tetapi masih mempunyai kekurangan harus merusak benda uji. Metoda uji tidak rusak yang dapat digunakan untuk menentukan nilai modulus elastisitas salah satunya adalah dengan menggunakan uji ultrasonik. Penentuan nilai modulus elastisitas dengan metoda ultrasonik pada material logam sudah dilakukan sebelumnya namun belum dapat menentukan nilai modulus elastisitas pada material pipa atau pada material dengan permukaan yang luas. Penelitian ini bertujuan mengkaji penentuan nilai modulus elastisitas pada material baja dan aluminium dengan metoda ultrasonik pitch & catch dengan variasi formula, variasi frekuensi probe dan variasi tebal benda uji. Validasi hasil uji dilakukan dengan membandingkan modulus elastisitas hasil metoda ultrasonik pitch & catch dengan modulus elastisitas dari referensi. Hasil penelitian menunjukkan bahwa variasi frekuensi probe, jarak antar probe dan tebal benda uji diatas 5mm menghasilkan nilai modulus elastisitas yang sesuai dengan referensi. Tebal benda uji dibawah 5mm menjadi batasan dari metoda ultrasonik pitch & catch dalam menentukan nilai modulus elastisitas karena data kecepatan gelombang longitudinal tidak akurat pada material yang tipis.
Study on Magnetic Properties Characterization of Aceh Iron Sand as Raw Biomedical Application Materials Sayuti, Muhammad; Yusuf, Muhammad; Putra, Reza; Wirawan, Riza
International Journal of Engineering, Science and Information Technology Vol 5, No 3 (2025)
Publisher : Malikussaleh University, Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52088/ijesty.v5i3.975

Abstract

The magnetic properties characterization of Aceh iron sand as the preferred material for biomedical applications was studied. Meanwhile, Aceh's iron sand is used as raw cement-making material. It is hoped that in the future, it can be used in many different biological and medical applications, such as diagnostic tests for early disease detection, to serve as tools for non-invasive imaging and drug development. Samples of the natural resource were prepared using a magnetic separator, and the concentrates were mashed by the ball milling method to achieve 112.7µm (MK), 119.3 µm (MT), 112,4 µm (LP), and 115.1 µm (SK) particle size. These features were evaluated from loop hysteresis using a vibration sample magnetometer (VSM), while x-ray diffraction (XRD) was employed to analyze iron oxide. The results estimated the values of saturation magnetization, remanent magnetization, and coercivity from Mon Klayu, Mantak Tari, Lam Panah, and Syiah Kuala at 67.79 emu/g, 10.36 emu/g and 0.02 T; 83.49 emu/g, 13.22 emu/g and 0.02 T; 62.17 emu/g, 9.32 emu/g and 0.02 T; 73.26 emu/g, 10.34 emu/g and 0.02 T, respectively. However, Fe3O4 (magnetite) occurred predominantly in the selected locations.
Co-Authors Hermawan Judawisastra, Hermawan Muhammad Yusuf Priambodo, Toni Agung Putra, Reza Sayuti, Muhammad