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All Journal Rekayasa Mesin JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY Agrotekma: Jurnal Agroteknologi dan Ilmu Pertanian Jurnal Rekayasa Material, Manufaktur & Energi Dinamis Suara Teknik : Jurnal Ilmiah
Rakhmad Arief Siregar
Universitas Medan Area
Aerospace Engineering Agriculture, Biological Sciences & Forestry Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Transportation

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Simulasi Numerik tentang pengaruh geometri mandibula yang direkonstruksi terhadap tegangan von Mises Rakhmad Arief Siregar; Muhammad Yusuf Rahmansyah Siahaan; Riki Juliansyah
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol 5, No 2 (2021): EDISI DESEMBER
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v5i2.5349

Abstract

The study of mandibular reconstruction is known to be the most challenging procedure because a deformed chin may result in a person having low self-esteem. Despite advances in medical technology, there are always new trends related to mandibular implants. This study investigates the effect of reconstructed mandibular geometry on von Mises stress. There are three reconstructed mandibular models based on dental arches, square, ovoid and tapered to observe the distribution of von Mises stress. The three models were subjected to three varying loads around the alveolar ridge to simulate biting activity. The results show that geometric factors affect the distribution of von Mises stress, where the mandible with a tapered dental arch shows lower von Mises stress response compared to other mandibular models and has a significant effect when the applied load increases
Analisis Kekuatan Mekanik Material Komposit yang Berpeluang Diaplikasikan pada Handle Rem Sepeda Motor Felyx Berkat Sihombing; Muhammad Yusuf Rahmansyah Siahaan; Rakhmad Arief Siregar
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol 6, No 1 (2022): EDISI JUNI
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v6i1.6209

Abstract

Dalam penelitian ini dipaparkan tentang karakteristik kekuatan tarik komposit serat serabut kelapa dengan variasi resin, katalis untuk mengamati perubahan kekuatan tarik titik luluh, modulus elastisitas dan regangan patah. Dengan memanfaatkan bahan sisa dari sebuah kelapa, spesimen dicetak sesuai dengan standar. Hasil pengujian tarik menunjukkan nilai tegangan tarik rata-rata tertinggi terdapat pada spesimen 5 % katalis 95 % resin dengan nilai 27,24 MPa, untuk kekuatan luluh rata-rata teringgi terdapat pada spesimen 5 % katalis 95 resin dengan nilai 9,73 MPa, untuk modulus elastisitas rata-rata tertinggi terdapat pada spesimen 5 % katalis 95 % resin dengan nilai 7,77 MPa, dan yang terakhir untuk regangan patah rata-rata tertinggi terdapat pada spesimen 15 % katalis 85 % resin dengan nilai  11,50 MPa.
Analisis Ketahanan Impak Bahan Lembaran Polimer yang Berpotensi Digunakan untuk Penutup Spidometer Motor Roni Kosasih; Muhammad Yusuf Rahmansyah Siahaan; Rakhmad Arief Siregar
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol 6, No 1 (2022): EDISI JUNI
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v6i1.6210

Abstract

Penggunaan komposit saat ini sudah sangat luas mulai dari pembuatan pesawat, bidang otomotif, peralatan luar angkasa dan alat alat olah raga sudah menggunakan komposit. Pada penelitian ini, peneliti menggunakan polimer sebagai bahan pembuatan spedoometer motor karena polimer tahan terhadap panas, korosi  dan ringan. Penelitian ini menggunakan metode experimental karena hasil dari penelitian ini didapat melalui percobaan untuk melihat akibat dari suatu perlakuan yang dilakukan oleh peneliti. Pengujian komposit berbahan Resin dan lem PVA (polyvinyl acetate) dilakukan dengan alat uji anak panah jatuh bebas yang mengacu kepada ASTM D 1709 ISO 7765-1 dengan menggunakan metode pengujian anak panah dengan diameter kepala 38,1 mm dan dijatuhkan dari ketinggian 0,66 m dengan ketebalan spesimen 0,8 mm. Dari hasil pengujian komposit berbahan Resin dan lem PVA (polyvinyl acetate) diketahui pada variable pertama memiliki ketahanan impak sebesar 37,5 gr, pada variable kedua 45 gr dan variable ketiga 52,5 gr. Berdasarkan analisa ketahanan impaknya yang berpeluang diaplikasikan pada pembuatan speedometer motor yaitu variabel dua, melalui hasil dari keputusan pada tabel kriteria karakteristik teknik.
Perancangan Alat Uji Tarik Universal Statis dengan Penggerak Servomotor Berkapasitas Maksimum 1 kN Parulian Malau; Rakhmad Arief Siregar; M. Yusuf Rahmansyah Siahaan
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 6 No. 2 (2022): Edisi Desember 2022
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v6i2.6157

Abstract

In this paper, the author discusses the process of designing static universal tensile test equipment suitable for the laboratory scale of the material. The design presents data on customer expectations and embodiment analysis of the design of the tensile testing machine. This study aims to design a tensile testing machine, choose a match in making a tensile testing machine design following customer expectations, and analyze the embodiment of the design of the tensile testing machine. This research uses quantitative methods using surveys or questionnaires distributed to the research sub-project. The results of this tensile testing machine questionnaire survey are processed into research data which translates into engineering needs and its development into the tool design concept. The result of this study is the design and specifications of the tensile testing machine with a servomotor drive. The tensile testing machine has been successfully designed and works well and has met customers' needs.
Pembuatan Alat Uji Tarik Universal Statis Dengan Penggerak Servomotor Berkapasitas Maksimum 1 kN Feberius Gea; Rakhmad Arief Siregar; M. Yusuf Rahmansyah Siahaan
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 6 No. 2 (2022): Edisi Desember 2022
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v6i2.6173

Abstract

Tensile test is one of several tests that are commonly used to determine the mechanical properties of a material. The purpose of this research is to build and assemble products according to customer needs and to be able to analyze the process of making a static universal tensile tester with a servomotor drive with a capacity of 1 kN. It is hoped that this research can facilitate the selection of raw materials in providing information about the materials to be used and used. This tensile test equipment with a capacity of 1 kN uses a servomotor as the main driver. This type has begun to be used in the world because it is simpler than other motors, so this tool can compete with tensile test equipment sold in the market. This tool is equipped with supporting components such as a load cell, encoder and control panel using a data cable so that it gets graphic results when testing using visual studio software.
Perancangan Alat Uji Impak Anak Panah Jatuh Bebas untuk Menguji Lembaran Plastik dengan Kapasitas 120 gr Goodman Pakpahan; Muhammad Yusuf Rahmansyah Siahaan; Rakhmad Arief Siregar
JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY Vol. 7 No. 1 (2023): Edisi Juni 2023
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jmemme.v7i1.6295

Abstract

Pengujian impak merupakan suatu pengujian untuk mengukur ketahanan bahan terhadap beban kejut (dinamis). Pengujian impak mensimulasikan kondisi operasi material yang sering ditemui dimana beban tidak selamanya terjadi secara perlahan-lahan melainkan datang secara tiba-tiba. Alat uji impak yang akan dirancang dalam penelitian ini merupakan alat uji impak jatuh bebas. Alat uji impak ini memanfaatkan massa benda serta gaya gravitasi. Pengujian ini bertujuan untuk menganalisa pengaruh pembebanan impak jatuh bebas pada plastik yang dijatuhkan dari ke tinggian 0.66 m. Langkah yang dilakukan dalam penelitian ini meliputi pengujian dan pengambilan data untuk mengetahui energi yang diserap, harga impak, momentum, implus dan ketangguhan pada material baja struktur saat diberi beban kejut. Pada pengujian impak jatuh bebas ini, mempunyai jarak dan berat beban yaitu pada beban (m) = 30, 45, 60 gr dengan jarak ketinggian (h) = 0.66 m.
Analisis Sifat Mekanik Campuran Bubur Kertas Dengan Serat Tanaman Suku Palmae (Arecaceae) Nazaruddin Yusman; Rakhmad Arief Siregar; Muhammad Yusuf R Siahaan
Agrotekma: Jurnal Agroteknologi dan Ilmu Pertanian Vol. 6 No. 1 (2021): Agrotekma: Jurnal Agroteknologi dan Ilmu Pertanian, Desember
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/agr.v6i1.6171

Abstract

To utilize the waste of palm and areca fronds, fiber is used as one of the materials for making composites with a mixture of pulp as the main ingredient. By testing and analyzing the mechanical strength of the material, in order to know the strength of its mechanical properties which can later be potentially applied to cardboard box making materials. Tensile testing was carried out on a composite material mixed with pulp with oil palm and areca nut plant fibers. To carry out the tensile test, a tensile test specimen was made using seven test specimen variables with a composite material of a mixture of pulp with palm midrib and areca nut fibers, with a composition of 30:70, 50:50, and 70:30 in each mixture of each With the addition of one variable specimen of pulp mixed with mixed fiber, namely palm midrib fiber and areca nut with a composition of 30:70. Making specimens using the guidelines on the ASTM 3039M standard. Tensile testing was carried out using a tensile test machine at the Pancasarjana faculty of the University of North Sumatra. The test results were analyzed using the offset method. From the results of the analysis, the highest tensile stress value was found in the specimen, a mixture of pulp and fiber mix composition of 30:70 with a value of 3,058 MPa. The highest fracture strain was found in the mixed pulp specimen with areca nut fiber composition 30:70, with a tensile strain value of 0.0267. The highest yield strength was also found in specimens of mixed pulp with betel nut fiber composition 30:70 with a value of 0.015 MPa. The highest modulus of elasticity was found in the mixed specimen of oil palm midrib fiber at a composition of 30:70 with a value of 1.9107 MPa.
Analisis Karakteristik Mekanik pada Komposit Kertas Kardus yang Diperkuat dengan Serat Batang Pisang Yusrizha Syahid; Rakhmad Arief Siregar; M. Yusuf Rahmansyah Siahaan
Agrotekma: Jurnal Agroteknologi dan Ilmu Pertanian Vol. 6 No. 1 (2021): Agrotekma: Jurnal Agroteknologi dan Ilmu Pertanian, Desember
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/agr.v6i1.6172

Abstract

The development of composite technology in the industrial world has progressed very rapidly until now. The most important element of composite materials is fiber, which gives the material characteristics such as strength, ductility and other mechanical properties. So far, cardboard and banana trees are only known as waste which is very easy to find in the housing environment. Therefore, research on composites was carried out by utilizing used cardboard and banana trees. The used cardboard then crushed and then mashed into a pulp them combined/mixed using kepok banana tree fiber and mas banana tress fiber which aims to determine the mechanical characteristics of the cardboard paper composite reinforced with materials. As the main adhesive while using PVac glue. The specimen mixture has variations of 30:70, 50:50 and 70:30 with each having 3 variabel in each composition, and the mixture of pulp with mixed kepok and mas fibers has a variation of 50:50 with 3 variabels, all using ASTM standart guidelines, 3039 M. The results of the tensile test of the highest fracture strain value was a mixture of pulp with banana kepok fiber at a composition of 30:70 of 0,0457 MPa, the highest value of yield strength was a mixture of pulp with mixed fiber composition of 50:50 of 1,125 MPa, The highest value of modulus of elasticity is the mixture of pulp and fiber mix 50:50 composition of 1,281 MPa.
Analisis Kekuatan Mekanik Material Komposit Berserat Sabut Kelapa yang Berpeluang Diaplikasikan pada Pembuatan Spakbor Sepeda Motor Darwis Saragih; Muhammad Yusuf Rahmansyah Siahaan; Rakhmad Arief Siregar
Agrotekma: Jurnal Agroteknologi dan Ilmu Pertanian Vol. 6 No. 1 (2021): Agrotekma: Jurnal Agroteknologi dan Ilmu Pertanian, Desember
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/agr.v6i1.6212

Abstract

Utilization of coconut fiber has attracted researchers to determine the mechanical properties of coconut fiber including the value of tensile strength, strain and modulus of elasticity. This study used variables 0 fiber, 5 fiber and 11 coconut fiber then the ratio between the matrix and the catalyst was 10:1 ml. In this study, the material used in the manufacture of composite materials is a type of polyester resin with a catalyst and the reinforcing material is coconut fiber. The composite will be made using the ASTM D 3039M-14 standard with a specimen size of 175 mm x 25 mm x 2 mm. The mold is made of glass and shaped to size using green double-sided foam tape. This tensile testing site was carried out at the Impact and Fracture Research Center, University of North Sumatra. Based on the analysis that has been carried out on the results of the tensile test, it includes looking for the value of tensile stress, yield strength, modulus of elasticity and point of fracture strain. With this test, the highest average tensile stress value is found in variable 5 coconut fiber with a value of 44,076 MPa. While the average value of yield strength is found in the 5 fiber variable with a value of 26,460 MPa, the largest average elastic modulus value is found in the 0 fiber variable of 1360 MPa. In this study, the comparison of the strength of the coconut fiber composite was uneven, this was due to the imperfect shape and process of making the specimen so that the fracture that occurred during the tensile test did not fully occur in the middle of the specimen object.
EFFECT OF DIAMETER BEARING MOUNTS TO STRESS CONCENTRATION FACTOR ON TRUCK GEARBOX CASING Siregar, Rakhmad Arief; Siahaan, Muhammad Yusuf Rahmansyah; Rizal, Mahmud
Jurnal Rekayasa Mesin Vol. 15 No. 2 (2024)
Publisher : Jurusan Teknik Mesin, Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/jrm.v15i2.1702

Abstract

The present study examines the effect of diameter bearing mounts to the stress concentration factor. Three commercial truck gearbox casings were selected for redrawing using CATIA. The gearbox casing is then converted into a FEM model in ANSYS. It has a bore ratio (the ratio of the largest diameter to the smallest diameter of the bearing diameter) of 1.8, 1.5 and 1.4. By applying pressure to the upper gearbox casing for static and dynamic conditions, the total deformation response and equivalent stress are investigated. The deformations and equivalent stresses on the three models of gearbox were determined and discussed. It was found that the bore ratio of the gearbox showed significant differences in results on deformations and equivalent stress. Based on the equivalent stress data of view A, which is the side of the gearbox casing connected to the engine, the stress concentration factor results are consistent with the bore ratio.
Co-Authors Amru Siregar Amru Siregar Darwis Saragih Faisal Amri Tanjung Faisal Amri Tanjung Feberius Gea Felyx Berkat Sihombing Goodman Pakpahan M. Yusuf Rahmansyah Siahaan M. Yusuf Rahmansyah Siahaan Muhammad Nuh Hudawi Pasaribu Muhammad Yusuf R Siahaan Muhammad Yusuf Rahmansyah Siahaan Muhammad Yusuf Rahmansyah Siahaan Nasution, Ahmad Yunus Nasution, Ahmad Yunus Nazaruddin Yusman Parulian Malau Riki Juliansyah Rizal, Mahmud Roni Kosasih Saktiawan, Agung Siahaan, M. Yusuf R. Siahaan, M. Yusuf Rahmansyah Siregar, Doni Alfiah Yusrizha Syahid zulfikar, Achmad Jusuf