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All Journal Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY Jurnal Rekayasa Material, Manufaktur & Energi Martabe : Jurnal Pengabdian Kepada Masyarakat AMALIAH: JURNAL PENGABDIAN KEPADA MASYARAKAT Jurnal Abdi Insani IRA Jurnal Teknik Mesin dan Aplikasinya (IRAJTMA) IRA Jurnal Pengabdian Kepada Masyarakat Jurnal Ilmiah Teknik Mesin & Industri (JITMI)
Bobby Umroh
Universitas Medan Area
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Automotive Engineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Social Sciences Other

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Karakteristik permukaan dan struktur mikro Pada bahan aluiminium 6061menggunakan Pahat Karbida dengan metode pemesinan laju tinggi dan pemesinan kering umroh, bobby
JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY Vol 1, No 2 (2017): Edisi Desember
Publisher : JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY

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Abstract

Penelitian pemesinan laju tinggi  dan kering dengan tujuan untuk kemasan permukaan yang meliputi corak permukaan cacat (defect) yang diakibatkan oleh kondisi pemesinan  pada  bahan aluminium 6061 menggunakan pahat karbida. Pengumpulan data pengujian pemesinan ini dilakukan menggunakan metode faktorial data sebanyak 8 kali percobaan dengan 3 variabel utama yaitu laju pemotongan(V), laju pemakanan (f) dan kedalaman potong (a) pada tiga tiga tingkat besaran. Dari percobaan yang telah direkomendasikan dengan kondisi pemesinan terbaik  maka didapati beberapa Nilai kekasaran permukaan sangat ditentukan oleh aus pahat yang tinggi. Aus pahat yang tinggi (0.129-0.247)sangat berpotensi terjadi cacat berupa koyak permukaan (tearing surface) permukaan benda kerja termesin, pada laju pemakanan yang tinggi terjadi feed mark goresan karena laju pemakanan yang tinggi .Lebar butiran pada mikrostruktur sangat ditentukan oleh kecepatan potong, dimana pada kecepatan potong V= 1000 m/min besarnya butiran terlihat lebih melebar sedangkan pada V=1250 m/min besar butiran terlihat lebih rapat
NUMERICAL ANALYSIS OF STRENGTH OF REAR BRAKE HOLDER FLAT ON THE MOTOR CYCLE DUE TO IMPACT LOAD Zulfikar, Zulfikar; Umroh, Bobby; Amrinsyah, Amrinsyah; Kurniawan, Fadly A
JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY Vol 2, No 1 (2018): EDISI JUNI
Publisher : JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY

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Abstract

Brake is one of vital motorcycle element, which serves as a speed reduction mechanism. This section reinforced with retaining plate which serves to hold the wheels when braking process occurs. Research on the plate strength is still rarely found. Stress distribution that occurs on the plate due to shock loads is also not well known. Therefore, this study aims to obtain the strength retaining plate with a numerical analysis of the distribution of stress and deformation which occur on plate. Research done in two ways, experimentally and numerical simulations. Experimentally, direct measurements on the amount of stress that occurs on the plate. The research was done by putting strain gage on the connection plate and brake. In simulation, using Nastran software with the primary data based on the results of the experimental measurements. Based on the results of the numerical analysis of the stress distribution that occurs is obtained that the maximum stress distributed around the staging area in direct contact with the brake. Therefore, motorists should be aware that section and provide additional anchoring structure to further strengthen the structure of the retaining plate rear brake.
Numerical Simulation on Mechanical Strength of a Wooden Golf Stick Darianto, Darianto; Umroh, Bobby; Amrinsyah, Amrinsyah; zulfikar, zulfikar
JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY Vol 2, No 1 (2018): EDISI JUNI
Publisher : JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY

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Abstract

In general, golf players only know the techniques used in Golf games, but do not know the golf sticks response that occurs when the ball is hit. Referred to as response is the stress and strain that arises from the impact load that occurs when the hitting member touches the ball. The objectives of this research are: (a) to analyze golf sticks response when impact occurs, and (2) to know the stress distribution that occurs in golf sticks. The golf stick design in this study uses the autodesk inventor software. The material used is Titanium for head stick and Graphite for stick rod. The basic principle of this study is based on simple swing pendulum method. The variables that will be used for simulation are: swing speed, that is difference between start and end speed, that is Δv = 272,2 m / s, impact time, which is the time when the ball touches the batter Δt = 0.0005 seconds, the volume of the head of the stick Vo = 96,727 mm3, the cross-sectional area of the stick A = 63,504 mm2, the head mass of the sticks ρ = 4620 kg / m3, and the modulus of titanium elasticity 9.6 e +10 Pa. From the simulation result on the surface of the golf club hitter is obtained as follows: σmax = 2.1231e +10 Pa at 1.231e-06 s, emax = 0.22115 m / m at 1.231e-06 s, and the maximum stress and strain is located in the area the connection between the stick and the head of the stick.
Study on the CBN Tool Wear Mechanism on Dry High-Rate Turning Process for AISI 4140 Harto, Budi; Umroh, Bobby; Darianto, Darianto
JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY Vol 2, No 1 (2018): EDISI JUNI
Publisher : JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY

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Abstract

This study aims to investigate tools wear and wear mechanisms when machining high-rate extreme minimum lathe AISI 4140 material in hard and dry cutting conditions. Cutting tool made from CBN CB7015 Sandvik Coromant production is used for turning of AISI 4140 steel in order to obtain the failure mode of tool and the wear mechanism of the cutting tool. The machining process is carried out under dry cutting conditions with variations of high velocity Vc, feeding rate f, and a cutting depth a at minimum rate conditions. The wear growth curve obtained shows that the CBN tool undergoes three phases: the initial phase, the gradual phase, and the abrupt phase. From the results of the study found that the failure modes that occur are flank wear, crater wear, flaking, chipping, and fracturing catastrophic failure. The wear mechanism that occurs in outline is caused by abrasive, adhesive, and diffusion processes. While the cracks and fractures that occur due to a combination of impact load and thermal shock
Manufacture of Water Pipe From Clampshell Powder Materials Rahmansyah, Abdul; zulfikar, zulfikar; umroh, bobby
JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY Vol 2, No 2 (2018): Edisi Desember
Publisher : JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY

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Abstract

In general, household waste water pipelines use plastic pipes of PVC type that are not environmentally friendly and are relatively expensive. Therefore, this research will design molds and manufacture of composite pipes using raw materials of clampshell powder. The raw material used is clampshell powder with the composition of MgO and CaO compounds which is about 22.28% and 66.70%. The mixture of materials used consisted of clampshell powder with a size of 40 mesh, catalyst, and unsaturated polyester resin as a matrix. The objective of this study is manufacture of water pipes made from polymer composites reinforced by clampshell powder. Composite pipe manufacturing is carried out using the casting method. Pipe molds are made of stainless steel with a diameter of 40.46 mm (1.6 in) and an outer diameter of 50.8 mm (2 in). This mold size follows SNI 06-0084-2002 standards. The results of the study, water pipes from polymer composite material reinforced by clampshell powder with an inner diameter size of 40.64 mm and varying outside diameter. This variation depends on the composition of the clampshell powder in composite materials. The greater the clampshell powder composition, the more easily the maximum pipe wall thickness can be obtained. The average wall thickness variation is 3.35 mm. This variation is still included in the polymer water pipe requirements, which is a minimum of 2 mm.
SIMULASI KEKUATAN MEKANIS MATERIAL KOMPOSIT TEMPURUNG KELAPA MENGGUNAKAN METODE ELEMEN HINGGA Darianto, Darianto; Siregar, Amru; Umroh, Bobby; Kurniadi, Dedi
JMEMME (JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY) Vol 3, No 1 (2019): EDISI JUNI
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (201.513 KB) | DOI: 10.31289/jmemme.v3i1.2443

Abstract

Komposit merupakan sejumlah sistem multi fasa sifat gabungan, yaitu gabungan antara bahan matriks atau pengikat dengan penguat. Penelitian ini dilakukan menggunakan metode kuantitatif dengan rancangan penelitian eksperimental serta membandingkan hasil pengujian pada metode elemen hingga yang dilakukan penelitian di laboratorium. Objek penelitian berupa serat tempurung kelapa yang dipilih karena melimpahnya sumber daya alam tersebut. Spesimen matriks resin dibuat dengan standar ASTM D 638 M-84 dengan bahan resin epoksi dan katalis menggunakan metode pengecoran. Teknik pengumpulan data yang digunakan adalah teknik pengujian laboratorium. Instrumen yang digunakan berupa lembar pencatatan. Dari hasil penelitian yang dilakukan didapatkan kekuatan tarik komposit tertinggi dengan tata letak random sebesar 3,38 kgf/mm2 dan perpanjangan sebesar 0,38 mm, Cross sebesar 3,03 kgf/mm2 dan perpanjangan sebesar 0,86 mm, continuous sebesar 2,24 kgf/mm2 dan perpanjangan sebesar 1,03 mm, woven sebesar 1,64 kgf/mm2 dan perpanjangan sebesar 0,64 mm. Bentuk patahan menunjukan bahwa hasil pengujian tarik mengalami patahan getas, karena ujung patahan terdapat patahan 900 dan kasar di karenakan adanya mekanisme fiber pull out.
INVESTIGATION OF MECHANICAL BEHAVIOR OF POLYMERIC FOAM MATERIALS REINFORCED BY OIL PALM EMPTY FRUIT BUNCHES (OPEFB) FIBERS DUE TO STATIC AND DYNAMIC LOADS Zulfikar, Achmad Jusuf; Umroh, Bobby; Siahaan, Muhammad Yusuf Rahmansyah
JMEMME (JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY) Vol 3, No 1 (2019): EDISI JUNI
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (534.099 KB) | DOI: 10.31289/jmemme.v3i1.2416

Abstract

Polymeric composite foam with EFB fiber reinforced is new material that can be utilized as an alternative engineering material. EFB fiber utilization becomes the center of subject in this research. Moreover, these composites are unique with the presence of cavities (foam) in the matrix of unsaturated polyester resin. It results a decrease in density of the material that formed, and obtain a thermoset polymer composite material lighter than any else similar type. The objective of this study is to obtain the best manufacturing techniques of composite material, the mechanical behavior of these materials due to tensile static loading and high strain rate impact, and the distribution of foam that occur in the material that formed as a result of blowing agent (BA) from the type of polyurethane (PU). In this research, the sample formed into standard specimen of testing, such as ASTM D638 for static tensile test, and impact test specimen. Mechanical’s behaviors that are obtained in this research are density, tensile strength, modulus of elasticity (E), the incident stress, and dynamic modulus of elasticity of the material. For static testing was performed according to standard ASTM D638 tensile and impact test using the Kolsky’s method. To know the distribution of foam that occur in the material, were observed using Scanning Electron Microscope instrument (SEM). To determine the stress distribution in this material, then conducted a computer simulation using Ansys. The best result obtained by the composition of this material based on material composition, which resin consumption can be reduced by the presence of BA as well as mechanical strength, good enough for molding. The best composition in this study will be used in subsequent studies, namely the design and manufacture of traffic cones from this material.
ANALISIS KEKUATAN STRUKTUR RANGKA MESIN PENGERING BAWANG MENGGUNAKAN PERANGKAT LUNAK ANSYS APDL 15.0 Sofyan, Azwir; Glusevic, Jean; Zulfikar, Achmad Jusuf; Umroh, Bobby
JMEMME (JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY) Vol 3, No 1 (2019): EDISI JUNI
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (323.33 KB) | DOI: 10.31289/jmemme.v3i1.2417

Abstract

Typical technology for processing red onion affects the quality of red onion produced. The process of drying red onion is one of the important factors in producing the best quality of red onion. Environmentally friendly and easy operation and maintenance technology is the desired technology. In the process of engine design, the strength of the material and structure are the main factors of the building of the machine. Calculation with finite element method (FEM) is the best choice to obtain information on stress distribution on a machine structure. In this study, the calculation of the FEM method was assisted by Ansys APDL 15.0 software. The objectives of this study were: (1) calculation of the load on the tray structure, (2) the distribution of stress on the tray structure, seat, and frame for red onion dryers, and (3) analyzing the strength of the material using the Tresca and Energy Distortion methods. The input load comes from the weight of the tray and red onion. The analytical method used is the finite element method with the type of structural analysis and Beam 3Node 189 element type. Based on the FEM simulation results, the maximum stress that occurs in the tray is 1.22 MPa and the maximum deflection is 0.0055 mm. The maximum stress in the tray support structure is 33.25 MPa and the maximum deflection is 0.014 mm. The maximum stress on the frame structure of the onion drying machine is 0.89 MPa and the maximum deflection is 0.000235 mm which occurs in the middle of the machine structure. Using the Tresca and Distortion Energy theories, it is found that the stresses that occur are still far from the failure criteria for all structures. Likewise, the deflection that occurs is very small so that the construction of the onion drying machine is safe to use.
ANALISA KINERJA MATA PISAU MESIN PENGIRIS KULIT KELAPA MUDA Umroh, Bobby; Darianto, Darianto; Sipangkar, Rinto Supardi
JMEMME (JOURNAL OF MECHANICAL ENGINEERING, MANUFACTURES, MATERIALS AND ENERGY) Vol 3, No 1 (2019): EDISI JUNI
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1023.438 KB) | DOI: 10.31289/jmemme.v3i1.2429

Abstract

Kelapa muda umumnya disajikan secara alami dengan bentuk kerucut di atas. Proses pembentukan kelapa ini sudah dilakukan secara manual di industri rumah tangga dengan menggunakan sebilah parang. Proses ini memiliki resiko kecelakaan kerja yang tinggi. Kelapa yang dihasilkan pada proses ini memiliki bentuk yang kurang menarik, tidak seragam, dan sulit untuk dibuka. Oleh sebab itu, dibutuhkan alat pengiris kulit kelapa muda yang dapat menghasilkan bentuk yang lebih baik, seragam, dan aman untuk digunakan. Untuk merancang alat pengiris kulit kelapa muda, penting untuk melakukan analisis mekanisme pemotongan kulit kelapa muda. Tujuan dari penelitian ini adalah untuk menganalisis mekanisme pemotongan kulit kelapa muda, membangun model matematika pendugaan gaya spesifik pemotongan, dan mendapatkan daya pemotongan maksimum pemotongan kulit kelapa muda. Variasi faktor sudut ketajaman, sudut potong, dan sisi mata pisau dioptimalkan untuk menghasilkan gaya potong terendah. Model matematika telah dibangun untuk menduga gaya pemotongan maksimum untuk pisau satu sisi menajam dan dua sisi menajam dengan sudut potong (θ) 00, 150, dan 300. Dari hasil penelitian disimpulkan bahwa jenis pisau yang menghasilkan gaya pemotongan terendah adalah pisau dua sisi menajam dengan sudut ketajaman 100 dan sudut potong 300. Daya terendah untuk pemotongan tegak lurus kulit kelapa muda adalah 0,12 kW yang dihasilkan dengan menggunakan pisau dua sisi menajam dengan sudut ketajaman 100 dan sudut potong 300. Daya pemutaran maksimum yang dibutuhkan untuk memotong kulit kelapa muda adalah 0,75 kW.
ANALISA GAYA DAN SUDUT RAHANG PADA ALAT PEMBUKA BUAH DURIAN METODE GERAK PUTAR RELATIF Nainggolan, Danis; zulfikar, Achmad Jusuf; umroh, bobby
JMEMME (JOURNAL OF MECHANICAL ENGINEERING MANUFACTURES MATERIALS AND ENERGY) Vol 3, No 2 (2019): EDISI DESEMBER
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (208.582 KB) | DOI: 10.31289/jmemme.v3i2.2813

Abstract

Pada prinsipnya, teknologi dipergunakan manusia untuk memberikan kemudahan dan peningkatan terhadap efisiensi kerja, baik ditinjau dari sisi waktu maupun biaya produksi. Pada penelitian ini, sebuah alat pembuka buah durian dengan metode rahang berputar telah dibangun dan telah diuji. Analisa gaya untuk membuka buah durian dengan menggunakan alat ini menjadi fokus utama dalam penelitian ini. Tujuan penelitian ini ialah mengukur beban dan sudut pengupasan buah durian serta menghitung kapasitas dan efisiensi alat tersebut. Metode pengambilan data pengujian ialah dengan meletakkan alat pengukur beban pada alat pembuka buah durian dan mencatat nilai beban yang diberikan selama proses pengujian berlangsung. Buah durian diletakkan dalam rahang khusus yang dapat digerakkan berputar relatif terhadap pisau. Jenis buah durian yang dipergunakan dalam penelitian ini terdiri dari buah durian matang dan buah durian mentah. Hasil yang diperoleh ialah gaya rata-rata yang dibutuhkan untuk membuka buah durian matang ialah 99 N dengan sudut rahang rata-rata 45o dan waktu rata-rata 9,5 detik. Sedangkan untuk buah durian mentah, gaya rata-ratanya ialah 134 N dengan sudut rahang rata-rata hingga 80o dan waktu proses pembukaan rata-rata hingga 15 detik. Kapasitas alat untuk buah matang ialah 185 buah/jam dan buah mentah 144 buah/jam. Efisiensi alat untuk buah matang dan mentah adalah sama, yaitu mencapai hingga 85%.
Co-Authors Abdul Rahmansyah Achmad Jusuf Zulfikar Achmad Jusuf zulfikar Ahmad Marabdi Siregar Alfifto Amiruddin, Arfis Amrinsyah Amrinsyah Amrinsyah, Amrinsyah Amru Siregar Amru Siregar Azwir Sofyan Budi Harto Dadan Ramdan Danis Nainggolan Darianto Darianto Darianto Darianto Darianto, Darianto Dedi Kurniadi dedi kurniadi Dewi Setia Tarigan, Eka Elapri, Bima Yoel Ellen Lumisar Panggabean Fadly A Kurniawan Fauji S, Ahmad Glusevic, Jean Harahap, Uun Novalia Harto, Budi INDRA HERMAWAN Iswandi Iswandi Iswandi Iswandi Jean Glusevic Jufrizal Jufrizal Kamaluddin Kurniawan, Fadly A Maulana, M Rizky Muhammad Idris Muhammad Idris Muhammad Yusuf Rahmansyah Siahaan Nainggolan, Danis Prawoto, Yogi Purba, Jepriadi Rahmansyah, Abdul Rahmatullah . Rinto Supardi Sipangkar Salqaura, Siti Alhamra Sarjana, SS Siagian, Martua Sangap Siahaan, Muhammad Yusuf Rahmansyah Sianturi, Danial Jack Marbis Sipangkar, Rinto Supardi Siti Mardiana Sofyan, Azwir Tumangger, Theo Fredrik Yopan Rahmad Aldori Yuni Syahputri zulfikar zulfikar zulfikar, Achmad Jusuf Zulfikar, Achmad Jusuf Zulfikar, Achmad Jusuf zulfikar, zulfikar