Authors:Aswan Munang First page: 155 Abstract: The objective of the study is to determine the mechanical strength of chicken feather and sawdust waste in making biocomposites. The use of natural fibers because they are cheap and environmentally friendly. Preparation of biocomocytes with several folume fractions. The volume fraction to be researched is 80%, 20%, 0%, 80%, 15%, 5%, 80%, 10%, 10%, 80%, 5%, 15%, 80%, 0%, and 20%. Biocomposite testing with ASTM E8 specimen standards for tensile testing with a universal testing machine. Impact testing with ASTM E23 specimen standards with an impact testing machine. From the test results, it can be seen that the volume fraction of 80%, 15%, 5%, has the highest tensile strength with 6,390 MPa. Tensile test at a volume fraction of 80%, 15%, 5%, with an impact strength of 0.731 joules. From the research results, it can be concluded that the same volume fraction as the tensile and impact test has a high mechanical strength. The use of the dominant fiber does not affect its mechanical strength. The combination of natural fibers and polymers used will affect its mechanical strength. PubDate: 2022-01-20 Issue No:Vol. 6, No. 3 (2022)
Authors:Aladin Eko Purkuncoro First page: 161 Abstract: Wire Electric Discharge Machine (EDM) is a non-conventional metal cutting machine. This machine is commonly used to form machine components that have complex shapes and require high precision. Not many conventional and non-conventional machines are capable of producing small module gears. The cutting groove occurs from the erosion of the electric spark by the electrode wire moving from the coil of wire and forming or cutting the workpiece. One of the machining parameters that determines the quality of the product on an EDM wire is Current. So this study aims to determine the deviation of the gear profile cutting groove and the roughness that occurs in the straight gear profile cutting groove from the results of the Wire EDM process. In this thesis research, the varied parameters are electric current. The current used is 6 A, 7 A, 8 A, 9 A 10 A. The results of this research show that the current 6 A has an average deviation value of 0.0228 mm. At current 7 A has an average deviation value of 0.0255 mm. At current 8 A has an average deviation value of 0.0275 mm. At current 9 A has an average deviation value of 0.0313 mm. And at a current of 10 A has an average deviation value of 0.0362 mm. At current 6 A has an average roughness value. At current 7 A has an average roughness value. At current 8 A has an average roughness value. At current 9 A has an average roughness value. And at current 10 A has an average roughness value. This is due to the greater use of an electric current at the electric voltage, which will cause the sparking to get bigger too, this causes the movement of the electron flow to hit the surface of the workpiece faster, resulting in an increase in temperature which results in erosion of the workpiece surface. , this will change the result of the cut which affects the size precision and roughness of the wire EDM. PubDate: 2022-01-19 Issue No:Vol. 6, No. 3 (2022)
Authors:Yuniarto Agus Winoko, Zulfikar Jabbaruddin Al Jihad Zulfikar, Umi Anis Ro'isatin First page: 167 Abstract: Abstract: From year to year fossil fuels start to run out due to the increasing marketing of fuel due to the increasing number of vehicles in Indonesia. It is proven by the increase in fuel prices in Indonesia, which means that the available oil is running low. To overcome the excessive use of fossil waste, researchers use alternative materials which are recycled from waste or commonly called bioethanol. The purpose of making a fuel mixture is that in addition to materials that are easily available, bioethanol does not damage the surrounding environment because it uses materials that do not contain harmful substances, which can be recycled such as fruit peels or plant waste. The study method used is experimental, using a Yamaha Force 115cc motorcycle. Data is obtained directly by observing the analysis of experimental results and then concluding in the form of graphs and tables. This test uses a dynamometer to determine the power and torque produced, while for testing the rate of fuel consumption using a measuring burette, then the calculation of fuel consumption is carried out. The results showed that there were differences in power, torque, Bmep and fuel consumption produced by variations in fuel. For maximum power produced on E15 fuel of 6.47 hp and a maximum torque of 5.16 Nm. For the lowest power produced on E20 fuel of 5.67 hp and the lowest torque of 4.39 Nm. The lowest fuel consumption was found in the use of E10 fuel of 0.000338 kg/hP while the highest fuel consumption was produced by E20 fuel of 0.0000406 kg/hP. For the highest Bmep on E15 fuel of 11.91 Psi and the lowest on E20 fuel of 11.39 Psi PubDate: 2022-01-26 Issue No:Vol. 6, No. 3 (2022)
Authors:Farhan Adi Farrasandi, Firmansyah Sasmita, Husaini Ardy First page: 175 Abstract: The heat exchanger is an intermediary for two or more fluids that flow both inside and outside of the heat exchanger to distribute heat. This process was aimed to increase efficiency levels in the process industry. One of the suitable materials for the tube is UNS C44500, also known as admiralty brass consists of 70Cu-30Zn, which has high thermal conductivity and good corrosion resistance. However, admiralty brass was susceptible to stress corrosion cracking (SCC) when faced with nitrate since the tube was also loaded by internal stress. Moreover, SCC was also exacerbated by dezincification. The C-ring test method examined the effect of nitrate compounds and dezincification on SCC in C44500 Tube components. Tensile stresses varied between 15, 45, and 85% of yield strength, which were immersed into nitrate solutions consisting of NaNO3 and Cu(NO3)2. Some specimens were washed using 20% HCl to bring up dezincification. The results obtained that SCC occurred at the highest Cu(NO3)2 concentration, identified by longitudinal crack and passivity breakdown. All of the dezincified specimens were found cracked due to SCC after immersion into 1 M Cu (NO3)2, while un-dezincified were failed when given tensile stress between 45% to 85% of maximum yield strength. PubDate: 2022-04-19 Issue No:Vol. 6, No. 3 (2022)
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