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All Journal Dinamika Hukum ROTOR: JURNAL ILMIAH TEKNIK MESIN Indonesian Journal of Science and Technology R.E.M (Rekyasa Energi Manufaktur) Jurnal Journal of Mechanical Engineering Science and Technology Dinamika Teknik Mesin Animal Production : Indonesian Journal of Animal Production SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Jurnal POLIMESIN Jurnal Ilmiah Fillia Cendekia Revitalisasi : Jurnal Ilmu Manajemen INTEGRITAS : Jurnal Pengabdian
Sumarji
Universitas Jember
Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Veterinary Other

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ANALISIS KEKERASAN, CACAT LAS, DAN STRUKTUR MIKRO PADA SAMBUNGAN T PADUAN ALUMINIUM 6061 T6511 HASIL GAS METAL ARC WELDING (GMAW) DENGAN VARIASI KUAT ARUS Yoedhawan, Ahmad Jukliv Pandu; Sumarji, Sumarji
ROTOR Vol 7, No 2 (2014)
Publisher : ROTOR

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Abstract

AA 6061 T6511 is an aluminum alloy with composition Al 96,61 Wt %, Cr 0,04 Wt %, Cu 0,15 Wt %, Fe 0,7 Wt %, Mg 1,15 Wt %, Mn 0,15 Wt %, Si 0,8 Wt %, Ti 0,15 Wt %, and Zn 0,25 Wt %. Gas Metal Arc Welding (GMAW) is a welding process that the energy obtained from an electric arc. Arc welding to occur between the surface of the workpiece with the electrode wire coming out of the nozzle together with the protective gas. GMAW AA 6061 T6511 using filler metal ER 5356 with composition of 0,2% Mn, 0,25% Si, 0,4% Fe, 5,5% Mg, 0,2% Cr, 0,1% Cu, 0,2% Ti, 0,1% Zn, and 0,0003% Be. From a visual test known GMAW process with strong currents 120 amperes generates heat input of 0,504 kJ/mm, GMAW process with strong currents of 150 amperes generates heat input of 0,837 kJ/mm, and the GMAW process with strong currents of 180 amperes generates heat input of 1,168 kJ/mm. From inspection of defects on the surface was found that the results of GMAW are undersize weld, excessive convexity, excessive undercut, overlap, and incomplete fusion. From inspection of surface defects in GMAW welding of AA 6061 T6511 are spherical porosity and wormholes porosity. The area has the highest hardness in the heat affected zone is located at GMAW AA 6061 T6511 180 amperes is equal to 51,33 BHN, the lowest hardness of 24 BHN which is located on the base metal area on GMAW AA 6061 T6511 120 amperes, and microstructure observations show an increase in diameter the highest point on the AA 6061 T6511 from 61 μm after GMAW process 180 amperes becomes 21 μm. Keywords: AA 6061 T6511, Gas Metal Arc Welding, hardness, microstructure, weld defects.
PENGARUH VARIASI KONSENTRASI INHIBITOR EKSTRAK KULIT BUAH KAKAO TERHADAP LAJU KOROSI PIPA BAJA KARBON A53 PADA MEDIA AIR LAUT Purnomo, Adi; Sumarji, Sumarji
ROTOR Vol 8, No 1 (2015)
Publisher : ROTOR

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Abstract

Corrosion is a chemical phenomenon that occurs in metal materials in a wide variety of environmental conditions. always good corrosion causing losses losses that are directly or indirectly impacted. one way of corrosion prevention is the addition of corrosion inhibitors. Corrosion inhibitor is a substance that is added to the medium to prevent or reduce the rate of corrosion of metals in the environment . In this study , the authors make use of a corrosion inhibitor cocoa peel extract from the rind of the results of maceration with the variation of the cocoa peel extract concentration was 0 ppm , 500 ppm , 1000 ppm , 1500 ppm and 2000 ppm in sea water media using specimens of carbon steel pipe A53,The purpose of this study was to determine the effect of variations in the concentration of cocoa peel extract against corrosion rate and efficiency of inhibitors that occur in the carbon steel pipe A53 and analysis form macroscopic and microscopic corrosion that occurs in the specimen by using a camera and test equipment microscope with 200x magnification. From the results of this study concluded that there are significant variations in the concentration of the tea leaf extract against corrosion rate of carbon steel pipe A53. At 2000 ppm concentration variation, occurred average value of the lowest rate of corrosion inhibitor that is 0,2384 mdd and highest efficiency 83.37 %.
PENGARUH VARIASI KONSENTRASI INHIBITOR EKSTRAK KULIT BUAH KAKAO TERHADAP LAJU KOROSI PIPA BAJA KARBON A53 PADA MEDIA AIR LAUT Purnomo, Adi; Sumarji, Sumarji
ROTOR Vol 8, No 1 (2015)
Publisher : ROTOR

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Abstract

Corrosion is a chemical phenomenon that occurs in metal materials in a wide variety of environmental conditions. always good corrosion causing losses losses that are directly or indirectly impacted. one way of corrosion prevention is the addition of corrosion inhibitors. Corrosion inhibitor is a substance that is added to the medium to prevent or reduce the rate of corrosion of metals in the environment . In this study , the authors make use of a corrosion inhibitor cocoa peel extract from the rind of the results of maceration with the variation of the cocoa peel extract concentration was 0 ppm , 500 ppm , 1000 ppm , 1500 ppm and 2000 ppm in sea water media using specimens of carbon steel pipe A53,The purpose of this study was to determine the effect of variations in the concentration of cocoa peel extract against corrosion rate and efficiency of inhibitors that occur in the carbon steel pipe A53 and analysis form macroscopic and microscopic corrosion that occurs in the specimen by using a camera and test equipment microscope with 200x magnification. From the results of this study concluded that there are significant variations in the concentration of the tea leaf extract against corrosion rate of carbon steel pipe A53. At 2000 ppm concentration variation, occurred average value of the lowest rate of corrosion inhibitor that is 0,2384 mdd and highest efficiency 83.37 %.
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

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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
EVALUASI KOROSI BAJA KARBON RENDAH ASTM A36 PADA LINGKUNGAN ATMOSFERIK DI KABUPATEN JEMBER Sumarji, Sumarji
ROTOR Vol 5, No 1 (2012)
Publisher : ROTOR

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Abstract

Atmospheric corrosion is corrosion or degradation of materials in the atmosphere that occurs naturally. The corrosion rate varies for different materials and is influenced by several environmental factors, such as: humidity, temperature, and pollutant (NOx, SOx, Cl-, CO2). This research studies the corrosion rate of low carbon steel ASTM A36 in kabupaten Jember environment with different area. The location of research was done in the side of beach (Watu Ulo), the centre of city (Gajah Mada street) and the mountain range (Rembangan). The dimension of test racks and specimens for atmospheric exposure were prepared in accordance with the ASTM G 50 – 76. The cleaning of all corrosion products were done in accordance with the ASTM G 1- 90. The result shows that the highest corrosion rate is in the Watu Ulo as big as 2,82 mpy, than Gajah Mada street as big as 0,919 mpy. The lowest corrosion rate is in Rembangan as big as 0,844 mpy. From the micro photographs, it is found that low carbon steel ASTM A36 corrode by uniform and pitting formation. Keywords: atmospheric corrosion, uniform, pitting
STUDI PERBANDINGAN KETAHANAN KOROSI STAINLESS STEEL TIPE SS 304 DAN SS 201 MENGGUNAKAN METODE U-BEND TEST SECARA SIKLIK DENGAN VARIASI SUHU DAN PH Sumarji, Sumarji
ROTOR Vol 4, No 1 (2011)
Publisher : ROTOR

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Abstract

There are many failures in a structure that is caused by the damage of the metal that support them. One of the problem which can cause the damage of the metal is corrosion. With its action, corrosion can make a metal  become thin, and in some cases can make a crack and fracture. Some factors are determine how fast the process is occured in corrosion process, for examples are the oxygen concentration, degree of acidity, and temperature. The purpose of this research is to know how is the role of that factors in corrrosion process. This research is implemented in three condision of temperatures (300 C, 500 C, 700 C), variation of HCl’s pH (0, 1, 2), and cycle environments condition. That will be combined and will be tested for about 7 days. After this execution, material will be measured for the decrease of the weight to give the value of corrosion rate. From this experiment, the rate of corrosion rises by increasing temperature and the decreasing pH condition. In all condition of this experiment, the SS 304 Stainless Steel has the better resistant to the corrosion in HCl environment.  The highest corrosion rate of cycle condition is 36.119,4 mpy for SS 201 Stainless Steel, and 515,5 mpy for SS 304 Stainless Steel. Form the micro photographs of corrosion happened on SS 201 Stainless Steel is pitting corrosion and SS 304 Stainless Steel is uniform corrosion. Keywords: Stainless Steel, Cycle and Corrosion
KOMPARASI EFISIENSI MATERIAL BAJA KARBON St 37, BAJA KARBON St 41 DAN BAJA KARBON St 60 TERHADAP LAJU KOROSI DI MEDIA AIR MUARA SUNGAI (PAYAU) DENGAN METODE ELEKTROKIMIA Nur Afandi, Yusuf; Sumarji, Sumarji
ROTOR Vol 6, No 2 (2013)
Publisher : ROTOR

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Abstract

Mouth of the river is the meeting place of river water and sea water . water estuaries (brackish water) has asodium chloride content of between 1% -2.5 whether its from natural sources around the surrounding river water or a mixture of sea water . many construction or structure that is attached to the mouth of the river environment made of metal materials, especially carbon  steel.  the use of  steel  in building  structures  in estuaries  susceptible  to  corrosion  due  to  environmental  water  containing  chemical  elements  that  are corrosive. Factors  affecting  corrosion  such  as  temperature,  acidity  (pH),  salinity  (NaCl),  the  levels  of chloride  (Cl),  the  levels of  sulfate  (SO) as well as dissolved oxygen, causing easily corroded carbon  steel. This study aims to determine the Comparative Efficiency of Steel St 37, St 41 Steel and Steel st 60 on the rate of corrosion  in aqueous media estuaries with  tool Potensiostat methods. This research  is an experimental laboratory to design the post-test group design. From the results obtained data show the results of corrosion rate measurements made  in  this study  that  the greatest rate of corrosion occurring on  the steel material St 37 is 29.527 mpy, St 41  steel was 27.548 mpy, and  steel St 60  is 24,493 mpy. The  results  showed  that  the corrosion rate of steel st 37 has a very large corrosion rate in comparison steel and carbon steel st 41 high st 60. From the observation  in micro on  the  trid specimen  three  is corrosion  that resembles a uniform or evenly corrosion. A  form of  corrosion  that  results  in a uniform attack on  the  entire  surface of  the metal. Keywords: Estuaries, The Rate of Corrosion
Pengaruh Variasi Fraksi Volume Filler Terhadap Kekuatan Mekanik Komposit Sandwich Polyester Serat Kenaf Core Styrofoam Sentosa, Aman; Sumarji, Sumarji; Djumhariyanto, Dwi
ROTOR Vol 8, No 2 (2015)
Publisher : ROTOR

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Abstract

Composite sandwich reinforcement  kenaf fiber polyester with Styrofoam core is an alternative material that has the potential to be developed as an application in various fields with an excess of nature that is strong, lightweight, rigid, able to withstand bending loads, impact, vibration damping and sound. This study is intended to overcome the problems of fishermen Muncar - Banyuwangi in the selection of materials manufacture of safe fish robust and insulated to preserve or maintain the freshness of the fish catch of fishermen low temperature. This study was conducted to determine the effect of variations in fiber volume fraction of the increase in impact strength and bending composite materials sandwich.Untuk get impact strength values ​​using the tool impact test with a maximum capacity of 300 joules specifications, pendulum mass of 20.9 kg, 0.83 m long pendulum arm, while to obtain bending strength values ​​using a universal testing machine capacity of 300 KN. Variations were used in this study is the percentage of fiber volume fraction of 10% fiber, 20%, 30%, and 40%. The results showed that the variation of fiber volume fraction of 40% had values ​​higher impact strength and bending of 0.30 Joules / mm² and 5,65MPa than the fiber volume fraction of 10% has impact and bending strength values ​​were lower at 0.14 joules / mm2 and 0.30 MPa. So in this study limits the variation of fiber volume fraction of 10% to 40% proved that if the greater the percentage of fiber volume fraction value will increase the value of impact strength and bending in composite sandwich. Keywords: fiber volume fraction, impact strength and bending, composite sandwich
The Effect of Particle Dispersion due to Mixing Speed on Spent Coffee Ground Composites Sumarji, Sumarji; Ridha, Fabrobi; Dwilaksana, Dedi; Syuhri, Ahmad; Raihaan, Raihaan
Indonesian Journal of Science and Technology Vol 4, No 2 (2019): IJOST: VOLUME 4, ISSUE 2, 2019
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v4i2.18175

Abstract

Composites using bio-materials with unique properties, such as spent coffee ground were developed for composite fillers. This study was conducted to produce samples under various mixing speed conditions. This study also determined effect of mixing speeds on particle homogeneity as well as composite dispersion in the final product. The composite dispersion was determined by an index based on a standard deviation of free-path spacing of filler particles using a digital microscope. Results showed that when using high-speed mixing, particle tends to agglomerate with particle clumps. We also obtained that faster mixing speed results more homogeneous mixture compared to slower speed. In short, slower speed can reach similar result in homogeneity levels, but it would require longer time for the mixing process.
HERMENEUTIKA BHABINKAMTIBMAS PERSPEKTIF IMPLEMENTASI PEMOLISIAN MASYARAKAT BERBASIS KEMANDIRIAN DESA DALAM MEWUJUDKAN KEAMANAN DAN KETERTIBAN DI WILAYAH DESA TANGKIL KECAMATAN SRAGEN KABUPATEN SRAGEN SUMARJI, SUMARJI
Dinamika Hukum Vol 9 No 2 (2018): DINAMIKA HUKUM
Publisher : Dinamika Hukum

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Abstract

The purpose of this research is to find out what the basics of Bhabinkamtibmas consider to build community policing based on village independence to realize security and order in the Tangkil Village of Sragen Subdistrict Sragen, as well as the obstacles that Bhabinkamtibmas have in building community policing to realize security and order in Tangkil Village in Sragen Subdistrict Sragen Regency. The background of the research is that the research was conducted in Tangkil Village in Sragen Subdistrict Sragen Regency. The research method consists of hermenetic research approach that is the data collection technique used by the method of field research through interview and literature study research, then from all the collected data done by qualitative analysis. Research findings show that Bhabinkamtibmas's role in building community policing is through working professionally by implementing community development, early detection and mediation / negotiation aimed at creating conducive conditions in rural areas. The obstacles experienced by Bhabinkamtibmas in maintaining and implementing security and order in the Tangkil Village area Sragen Subdistrict Sragen Regency: Internal Barriers: Binmas Unit / Bhabinkamtibmas Unit as the mainstay of the main government is still a duplicate of the work, Limitation of the ability of Bhabikamtibmas especially in the provision of construction material as well as communication techniques with the community, There is still a Bhabinkamtibmas assignment that is more than one hosted village. The absence of a continuous socialization of the other functions of the Police (Intel, reserse, traffic, sabhara) and Binmas's function regarding Bhabinkamtibmas and the empowerment of the Police. External Obstacles: Covering the presence of an Independent Police and Community Partnership Offices (BKPM) in both villages and subdistricts, the main activity of the policymakers of Bhabinkamtibmas to establish partnerships with the community has not been properly facilitated. The Polri and Community Partnership Forum (FKPM) in villages / villages as a vehicle for communication between the National Police and the community concerned with issues of social and social issues and seeking solutions on the basis of a collective agreement is less effective, this is due to the role Police in relation to Bhabinkamtibmas Officers do not play the maximum role because of the complexity and duplication of work. How to overcome the problem of Obtimalization of Bhabinkamtibmas in the construction area can be done through Human Resource Improvement through education, provision of Police and Community Partnership Center (BKPM), Placement of one village / village Bhabinkamtibmas personnel, Placement of Bhabinkamtibmas officers domiciled in their respective residential areas and professionalism with not duplicate work. Key words : Bhabinkamtibmas, community policing
Co-Authors A. Faisol Adi Purnomo Adi Purnomo Ahmad Jukliv Pandu Yoedhawan Ahmad Jukliv Pandu Yoedhawan, Ahmad Jukliv Pandu Ahmad Syuhri Aman Sentosa Aman Sentosa, Aman Amirur Ridho Muhammad Andi Sanata Angger Sudrajat Angger Sudrajat, Angger Aris Zainul Muttaqin Arisyahidin Arisyahidin Chamim Rosyidin Danny Febriansyah Daroini, Ahsin Daroni, Ahsin Dedi Dwi Laksana Dedi Dwi Laksana Dedi Dwilaksana Digdo Listyadi, Digdo Dwi Djumhariyanto Dwi Djumhariyanto Dwi Djumhariyanto, Dwi Esti Widasih G. Djatisukamto Gaguk Jatisukamto Haidzar Nurdiansyah Hari Arbiantara Hary Sutjahjono, Hary Imam Sholahuddin, Imam Intan Hardiatama Iwan Faisal Hidayat khoirul fahmi aziz Lutfi, Dwiki Alfikriyadi M Asrofi Mahros Darsin Masfeya Eka Hermiansyah Masruri Wardhana Melany Pilatusalim Mochamad Asrofi Muhammad Abduh Muhammad Trifiananto Naafi' ul Amri Nasrul Ilminnafik Naufal Fardio Albajili Naufan Arviansyah Nova Monica Aulia Safitri Novel Bagas Satrio Wibowo Pratama Yuli Arianto Prayogo Alim Pangestu Puanggo Ganjar Widityo Puranggo Ganjar Widityo R. Puranggo Ganjar Widityo Rahma Rei Sakura Raihaan, Raihaan Rama Wira Drana Wasistha Ramli Firdaus Kusnadi Ridha, Fabrobi Rizka Febby Rofi'ah Robertoes Koekoeh KW Rony Agista Apriansyah Saifurridzal Saifurridzal Salahuddin Junus wazirotus sakinah Yanuar Alditya Nugraha Yusuf Nur Afandi Yusuf Nur Afandi, Yusuf