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All Journal Journal of Mechanical Engineering Science and Technology Jurnal Bakti Masyarakat Manajemen Bhinneka Multidisiplin Journal
Tumpal Ojahan Rajagukguk
mahasiswa pasca sarjana program studi mesin fakultas teknik unsri
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Optimization of Stir Casting of Aluminum Matrix Composites (AMCs) with Filler of Recycled Glass Powder (RGP) for The Mechanical Properties Hendronursito, Yusup; Rajagukguk, Tumpal Ojahan; Anshori, Anang; Yunanto, Asep
Journal of Mechanical Engineering Science and Technology (JMEST) Vol 4, No 2 (2020)
Publisher : Universitas Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17977/um016v4i22020p101

Abstract

A study of making Aluminum Matrix Composites (AMCs) uses recycled glass powder (RGP) as a filler has been carried out through the stir casting process. The experimental design uses the Taguchi method of 3^3 orthogonal array L9 with the parameters of powder size (20>x> 80, 80>y> 200, 200>z> 325), percentage of filler vs matrix (2%, 7%, 12%), and stirring time (30 Seconds, 3 Minutes, 12 Minutes). The optimum conditions for the hardness of Al-GRp composites were obtained from specimens with Mesh powder size parameters 200> z> 325, the percentage of glass vs aluminum powder was 12% wt, stirring time was 12 minutes. The experimental factor that has the greatest contribution to the hardness value of Al-GRP composites is the size of glass powder of 73.77%, followed by the percentage of glass powder to aluminum by 19.98%, and the stirring time of 1.21%. The optimum experimental parameters for tensile strength can be obtained from specimens with particle size parameters of 20> x> 80, the percentage of glass powder to the weight of aluminum 12%, and the stirring time of 30 seconds. The biggest contribution to the tensile strength value of the Al-GRP composite was the stirring time of 72.71%, followed by the percentage of glass powder to aluminum by 13.67%, and the size of the powder was 9.97%.
PELATIHAN DASAR TEKNIK PENGELASAN SHIELDED METAL ARC WELDING (SMAW) BAGI WARGA UNIVERSITAS MALAHAYATI UNTUK PENINGKATAN KEMAMPUAN SDM TERAMPIL Marjuni, Teuku; Rajagukguk, Tumpal Ojahan; Ibrahim, Fauzi; Ansyori, Anang; Prastyo, Adi; Hadi, Agung Efriyo
Jurnal Bakti Masyarakat Manajemen Vol 3, No 2 (2023): Volume 3 Nomor 2 Tahun 2023
Publisher : Program Studi Manajemen Fakultas Ekonomi dan Manajemen Universitas Malahayati

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33024/jbmm.v4i1.16259

Abstract

Teknik pengelasan SMAW merupakan jenis pengelasan sederhana yang sering dimanfaatkan oleh Sebagian warga untuk menyambungkan berbagai jenis logam. Hingga saat ini Teknik pengelasan SMAW digunakan untuk kegiatan sehari – hari maupun mata pencaharian utama bagi masyarakat luas. Peluang penerapan jenis pengelasan ini akan menunjang produktifitas warga secara efisien. Potensi maupun bakat yang dimiliki setiap orang berbeda ketika melakukan pengelasan. Pelatihan Teknik pengelasan SMAW bagi warga dan mahasiswa muda universitas malahayati ini akan digunakan sebagai tutor serta peningkatan SDM terampil.
STUDI KASUS MORFOLOGI NANOFIBER POLIVINIL ALKOHOL (PVA) TERHADAP HIDROFOBISITAS PERMUKAAN YANG DINILAI DENGAN PENGUKURAN SUDUT KONTAK Berly, Yoga Maharesha; Rajagukguk, Tumpal Ojahan; Hendronursito, Yusup
Bhinneka Multidisiplin Journal Vol. 2 No. 4 (2025): Bhinneka Multidisiplin Journal
Publisher : Yayasan Education and Social Center

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53067/bmj.v2i4.71

Abstract

Nanofiber is a fiber measuring nanometers to micrometers, often used in the medical, energy, filtration, and other fields. The formation of nanofiber with the main ingredient, namely Polyvinyl Alcohol (PVA), this is because of its biodegradable, biocompatible, and chemically stable properties, but has the weakness of being easily degraded when in contact with water. This study examines the effect of electrospinning parameters on the morphology of 10% w/v PVA nanofiber, with parameters namely voltage of 10 and 12 kV, nozzle-collector distance of 10 and 15 cm. Morphological testing was carried out using a Field Emission-Scanning Electron Microscope (FE-SEM) and Contact Angle (CA) test. The test results show that PVA nanofiber has a fiber diameter with a value of NFZ.1; 80 - 406 nm, NFZ.2; 61.7 - 248.9 nm, with a continuous fiber structure and without significant defects, the resulting contact angle value of NFZ.1; 50.05o and NFZ.2; 38.75o, the contact angle value of NFZ.1 is higher than NFZ.2. The nanofiber with the smallest diameter is NFZ.2 and the largest contact angle value is NFZ.1. The results of this research show that the morphology of nanofiber significantly influences the contact angle value.
Co-Authors Anang Ansyori Anshori, Anang Berly, Yoga Maharesha Hadi, Agung Efriyo Ibrahim, Fauzi Marjuni, Teuku Prastyo, Adi Yunanto, Asep Yusup Hendronursito, Yusup