Jurnal MEKANIKAL
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EKSTRAK KULIT NANAS SEBAGAI INHIBITOR DALAM MENGHAMBAT LAJU KOROSI PADA BAJA ST 42 DALAM MEDIA NaCl 3,5%
Full text linkThis study aims to determine the corrosion rate of ST 42 steel using pineapple peel extract inhibitor in 3.5% NaCl media with variations without inhibitor, 100 ppm, 200 ppm, 300 ppm, 400 ppm, and 500 ppm. Immersion time for 168, 336, and 504 hours. The method used to measure the corrosion rate is weight loss. This research was conducted at the Mechanical Engineering Laboratory, Faculty of Engineering and the Laboratory of Pharmacy Study Program,Faculty of Mathematics and Natural Sciences, Tadulako University. The results showed that pineapple peel extract could inhibit the corrosion rate on ST 42 steel, at the percentage of immersion 100 ppm, 200 ppm, 300 ppm, 400 ppm, and 500 ppm inhibitor of pineapple peel extract. Especially in the 500 ppm immersion variation with the lowest corrosion rate at an immersion time of 168 hours, which is 0.419 mpy, and has the highest efficiency at an immersiontime of 168 hours, which is 83.378%. Corrosion rate increased with increasing immersion time and decreased with increasing varation of pineapple peel extract inhibitor
PENGARUH KECEPATAN LAS TERHADAP DISTORSI HASIL PENGELASAN SMAW DENGAN SIMULASI NUMERIK
Full text linkThis study aims to determine the effect of welding speed on the distortion of SMAW welding results. Using a welding speed of 5.21mm/s, 4mm/s, with a v seam of 60° and a welding current of 80 Amperes, using a 120 mm x 100 mm specimen. This research was conducted experimentally and in simulation at the Tadulako University Mechanical Engineering Computing and Simulation Laboratory. And simulation testing using ANSYS Workbench 15.0 with transient thermal and static structural analysis models. The results of the welding speed test for the distortion of SMAW welding results. Shows that, the faster the welding time, the smaller the increase in the distortion value in the material, conversely, the longer the welding time, the greater the increase in the distortion value, this occurs due to the effect of welding speed. bigger and vice versa. The biggest distortion value is at a welding speed of 3.4 mm/s of 0.0125° in the experimental and 0.0095° in the numerical simulation, while the smallest distortion value is at a welding speed of 5.21 mm/s of 0.0052° in the experimental and 0.0037° in numerical simulations
ANALISIS LAJU KOROSI BAJA ST-60 PADA MEDIA AIR GAMBUT DAN AIR HUJAN
Full text linkThe use of metals become an integral part of human life. Iron and steel is one material that is very widle used for the purposes of human life. All life segments, ranging from kitchen equipment, transportation and building skeletons using steel. The steel that is often used is inthe form of low carbon steel such as Baja ST 60. This study uses the method of weight loss or weight loss is a method that can be used to obtain the corrosion rate. The principle of this method is to calculate the amount of material lost or heavy loss after testing immersion in accordance with ASTM G 31-72 standards. Based on the analysis of the data carried out can be obtained conclusions Corrosion with variations in immersion time 3 weeks without being exposed to greater corrosiveness compared to 2 weeks with 1 week exposed because in the variation of 3 weeks without being exposed to steel longer interact with corrosion media compared to 2 weeks with presented 1 week while the corrosion rate of peat water is greater than rainwater because the pH in peat water is lower than rainwater
ENGARUH WAKTU PENGELASAN ALUMINIUM TERHADAP KEKUATAN BENDING PADA HASIL FRICTION WELDING
No full textThis study aims to determine the magnitude of the influence of time during friction, between aluminum that has been given a microstructure by the Friction welding method, to determine the level of strength and structure of the joints tested by bending techniques, the tool used to test the strength level of aluminum is a lathe with material specimens. The aluminum used is 6063 T5, after the specimen is carried out using a lathe, a bending test is carried out to determine the hardness of the microstructure. The test was carried out in the materials testing laboratory, majoring in mechanical engineering, faculty of engineering. Based on the results of the bending test, the highest level in 90 seconds gets a value of 523.92 MPa followed by the lowest time which is 30 seconds which gets a value of 476.73 MPa while the second test time is 60 seconds. The welding technique using the friction welding method with a friction time of 60 seconds gets a value of 498.93 MPa. Meanwhile, the strength of the aluminum friction within 90 seconds obtained a value of 37.282 kg/mm2 followed by friction with a second vulnerable time of 60 seconds which obtained a strength value of 36.622 kg/mm2. While the lowest strength value is found within 30 seconds which gets a strength value of 35.665 kg/mm2. The results of microstructure observations due to the small friction time the microstructure still looks large compared to the long friction time given to the specimen, the microstructure is getting smaller and coalesces in the interface area
KINERJA TURBIN ANGIN DARRIEUS DUA SUDU GERAK BERPROFIL NACA 0028 SECARA EKSPERIMEN
Full text linkWind energy is one type of renewable energy which is not only clean andenvironmentally friendly but also has abundant and is obtained free of charge in the natural. The process of converting kinetic energy in the wind into mechanical energy requires a turbine. Darrieus turbine is a device that converts wind energy that moves from various directions into mechanical energy on a shaft that moves in one direction. This study aims to determine the performance of a two-blade Darrieus turbine with the NACA 0028 profile experimentally. The wind tunnel, Darreus turbine, and load-bearing construction were designed and manufactured by researchers. Data collection of wind velocity, load, and rotation using standard equipment. The results of the study show that the turbine power coefficients are 35.57%, 23.55%, 23.2%, and 20.05% at wind velocity of 6.04, 7.08, 7.25, and 7.59 m/s, respectively
SIMULASI CFD PADA TRUK STANDAR DENGAN BAK TERBUKA DAN TERTUTUP
Full text linkThe aerodynamic load in the vehicle will affect the stability and fuel consumption in operation. One way to overcome this is to reduce the coefficient drag, which is correlated with the aerodynamic drag force on the vehicle. This study aims to determine the drag coefficient and the airflow characteristics of standard trucks using open and closed boxes. The results show that the truck with a closed box produces a lower drag coefficient than the open box truck. The Closed boxtruck has an average drag coefficient, 20.1% lower than the open box. The flow visualization of the streamline that formed on the two trucks shows that the dominant turbulence and flow separation in the open box truck affects the drag coefficient results
KAJI TEORETIS DAN EKSPERIMENTAL DEFLEKSI PADA BAJA ST 37 DENGAN VARIASI BENTUK HAT SECTION
Full text linkThe purpose of this study was to determine the ratio of the deflection that occurs in the cross-sectional shape of the hat section and the percentage difference in the deflection results of the steel profile of the hat section both theoretically and experimentally. The material used in this study was ST 37 steel with variations in the shape of the hat section, namely 60°, 75° and 90°. The deflection test uses a pin support with 5 observation points and a centralized loading location. The results showed that the smallest deflection value occurred in the theoretical and experimental heat section profile of 90° shape, which was 10.10 mm (theoretical), 7.41 mm (experimental), then in the 75° shape 10.71 mm (theoretical), 8.15 mm (experimental), and for 60° shape 13.95 mm (theoretical), 9.69 mm (experimental). While the results of the maximum percentage difference occurs in the hat section shape of 60° with a value of 30.98%. Based on the results of this study, it can be explained that the increasing the value of the moment of inertia, the smaller the deflection value that occurs due to the increase in the stiffness value of the material
PENGARUH KECEPATAN SPINDLE TERHADAP TINGKAT KEKASARAN PERMUKAAN HASIL PENGERJAAN FRAIS
Full text linkThe roughness value on a metal surface is one of the considerations in determining the quality of a product. In some companies the level of surface roughness is very influential to produce good assembly products. The purpose of this study was to determine the effect of spindle speed on the surface roughness of the ST-70 material through the ANOVA test method and a surface roughness measurement tool (Surface Roughness Taster). For specimens in the form of a beam with dimensions of 100 mm in length, 20 mm in width and 25 mm in height. Using a spindle speed of 300 rpm, 400 rpm, and 500 rpm. Testing using the Ammitari AR-132 tool, this research was conducted at the Mechanical Technology Laboratory, Department of Mechanical Engineering, Faculty of Engineering, University of Tadulako. In the results of milling machining with spindle speeds of 300 rpm, 400 rpm, and 500 rpm with all variables outside the main variable constant, it shows that the results of the roughness test have the highest value in the milling process of 300 rpm with an average roughness of 6.063 µm, then in the milling process of 400 rpm the average roughness value is 5.352 µm, and the lowest roughness value is in the 500rpm milling process with a roughness value of 4.901 µm. Thus, the greater the value of the spindle speed used, the lower the surface roughness value of the milling process and the finer the surface of the specimen. The results of the ANOVA analysis used are Fcount <Ftable. This means that there is a difference between the average surface roughness values at spindle speeds of 300 rpm, 400 rpm and 500 rp
REKONTRUKSI BLADE TURBIN ANGIN DI DAERAH PEDESAAN JENEPONTO
Full text linkThe profile of the wind turbine blade used by salt farmers in Paccelang Village, Jeneponto Regency, South Sulewesi Province is rectangular shape, certain size, and made of wood. Although wood is easy to shape and can be found in the village, the blade size is too large which causes the blade to bend and break easily. In addition, the rectangular blade profile produces static characteristics that are not optimal. This article aims to review and recommend blade profile shapes with certain sizes according to the needs of salt farmers. The method used is numerical. The blade profiles in Paccelang Village, NACA 0010, and NACA 0020 blade profiles were formed to the appropriate size and assessed for their characteristics numerically. The results of the review recommend an applicable NACA 0010 blade profile
PENGARUH MEDIA AIR LINDI TPA GUNUNG KUPANG DAN AIR LINDI TPA CAHAYA KENCANA TERHADAP LAJU KOROSI DAN JENIS KOROSI PLAT BAJA SPCC-SD JIS G3141
Full text linkMedia studies to study the effect of different leachate media on corrosion rate and type of corrosion with variations of time 1 week and 2 weeks were removed, 2 weeks soaking and 1 week were removed, and 3 weeks soaking. The research data was obtained from the results of research with heavy methods and micro photographs. The successful variable is JIS G3141 spcc-sd steel plate, variable control is leachate from Gunung Kupang TPA and Cahaya Kencana TPA. From the results of the corrosion rate research obtained by leachate media taken from Mount Kupang landfill has the fastest corrosive properties the corrosion rate has an average of 0.718154 millimeters per year (mm / y) with soaking time of 2 weeks and 1 week removed. And the lowest corrosion rate at Cahaya Kencana TPA with an average corrosion rate of 0.131159 millimeters per year (mm / y) with a 3-week immersion time. The form of corrosion in the Gunung Kupang Landfill and Cahaya Kencana media is evenly corrosion