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All Journal Jurnal Infrastruktur Sprocket : Journal of Mechanical Engineering Jurnal Darma Agung Jurnal Visi Eksakta ATDS Saintech Journal of Engineering PROFICIO: Jurnal Pengabdian Masyarakat
Lumbangaol, Partahi
Universitas HKBP Nommensen
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Simulasi CFD Distribusi Temperatur pada Pengering Biji Kopi dengan Sistem Konveksi Paksa Pasaribu, Humisar; Lumbangaol, Partahi; Napitupulu, Richard A.M; Siagian, Parulian; Siagian, Horas S; Setyawan, Eko Yohanes
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 5 No 1 (2023): Edisi Agustus 2023
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v5i1.1214

Abstract

Drying is a mass transfer and heat transfer process that is strongly influenced by temperature and air velocity. The importance of analyzing the temperature distribution and air velocity is expected to be used as a reference to optimize the drying process to be faster and better. This study aims to analyze the temperature distribution and air velocity that occurs in a coffee bean dryer with a forced convection system using CFD simulation. CFD simulations are carried out using ANSYS Fluent software. with steady conditions, and using a pressure-based solver method. The obtained temperature distribution occurs with an estimated absorber temperature difference with the drying chamber is 31% during the day.
Analisa Pengaruh Pendingin Terhadap Struktur Mikro Dan Sifat Mekanik Pada Baja ST 60 Siagian, Parulian; Nababan, Wilson Sabastian; Manurung, Charles S.P; Lumbangaol, Partahi; Siagian, Lestina; Manurung, Wany Chytra
SPROCKET JOURNAL OF MECHANICAL ENGINEERING Vol 5 No 2 (2024): Edisi Februari 2024
Publisher : Program Studi Teknik Mesin, Universitas HKBP Nommensen, Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36655/sprocket.v5i2.1406

Abstract

The field of industry that produces human needs is growing rapidly. Encouraging increased productivity with iron metal-based machine components. Using quality materials, and certified. This research uses ST 60 steel with a carbon content of 0.48%.. The research process that will be carried out is Heat treatment is needed to minimize failure, change the structure, and form the desired properties, the rapid cooling process to produce a comparison of hardness in material variations, hardness testing to determine the hardness of a material, and observation of microstructure to observe the type of microstructure formed after heat treatment and without heat treatment. After testing, the heat treatment process greatly affects changes in the mechanical properties of the material, as evidenced by the increase in hardness values which initially before the heat treatment process amounted to 194.6 Kgrf / to 255.53 Kgrf / with SAE 40 lubricant cooling media, 220.43 Kgrf / with 50% lubricant cooling media with 50% water mixture, and 300, 7 Kgrf/ with long life coolant media and it is proven that in each material given heat treatment the hardness value has increased as well, before heat treatment the hardness value in ST 60 steel is only 194.6 Kgrf/, experiencing an increase in mechanical properties, namely work with SAE 40 lubricant cooling media with a value of 255.53 Kgrf/, 50% lubricant cooling media with 50% water mixture worth 220.43 Kgrf/ and long life coolant of 300.7 Kgrf/.
RETROFITTING REINFORCED CONCRETE BEAMS USING CARBON FIBER REINFORCED POLYMER SHEETS AFTER EXPERIENCING FLEXURAL CRACKING DAMAGE Purba, Luki Hariando; Lumbangaol, Partahi; Saragi, Yetty Riris
Jurnal Infrastruktur Vol. 12 No. 1 (2026): Jurnal Infrastruktur
Publisher : Jurnal Infrastruktur

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35814/v28c4w87

Abstract

This study investigates the retrofitting of reinforced concrete beams that have experienced flexural damage due to overloading using Carbon Fiber Reinforced Polymer (CFRP) sheets. The tested beam had previously developed flexural cracks and tensile steel yielding but had not reached complete collapse, indicating the presence of residual structural capacity and ductility. Prior to strengthening, the existing cracks were repaired using Sikadur-31 CF epoxy to restore continuity in the damaged region. Subsequently, CFRP sheets were externally bonded along the tension face to enhance flexural performance. Experimental testing was conducted using a two-point loading system to evaluate load–deflection behavior, crack propagation, stiffness, and failure mode before and after repair and strengthening. The results showed that the retrofitted beam achieved a significant improvement in structural performance. The maximum load capacity increased by approximately 20.47%, accompanied by enhanced stiffness, while the ultimate deflection remained nearly unchanged. This indicates that the beam became stronger without a significant loss of deformation capacity within the tested range. Crack patterns after strengthening remained dominated by the tension zone, confirming a flexural behavior. Failure was initiated at the CFRP segment joints rather than in the compression zone, highlighting the importance of bond and joint detailing in CFRP applications. Overall, the study demonstrates that beams with prior flexural damage and steel yielding can be effectively rehabilitated and strengthened using CFRP, provided that sufficient residual ductility remains and proper design considerations are applied to avoid brittle failure.
Co-Authors Astri Agnes Bartholomeus Charles Manurung Johan Oberlyn Simanjuntak Lestina Siagian Manurung, Charles S.P Manurung, Wany Chytra Miduk Tampubolon Nababan, Wilson Nababan, Wilson Sabastian Napitupulu, Richard A M Pakpahan, Candra J.A Parulian Siagian Pasaribu, Humisar Purba, Luki Hariando Richard A M Napitupulu Roy Ganda Gultom Saragi, Yetti Saragi, Yetty Saragi, Yetty Riris Setyawan, Eko Yohanes Siagian, Horas S Siagian, Lestina Sidabutar, Ros Anita Sihombing, Suriady Simangunsong, Frisco Simanjuntak, J P Simanjuntak, Johan Oberlyn Simanjuntak, Salomo Simanungkalit, Okto Simorangkir, Adelina Basa Gloria Sinaga, Andre Damara Sintong Petrus Panjaitan Tiurma Elita Saragih Tumanggor, Brenico