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All Journal TEKNIK Jurnal Ilmu Dasar Jurnal Simetris Jurnal Pengembangan Pendidikan Jurnal Teknosains Jurnal Teknologi SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Rekayasa Mesin Sinergi REKAYASA ROTOR: JURNAL ILMIAH TEKNIK MESIN Jurnal Litbang Industri EMITTER International Journal of Engineering Technology Journal of Mechanical Engineering Science and Technology Panrita Abdi - Jurnal Pengabdian pada Masyarakat Journal of Energy, Mechanical, Material and Manufacturing Engineering STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Jurnal POLIMESIN Multitek Indonesia : Jurnal Ilmiah Jurnal Elemen Jurnal Riset Teknologi Industri J-Proteksion: Jurnal Kajian Ilmiah dan Teknologi Teknik Mesin JURMA : Jurnal Program Mahasiswa Kreatif Jurnal Abdi Masyarakat Indonesia Jurnal Litbang Industri
Mahros Darsin
Jurusan Teknik Mesin Fakultas Teknik Universitas Jember
Agriculture, Biological Sciences & Forestry Humanities Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Public Health Social Sciences Other

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Journal : ROTOR: JURNAL ILMIAH TEKNIK MESIN

 1 
ANALISIS SIFAT MEKANIK HASIL PENGELASAN ALUMINIUM AA 1100 DENGAN METODE FRICTION STIR WELDING (FSW) Sumarji, Sumarji; Sudrajat, Angger; Darsin, Mahros
ROTOR Vol 5, No 1 (2012)
Publisher : ROTOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (603.174 KB)

Abstract

Aluminum and aluminum alloys have properties that are less well when coMPared to steel, such as specific heat and has a high conductivity. They are also easily oxidized and form an aluminum oxide Al2O3 which have a high melting point. Consequently, when they are welded the fusion between base and weld metal will be blocked. Moreover, if the cooling process is too fast it will form a smooth cavity ex-pouch of hydrogen. Friction stir welding (FSW) is a challenging alternative for joining aluminum alloy. In FSW, process occur in the solid state (solid state joining). In this research, some attempts were carried out to find the best quality of welding, in term of mechanical properties and microstructure. Tool rotation speed was varied at 780, 980, 1120 rpm. Whereas, feed rate used was keep constantly at 15 mm/min. The material to be welded is a- 4.0 mm thick aluminum AA 1100 strips. Result showed that the highest strength obtained is 56.528 MPa at 1120 rpm and the lowest strength obtained is 38.472 MPa at 980 rpm. Wormholes and the lack of penetration defects are the main things that reduce the tensile strength. From micro observations known on the grains shape of the stir zone, FeAl3 particles is spread more evenly in matrix of Al  due to the stir process during the welding process. Hardness tests showed that the weld metal is softer than the base metal. Keywords: Aluminum, welding, FSW
SIFAT MEKANIK DAN CACAT PENYUSUTAN (SHRINKAGE) AKIBAT VARIASI KOMPOSISI CAMPURAN DAUR ULANG POLYETHYLENE PADA INJECTION MOULDING Badri, Muhammad Ghilman; Darsin, Mahros; Dwilaksana, Dedi
ROTOR Vol 7, No 1 (2014)
Publisher : ROTOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (303.716 KB)

Abstract

Injection moulding is one process to form plastic by compress the melted plastic in a closed die. The raw material for the process either pure plastic pellet or mixed with recycled plastics. this research focused on finding the acceptable percentage of recycled  the raw material in term of tensile strengh and shrinkage. The composition is varied from 0% to 100% of polyethylene. Tensile test shows that the more percentage of recycled the lower is the  tensile strenght. on the other hand, the more the recycled composition the highernis shrinkage number. Both decrease of tensile strengh and increase of shrinkage are linearly. Recycled plastic in the raw material makes the composition be not uniform. It leads misrun defect, i.e. the melted plastic solidified before it reach the destined cavity in the mold. Moreover, it also creates more void in the parts. The highest tensile strength of 19.10 N/mm2 when no recycled mixed in, whereas the minimum of 12.05 N/mm2 achieved when 100% recycled was applied. Recycled Composition of 100% also increased by 9,82% compare to pure plastic. Keywords: Recycled plastic, tensile strength, shrinkage.
Analisis Kekuatan Tarik dan Kekasaran Kawat Tembaga Hasil Drawing akibat Variasi Persentase Reduksi Firman, Mohammad; Darsin, Mahros; Arbiantara, Hari
ROTOR Vol 6, No 1 (2013)
Publisher : ROTOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (379.218 KB)

Abstract

Wire drawing is cold working process to reduce the cross-sectional area. The value of reduction is different in every process, depend on the needs and working parameters. The degree of reduction causes differences of copper wire rod in the characteristics and quality, such as its tensile strength and roughness. The purpose of this research is to determine the influence degree of reduction to the tensile strength and roughness of copper wire. The research method is comparing the tensile strength and roughness of copper wires control with drawed copper wires, without repetition stage. The speciments used in this research are pure copper rods (99.9%) with 3.1 mm, 3.2 mm and 3.25 mm in diameter and 2.8 mm of die output, so will get the degree of reductions are 19%, 23% and 26%. The results of this research was the wire drawing process increase the tensile strength of copper rods from 86.87 MPa to 100.74 MPa on 19% reduction. On 23% reduction the tensile strength increase from 82.24 MPa to 105.62 MPa. The greatest increase of tensile strength was result by 26% reduction, it was from 86.87 MPa to 115.36 MPa With the more of degree of reduction on the drawing process led the increase of tensile strength will be greater. This research also obtained the result that the wire drawing process result the decrease roughness of copper rods from 0,144 μm to 0,089 μm on 19% reduction, from 0.146 μm to 0.087 μm on 23% reduction and the copper rod roughness decrease from 0.159 μm to 0.083 μm on 26% reduction. The increase of degree of reduction produce insignificantly result of surface roughness changing. Keywords: Roughness, Tensile Strength, Wire Drawing, Reduction, Copper
PENGARUH PROSES PENGADUKAN TERHADAP KARAKTER ADONAN DAN SIFAT BIODEGRADABLE PLASTIC YANG DIBUAT DARI BUNGKIL BIJI JARAK PAGAR Arbiantara, Hari; Darsin, Mahros; Lindriati, Triana
ROTOR Vol 6, No 1 (2013)
Publisher : ROTOR

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (346.436 KB)

Abstract

Manufacture of biodegradable plastics in this study begins with making the dough using a single screw extruder, then the dough is molded by using a compression molding machine. The basic material used is a mixture of jatropha seed meal, corn starch, CMC (composition 7: 2: 1). This study aimed to study the effect of Helic corner and screw compression ratio of the batter character and biodegradable plastic produced. Helic screw angle was varied from 2,5o; 5o; 7.5 ° and screw compression ratio varied from 1.5; 2.5; 3.5. The results showed an increase in the angle of screw Helic simplify the process of molding (lowering the value of Tg, Tm, ΔH and texture of the dough) and to improve the mechanical physical properties of the biodegradable plastic produced (tensile strength, strain increases while the thickness and Water Vapor transmition rate decreases). Improved compression ratio increase and decrease the thermal properties of dough texture and increase the tensile strength and strain, decrease the thickness and Water Vapor transmition rate of biodegradable plastic produced. Keyword: biodegradable plastic, mold, helical degree, compression ratio
ANALISIS SIFAT MEKANIK HASIL PENGELASAN ALUMINIUM AA 1100 DENGAN METODE FRICTION STIR WELDING (FSW) Mahros Darsin; Sumarji Sumarji; Angger Sudrajat
ROTOR Vol 5 No 1 (2012)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (603.174 KB)

Abstract

Aluminum and aluminum alloys have properties that are less well when coMPared to steel, such as specific heat and has a high conductivity. They are also easily oxidized and form an aluminum oxide Al2O3 which have a high melting point. Consequently, when they are welded the fusion between base and weld metal will be blocked. Moreover, if the cooling process is too fast it will form a smooth cavity ex-pouch of hydrogen. Friction stir welding (FSW) is a challenging alternative for joining aluminum alloy. In FSW, process occur in the solid state (solid state joining). In this research, some attempts were carried out to find the best quality of welding, in term of mechanical properties and microstructure. Tool rotation speed was varied at 780, 980, 1120 rpm. Whereas, feed rate used was keep constantly at 15 mm/min. The material to be welded is a- 4.0 mm thick aluminum AA 1100 strips. Result showed that the highest strength obtained is 56.528 MPa at 1120 rpm and the lowest strength obtained is 38.472 MPa at 980 rpm. Wormholes and the lack of penetration defects are the main things that reduce the tensile strength. From micro observations known on the grains shape of the stir zone, FeAl3 particles is spread more evenly in matrix of Al  due to the stir process during the welding process. Hardness tests showed that the weld metal is softer than the base metal. Keywords: Aluminum, welding, FSW
PENGARUH PARAMETER SPRAY GUN TERHADAP KEKILAPAN PADA PELAPISAN BAJA KARBON RENDAH (ST37) Miftakhul Rohman; Mahros Darsin; Rika Dwi Hidayatul Qoryah
ROTOR Vol 13 No 1 (2020)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (473.404 KB) | DOI: 10.19184/rotor.v12i1.13933

Abstract

Two purposes of painting of the automobile body, i.e. protection and aesthetic. For the aesthetic one, scientifically measured its glossiness. The purpose of this study was to determine the effects of painting parameters using a spray to its glossiness. Three parameters varied were: (i) comparison of paint composition and thinner (1:1.2; 1:1.4 and 1:1.6), (ii) spraying distance (110 mm, 130 mm and 150 mm), and air pressure (3.5 bar; 4.5 bar and 5.5 bar, while the glossiness measured in gloss unit (GU) using a gloss meter. The experimental design method used was the response surface method with Box-Behnken design. A series of tests were carried out prior to ANOVA and optimization with Minitab: (i) lack of fit test, (ii) simultaneous parameter test, (iii) the coefficient of determination test, (iv) identical test, (v) independent test and (vi) normal distribution test. Out of three parameters, the most influential one is composition with a coefficient of mathematical equation of 6.592. In this study, the highest value in the 10th trial was 57.3 GU which was occurred when the parameters used were: distance of 130 mm, composition 1: 1.6 and pressure 3.5 bar. On the contrary, the smallest value GU in the 7th experiment was 35 GU with a distance of 110 mm, composition 1:1.4 and pressure 5.5 bar. From processing data using Minitab, the maximum gloss value was 58.76 GU with distance 116.86 mm, composition 1: 1.6 and pressure 3.5 bar. Keywords: painting, Box-Behnken design, gloss meter
Analisis Kekuatan Tarik dan Kekasaran Kawat Tembaga Hasil Drawing akibat Variasi Persentase Reduksi Mohammad Firman; Mahros Darsin; Hari Arbiantara
ROTOR Vol 6 No 1 (2013)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (379.218 KB)

Abstract

Wire drawing is cold working process to reduce the cross-sectional area. The value of reduction is different in every process, depend on the needs and working parameters. The degree of reduction causes differences of copper wire rod in the characteristics and quality, such as its tensile strength and roughness. The purpose of this research is to determine the influence degree of reduction to the tensile strength and roughness of copper wire. The research method is comparing the tensile strength and roughness of copper wires control with drawed copper wires, without repetition stage. The speciments used in this research are pure copper rods (99.9%) with 3.1 mm, 3.2 mm and 3.25 mm in diameter and 2.8 mm of die output, so will get the degree of reductions are 19%, 23% and 26%. The results of this research was the wire drawing process increase the tensile strength of copper rods from 86.87 MPa to 100.74 MPa on 19% reduction. On 23% reduction the tensile strength increase from 82.24 MPa to 105.62 MPa. The greatest increase of tensile strength was result by 26% reduction, it was from 86.87 MPa to 115.36 MPa With the more of degree of reduction on the drawing process led the increase of tensile strength will be greater. This research also obtained the result that the wire drawing process result the decrease roughness of copper rods from 0,144 μm to 0,089 μm on 19% reduction, from 0.146 μm to 0.087 μm on 23% reduction and the copper rod roughness decrease from 0.159 μm to 0.083 μm on 26% reduction. The increase of degree of reduction produce insignificantly result of surface roughness changing. Keywords: Roughness, Tensile Strength, Wire Drawing, Reduction, Copper
SIFAT MEKANIK DAN CACAT PENYUSUTAN (SHRINKAGE) AKIBAT VARIASI KOMPOSISI CAMPURAN DAUR ULANG POLYETHYLENE PADA INJECTION MOULDING Muhammad Ghilman Badri; Mahros Darsin; Dedi Dwilaksana
ROTOR Vol 7 No 1 (2014)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (303.716 KB)

Abstract

Injection moulding is one process to form plastic by compress the melted plastic in a closed die. The raw material for the process either pure plastic pellet or mixed with recycled plastics. this research focused on finding the acceptable percentage of recycled  the raw material in term of tensile strengh and shrinkage. The composition is varied from 0% to 100% of polyethylene. Tensile test shows that the more percentage of recycled the lower is the  tensile strenght. on the other hand, the more the recycled composition the highernis shrinkage number. Both decrease of tensile strengh and increase of shrinkage are linearly. Recycled plastic in the raw material makes the composition be not uniform. It leads misrun defect, i.e. the melted plastic solidified before it reach the destined cavity in the mold. Moreover, it also creates more void in the parts. The highest tensile strength of 19.10 N/mm2 when no recycled mixed in, whereas the minimum of 12.05 N/mm2 achieved when 100% recycled was applied. Recycled Composition of 100% also increased by 9,82% compare to pure plastic. Keywords: Recycled plastic, tensile strength, shrinkage.
PENGARUH PROSES PENGADUKAN TERHADAP KARAKTER ADONAN DAN SIFAT BIODEGRADABLE PLASTIC YANG DIBUAT DARI BUNGKIL BIJI JARAK PAGAR Hari Arbiantara; Mahros Darsin; Triana Lindriati
ROTOR Vol 6 No 1 (2013)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (346.436 KB)

Abstract

Manufacture of biodegradable plastics in this study begins with making the dough using a single screw extruder, then the dough is molded by using a compression molding machine. The basic material used is a mixture of jatropha seed meal, corn starch, CMC (composition 7: 2: 1). This study aimed to study the effect of Helic corner and screw compression ratio of the batter character and biodegradable plastic produced. Helic screw angle was varied from 2,5o; 5o; 7.5 ° and screw compression ratio varied from 1.5; 2.5; 3.5. The results showed an increase in the angle of screw Helic simplify the process of molding (lowering the value of Tg, Tm, ΔH and texture of the dough) and to improve the mechanical physical properties of the biodegradable plastic produced (tensile strength, strain increases while the thickness and Water Vapor transmition rate decreases). Improved compression ratio increase and decrease the thermal properties of dough texture and increase the tensile strength and strain, decrease the thickness and Water Vapor transmition rate of biodegradable plastic produced. Keyword: biodegradable plastic, mold, helical degree, compression ratio
PEMILIHAN KAPASITAS BATERAI PENYIMPAN ENERGI LISTRIK DARI ENERGI SURYA Irawan Bambang; Hadi Samsul; Darsin Mahros; Fatkhur Rohman
ROTOR Vol 11 No 2 (2018)
Publisher : Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (790.946 KB) | DOI: 10.19184/rotor.v11i2.9337

Abstract

This paper is concern on the using of some solar batteries for storing the energy from the solar panel. The battery used is a 100 WP solar cell with the appliances. Research was carried out in an open air with real condition without treatment for two months continuously during hot dry season in Malang city, Indonesia. It is concluded that emerged energy from the solar panel was 550 WH or equal to 12 V of 45 AH. During the electric charging from solar panel to the battery, the flowing current vary between 2 A to 6 A. The battery charging only started after 7 am when the voltage was above 12 V. For the solar panel 100 WP to use battery with the storage capacity above 40 AH. Keywords: battery, solar panel, energy
Co-Authors Agil Widhy Azizi Agus Triono Ahmad Adib Rosyadi Ahmad Iqbal Fawaid Ahmad Syuhri Alfi Hasan Andi Sanata Angger Sudrajat Angger Sudrajat, Angger Antonius Cahya P Aris Zainul Muttaqin Bambang Irawan Boy Arief Fachri Cahya Alief Prasetyo Cahya Alief Prasetyo Chen, Zhan Danang Yudistiro Danny Febriansyah Dedi Dwilaksana Deny Tomy Andrianto Digdo Listyadi, Digdo Dinata, Gerry Gardika Surya Doddy Parningotan Doohan Taqdissillah Dwi Djumhariyanto Faradin Adyatama Fatkhur Rohman Firman Gustiawan Gaguk Jatisukamto Hadi Samsul Halmi Palwa Guna Hari Arbiantara Hari Arbiantara Basuki Hari Arbiantara, Hari Hayun Indra Nur Iman Hutama, Tri Surya Imam Rudi Sugara Indra Surya Iwanata Intan Hardiatama Intan Hardiatama Joni Anggianto Khamdan Khavivi Kusno Kusno Laily Ilman Widuri Luviandy, Allen Miftakhul Rohman Mochamad Asrofi Mochamad Edoward Ramadhan Mochamad Edoward Ramadhan Mochammad Edoward Ramadhan Mohammad Firman Mohammad Firman, Mohammad Muh Nurkoyim Kustanto Muhammad Dimyati Nashrullah Muhammad Fadhlurrohman Faqih Muhammad Ghilman Badri Muhammad Ghilman Badri, Muhammad Ghilman Muhammad Sholihul Amin Muhammad Trfiananto Nasrul Ilminnafik Naufal Fardio Albajili Nugraha, Dicky Aprilian Pasang, Timotius Pieter Muhammad Iko Marrendra Prayogo Alim Pangestu Puranggo Ganjar Widityo R. Puranggo Ganjar Widityo Rahma Rei Sakura Raihaan . Renald Rochman Mauludy Rika Dwi Hidayatul Qoryah Robertoes Koekoeh Koentjoro Wibowo Robertus Sidartawan Sains Ilham Akbar Salahuddin Junus Salman Al Farisi Siregar Santoso Mulyadi Sari, Herninda Ayu Meylinda Soesatijono Soesatijono Soesatijono Soesatijono Sumarji Timotius Pasang TRI HANDOYO Tri Surya Hutama Triana Lindriati wazirotus sakinah Yohan Rizal Kharisma Yuni Hermawan Zhan Chen