Impression creep behavior of as-cast Mg-xSi alloys (x = 0.5, 0.8, 1.2 wt.%) was studied under she... more Impression creep behavior of as-cast Mg-xSi alloys (x = 0.5, 0.8, 1.2 wt.%) was studied under shear modulus-normalized stress values ranging from 0.009 to 0.016 at temperatures between 398 and 491 K. The results show that creep properties of these alloys are improved with increasing Si content under all the applied loads and temperatures, and Mg-1.2Si alloy has minimum creep rate and thus maximum creep resistance. It is attributed to the higher volume fraction of Mg2Si, which can reduce grain boundary sliding during the creep test. Stress exponent of all the alloys is between 4.06 and 7.09 in the temperature range of 398 to 447 K. It is changed from the range of 3.96-4.89 to 8.62-12.62 under high-stress values at temperatures between 476 and 491 K. Creep activation energy under shear modulus-normalized stress of 0.010 and 0.012 is close to that of dislocation pipe diffusion of Mg. Under higher stress values at the high temperatures the creep activation energy is equal to that of Mg lattice diffusion. According to the obtained stress exponent values and creep activation energies, pipe-diffusion climb controlled dislocation creep is the dominant mechanism at temperatures between 398 and 447 K, which changes to power-law breakdown (PLB) under high-stress values at 476 and 491 K. K e y w o r d s : Mg-Si alloys, impression creep, creep mechanism, microstructure
Vibration occurs due to excitation both from within and from outside the system, but the effect o... more Vibration occurs due to excitation both from within and from outside the system, but the effect of vibration is very dependent on the excitation frequency and the elements of the vibration system itself. The purpose of this research is to find out the natural frequency value of the test specimens using accelerometer as a result of 2 selenoids with the same frequency as the fix-fix. The natural frequency was measurement of the cylinder beam rod with fix-fix pedestal. Four points of the test were given by using a double solenoid with the same frequency given on beam rod by varying the test point, then measured using 3 accelerometers and measured data then processed using data acquisition DT8837 through Quick DAQ program. The natural frequency of the beam cylinder rod can be detected by testing by using an excitation shaker or selenoids which in the beam cylinder rod is given disturbance by giving the excitation then recorded using accelerometer then processed using the data acquisitio...
Recently, it has been difficult to get the wood as a material to construct the traditional ships.... more Recently, it has been difficult to get the wood as a material to construct the traditional ships. Alternatively, the wood can be substituted by composite materials such as the composite of coco fiber. The coco fiber composites have potential to construct a fishing boat. In this research produced the composite plates and investigation of their value of tensile strength and flexural strength. The composite composition was used 70% polyester and 30% coco fiber. Production of the composite plates used Vacuum Assisted Resin Infusion (VARI) method by variation of the direction of fibers (random, continous and woven). Based on the research result that was produced the composite plates sizes of 400 x 400 x 8 mm and the value of tensile strengths of composite coco fiber for random fiber direction of 12.8572 N/mm2, continuous fiber direction of 15.4436 N/mm2 and woven direction of 12.1797 N/mm2. The value of flexural strengths for random fiber direction was 97.3220 N/mm2, continuous fiber dir...
The FTA is a method to identify the failure of system. Whilst, the DFMA is a method to determine ... more The FTA is a method to identify the failure of system. Whilst, the DFMA is a method to determine how to design of product, which is purposed to increases the quality of product and make easily the product assembly process. The rotary friction welding is one of type of friction welding, that principle is both of surfaces by friction which one end is fixed and then provides axial pressure to against another the rotating surface until both surface forge together. The Rotary friction welding machine in Production Technology Laboratory, Department of Mechanical Engineering, Universitas Riau has some shortcoming, as sequences the welding results are not optimal. Furthermore, this research aims to overcome the deficiency rotary friction welding machine in the Mechanical Engineering, Universitas Riau, then identified the problems using the FTA method and redesign one using the DFMA method. There were several steps to conduct testing of the rotary friction welding i.e. before redesign, after...
P enelitian ini bertujuan untuk mengetahui perubahan s ifat mekani k besi cor akibat pengaruh pen... more P enelitian ini bertujuan untuk mengetahui perubahan s ifat mekani k besi cor akibat pengaruh pengelasan . Pengelasan besi cor melalui proses Gas Metal Ar c Welding (GMAW) . Perubahan sifat mekanik diteliti melalui pengamatan struktur mikro dan beberapa pengujian merusak. Pengamatan struktur mikro dilakukan menggunakan pengujian metalografi . Sifat mekanik besi cor diamati melalui pengujian tarik aksial, bending tiga titik , kekerasan, dan impak. Dari hasil p engamatan struktur mikro diketahui bahwa besi cor uji merupakan jenis besi cor kelabu . Kekuatan tarik besi cor yang tidak dilas lebih tinggi dibandingkan besi cor yang dilas, perbedaan kekuatan tarik keduanya sekitar 49,2 MPa. Besi cor yang dilas bersifat lebih getas dibandingkan besi cor tidak dilas karena besi cor dilas mencapai regangan patah yang lebih kecil dibandingkan besi cor tidak dilas. Modulus elastisitas besi cor tidak dilas lebih tinggi dibandingkan besi cor dilas dimana perbedaan modulus elastistas sekitar 373,75...
Fracture that occurred in bar-plate friction welding joint on component, be it with a similar or ... more Fracture that occurred in bar-plate friction welding joint on component, be it with a similar or dissimilar materials, can be reviewed by destructive testing. One of the destructive test on weld joint by friction welding is the impact test. Pendulum of standart Charpy and Izod is not match to use for it. Therefore, in this study was made the design and set up pendulum of impact testing for it, using the finite element method software, by considering dynamic factors that may affect fracture such as, loading angle, loading point on the product bar-plate, the dimensions of pendulum, maximum stess thet occurs, and the mass variation of the pendulum. The Obtain summaries are as follows: (1) Results of the Pendulum tests, it was safe to use, it was qualyfied for pendulum impact testing, and plastic deformation was not occurs on entire pendulum. (2) Based on tests result, loading point (x) at 10mm, affected fracture between bar and plate in HAZ section, while loading point at 40 mm until 1...
Rokan river is one of the the four biggest river in Province of Riau which contains abundant of s... more Rokan river is one of the the four biggest river in Province of Riau which contains abundant of sand. The utilization of the sand has not reached an optimum level due to the limits of information for optimal profitability with it is not documented and therefore it is used only for building’s materials. However some literatures indicate that the sand is suitable for foundry use based on the physical characteristics. In this paper, a laboratory investigations of four critical foundry properties; clay content, Grain Finest Number (GFN), moisture content, and permeability of the sand is conducted. The outcome of this research to determine the potency of Rokan river’s sand as molding sand in Sand Casting. The result shows all the samples are potential as the molding sand through certain treatments. The most potential river sand is downstream river’s sand with the following characteriscs: clay content 1.29%, GFN 27.25, moisture content 1.35% and gas permeability 10.9564 cm/min while the u...
Friction Welding is one of the well known press welding methods, where the method is joining two ... more Friction Welding is one of the well known press welding methods, where the method is joining two pieces of metal materials. By in this method the heat resulted from the change in mechanical energy into thermal energy in the field of interface the workpiece due to friction during motion plays under pressure/friction. Rotary friction welding is made from bar-plate specimens and its products tested by tensile test but not optimal because the weld test objects attached again by adding one bar on the other side, so that acquired way of knowing the characteristics of friction welding the connection using the impact test, so it required the design and manufacture of tools the impact test that aims to get the construction design and the impact tester of friction welding structure of bar-plate. Construction design includes chassis, axle, fixture, and a disc Binder then simulated using ANSYS to view voltage that occurs in the design does exceed the allowed voltage. The component designer is s...
Palm slag as waste burning of palm shells and bunches for boiler fuel is available in abundance. ... more Palm slag as waste burning of palm shells and bunches for boiler fuel is available in abundance. Availability of abundant is potential to be developed as a filler of brake composite. The using of palm slag as filler composite non-asbestos brake pads have been studied and potential to be used as a substitute for asbestos brake pads motorcycle. The purpose of this study was to determine the effect of variations in the initial compacting pressure and sintering temperature on the compressive strength and the wear rate of the composite. In this study the manufacture of composite brake using materials with a composition of 40% palm slag, 20% steel powder, 20% phenolic resin, 10% alumina, and 10% graphite. Manufacture of composites using powder metallurgy techniques by varying the compaction pressure at 254, 508, and 762 MPa, and sintering temperatures of 150, 160, and 170oC. Increasing compaction pressure and sintering temperature does not always affect the compressive strength and the we...
This paper discusses an experimental investigation of tensile strength and impact properties of p... more This paper discusses an experimental investigation of tensile strength and impact properties of polymeric foams-OPEFB fiber sandwich panels composite with various directions of palm empty fruit bunches fiber, vacuum pressure, and foam thickness. In this study, the manufacture of specimens with different fiber directions will then be tested and analyzed for each direction of fiber. The results of the analysis of composite specimens in the study were evaluated and compared with each other. The purpose of this study was to obtain impact energy and tensile strength of composite plates. In the manufacture of sandwich panel specimens carried out by varying the pump pressure, foam thickness, and the direction of the preparation of the fiber and carried out by the vacuum method. From the test results, it was found that the highest tensile strength was composite specimens with vertical fiber direction is specimens with three vertical panels of fiber direction, vacuum pressure 6 cm Hg, and foam thickness is 1.5 mm with tensile strength is 22.5 N/mm 2 , while the highest impact energy is the specimen with vertical fiber direction is the specimen with the fiber direction of the three vertical panels, the vacuum pressure is 6 cm Hg, and foam thickness of 1.5 mm with an impact price of 0.16 J/mm 2. From this study it can be concluded that the fiber direction is 53% higher than the direction of the combined fibers vertically, horizontally, and vertically in absorbing impact loads, also 83% higher than the vertical, 45⁰, and horizontal combined fibers in absorbing impact loads It also has a tensile strength of 10% higher than the vertical, horizontal and vertical combined fiber direction, also has a tensile strength of 15% higher than the vertical, 45⁰ and horizontal combined fiber direction.
Journal of ocean, mechanical and aerospace - science and engineering, Mar 30, 2022
This paper presents an experimental study of mass percentage and pretreatment effect of oil palm ... more This paper presents an experimental study of mass percentage and pretreatment effect of oil palm trunk (OPT), and peat charcoal on energy parameters of biomass pellet. The density, calorific value, moisture and ash content of OPT biomass pellet has been developed and the experimental conditions in obtaining the energy parameters of OPT biomass pellet are discussed. The physical pretreatment was carried out by finely chopping OPT, peat charcoal, and adhesive and mixed in a predetermined composition. The manufacturing process of OPT biomass pellet was performed, the mass percentage of OPT and peat charcoal were varied. Type of test was performed on biomass pellet include density, calorific value, moisture and ash content. The influences of various parameters on the characteristics of biomass pellet were considered. The increase of mass percentage and pretreatment of peat charcoal has an effect on increasing the density, decreasing the calorific value of OPT biomass pellet, increasing the moisture content, and increasing the ash content of OPT biomass pellet. The mixture of coconut shell charcoal decreasing the density, increasing the calorific value, decreasing the moisture content, and decreasing the ash content of OPT biomass pellet. Biomass pellets from a mixture of OPT and coconut shell charcoal has a calorific value of 6649 cal/g, where the density was 1.15 g/cm 3 , the moisture content of 5.6%, and the ash content of 8.9%.
Journal of Ocean, Mechanical and Aerospace -science and engineering-, Sep 30, 2017
The good workshop management must also be supported by a properly administration, in order to rec... more The good workshop management must also be supported by a properly administration, in order to record all the resources that become workshop assets. Moreover, the motorcycle workshop also conducts spare parts sales to complete the replacement needs of broken vehicle spare parts. This study aims to analyze and design a workshop information system for Small and Medium Enterprises (SMEs) engaged in the field of repairing of motorcycle. Generally, the SMEs scale of motorcycle workshops in this research still uses a simple management system and manually in presenting the data required by the workshop. This it make difficult and inconvenient for the owner of a SMEs scale of motorcycle workshop. Sequence, it is necessary to optimalize the management system from the simpler manual system to be computerized. Stages of the method in this study: (1) survey of general workshop management SMEs scale, (2) do analysis of data obtained during the survey and provides input for workshop management based on 5S method, (3) to design and create information systems and databases using PHP (Hypertext Preprocessor) as the programming language and MySQL as the database. The approach of the 5S (Sort, Straighten, Shine, Standardize, Sustain) and creating an information system can manage equipments and properly administration in SMEs scale of motorcycle workshops. Therefore, they can help to optimize streamline the services and administration activity of SMEs scale of motorcycle workshops.
Journal of ocean, mechanical and aerospace - science and engineering, Nov 30, 2019
Dial indicator is a comparison device usually used in industrial activities, especially in produc... more Dial indicator is a comparison device usually used in industrial activities, especially in production. To make measurements at this time must be supported by technology that can facilitate operators when using it and when analyzing measurement results. Involving the programmed and microcontroller are a solution to developing in roundness measurement, and then the results can be more accurate or thorough between the readable values read from the measuring instrument with the actual value of varying the amount of data. Roundness application is a program that can input measurement data automatically and can do calculations directly. Then, it can display a reference circle, a table that calculates the values of X, Y, R, X', Y', R', Roundness Deviation, Run out Concentricity or a shift in the center point and also the center point shift or Theta. In measuring roundness, the test object is used the Standard Mandrel which has been certified by PT. Global Quality Indonesia, by determining three points or positions, namely in the first position the amount of data is 180, in the second position the amount of data is 90 and in the third position the amount of data is 60 with a rotating speed of 15 mm/s. The results of the reference circle can be seen in each calculation in each position, in the second position the roundness deviation values are approaching of the Mandrel.
Light gauge steel is the latest innovation in overcoming material problems in the use of roof con... more Light gauge steel is the latest innovation in overcoming material problems in the use of roof construction,especially the roof of the house. Generally, the construction of the roof of the house was made of wood, butbecause of the scarcity of wood made there should be a diversion in the use of materials. The use of light gaugesteel as a roof construction of the house has not been fully accepted by all of societies in general, due toconcerns in its strength. So this thesis discusses about the strength of the material and search for a better profilewithout any reduction of the existing structural material in the market. The profile design is the development ofan existing profile design or commercial profile. Testing of the comparison of new profile design results withcommercial profiles is done by simulation of Autodesk Inventor 2010. Simulation results are in the form ofcomparison of numbers. The result of the design number are better when compared from the commercialprofile then the ...
This paper discusses about an experimental investigation of tensile strength and impact propertie... more This paper discusses about an experimental investigation of tensile strength and impact properties of polymeric foams-OPEFB fiber sandwich panels composite with various directions of palm empty fruit bunches fiber, vacuum pressure, and foam thickness. In this study, the manufacture of specimens with different fiber directions will then be tested and analyzed for each direction of fiber. The results of the analysis of composite specimens in the study were evaluated and compared with each other. The purpose of this study was to obtain impact energy and tensile strength of composite plates. In the manufacture of sandwich panel specimens carried out by varying the pump pressure, foam thickness, and the direction of the preparation of the fiber and carried out by the vacuum method. From the test results, it was found that the highest tensile strength was composite specimens with vertical fiber direction is specimens with three vertical panels of fiber direction, vacuum pressure 6 cm Hg, ...
Impression creep behavior of as-cast Mg-xSi alloys (x = 0.5, 0.8, 1.2 wt.%) was studied under she... more Impression creep behavior of as-cast Mg-xSi alloys (x = 0.5, 0.8, 1.2 wt.%) was studied under shear modulus-normalized stress values ranging from 0.009 to 0.016 at temperatures between 398 and 491 K. The results show that creep properties of these alloys are improved with increasing Si content under all the applied loads and temperatures, and Mg-1.2Si alloy has minimum creep rate and thus maximum creep resistance. It is attributed to the higher volume fraction of Mg2Si, which can reduce grain boundary sliding during the creep test. Stress exponent of all the alloys is between 4.06 and 7.09 in the temperature range of 398 to 447 K. It is changed from the range of 3.96-4.89 to 8.62-12.62 under high-stress values at temperatures between 476 and 491 K. Creep activation energy under shear modulus-normalized stress of 0.010 and 0.012 is close to that of dislocation pipe diffusion of Mg. Under higher stress values at the high temperatures the creep activation energy is equal to that of Mg lattice diffusion. According to the obtained stress exponent values and creep activation energies, pipe-diffusion climb controlled dislocation creep is the dominant mechanism at temperatures between 398 and 447 K, which changes to power-law breakdown (PLB) under high-stress values at 476 and 491 K. K e y w o r d s : Mg-Si alloys, impression creep, creep mechanism, microstructure
Vibration occurs due to excitation both from within and from outside the system, but the effect o... more Vibration occurs due to excitation both from within and from outside the system, but the effect of vibration is very dependent on the excitation frequency and the elements of the vibration system itself. The purpose of this research is to find out the natural frequency value of the test specimens using accelerometer as a result of 2 selenoids with the same frequency as the fix-fix. The natural frequency was measurement of the cylinder beam rod with fix-fix pedestal. Four points of the test were given by using a double solenoid with the same frequency given on beam rod by varying the test point, then measured using 3 accelerometers and measured data then processed using data acquisition DT8837 through Quick DAQ program. The natural frequency of the beam cylinder rod can be detected by testing by using an excitation shaker or selenoids which in the beam cylinder rod is given disturbance by giving the excitation then recorded using accelerometer then processed using the data acquisitio...
Recently, it has been difficult to get the wood as a material to construct the traditional ships.... more Recently, it has been difficult to get the wood as a material to construct the traditional ships. Alternatively, the wood can be substituted by composite materials such as the composite of coco fiber. The coco fiber composites have potential to construct a fishing boat. In this research produced the composite plates and investigation of their value of tensile strength and flexural strength. The composite composition was used 70% polyester and 30% coco fiber. Production of the composite plates used Vacuum Assisted Resin Infusion (VARI) method by variation of the direction of fibers (random, continous and woven). Based on the research result that was produced the composite plates sizes of 400 x 400 x 8 mm and the value of tensile strengths of composite coco fiber for random fiber direction of 12.8572 N/mm2, continuous fiber direction of 15.4436 N/mm2 and woven direction of 12.1797 N/mm2. The value of flexural strengths for random fiber direction was 97.3220 N/mm2, continuous fiber dir...
The FTA is a method to identify the failure of system. Whilst, the DFMA is a method to determine ... more The FTA is a method to identify the failure of system. Whilst, the DFMA is a method to determine how to design of product, which is purposed to increases the quality of product and make easily the product assembly process. The rotary friction welding is one of type of friction welding, that principle is both of surfaces by friction which one end is fixed and then provides axial pressure to against another the rotating surface until both surface forge together. The Rotary friction welding machine in Production Technology Laboratory, Department of Mechanical Engineering, Universitas Riau has some shortcoming, as sequences the welding results are not optimal. Furthermore, this research aims to overcome the deficiency rotary friction welding machine in the Mechanical Engineering, Universitas Riau, then identified the problems using the FTA method and redesign one using the DFMA method. There were several steps to conduct testing of the rotary friction welding i.e. before redesign, after...
P enelitian ini bertujuan untuk mengetahui perubahan s ifat mekani k besi cor akibat pengaruh pen... more P enelitian ini bertujuan untuk mengetahui perubahan s ifat mekani k besi cor akibat pengaruh pengelasan . Pengelasan besi cor melalui proses Gas Metal Ar c Welding (GMAW) . Perubahan sifat mekanik diteliti melalui pengamatan struktur mikro dan beberapa pengujian merusak. Pengamatan struktur mikro dilakukan menggunakan pengujian metalografi . Sifat mekanik besi cor diamati melalui pengujian tarik aksial, bending tiga titik , kekerasan, dan impak. Dari hasil p engamatan struktur mikro diketahui bahwa besi cor uji merupakan jenis besi cor kelabu . Kekuatan tarik besi cor yang tidak dilas lebih tinggi dibandingkan besi cor yang dilas, perbedaan kekuatan tarik keduanya sekitar 49,2 MPa. Besi cor yang dilas bersifat lebih getas dibandingkan besi cor tidak dilas karena besi cor dilas mencapai regangan patah yang lebih kecil dibandingkan besi cor tidak dilas. Modulus elastisitas besi cor tidak dilas lebih tinggi dibandingkan besi cor dilas dimana perbedaan modulus elastistas sekitar 373,75...
Fracture that occurred in bar-plate friction welding joint on component, be it with a similar or ... more Fracture that occurred in bar-plate friction welding joint on component, be it with a similar or dissimilar materials, can be reviewed by destructive testing. One of the destructive test on weld joint by friction welding is the impact test. Pendulum of standart Charpy and Izod is not match to use for it. Therefore, in this study was made the design and set up pendulum of impact testing for it, using the finite element method software, by considering dynamic factors that may affect fracture such as, loading angle, loading point on the product bar-plate, the dimensions of pendulum, maximum stess thet occurs, and the mass variation of the pendulum. The Obtain summaries are as follows: (1) Results of the Pendulum tests, it was safe to use, it was qualyfied for pendulum impact testing, and plastic deformation was not occurs on entire pendulum. (2) Based on tests result, loading point (x) at 10mm, affected fracture between bar and plate in HAZ section, while loading point at 40 mm until 1...
Rokan river is one of the the four biggest river in Province of Riau which contains abundant of s... more Rokan river is one of the the four biggest river in Province of Riau which contains abundant of sand. The utilization of the sand has not reached an optimum level due to the limits of information for optimal profitability with it is not documented and therefore it is used only for building’s materials. However some literatures indicate that the sand is suitable for foundry use based on the physical characteristics. In this paper, a laboratory investigations of four critical foundry properties; clay content, Grain Finest Number (GFN), moisture content, and permeability of the sand is conducted. The outcome of this research to determine the potency of Rokan river’s sand as molding sand in Sand Casting. The result shows all the samples are potential as the molding sand through certain treatments. The most potential river sand is downstream river’s sand with the following characteriscs: clay content 1.29%, GFN 27.25, moisture content 1.35% and gas permeability 10.9564 cm/min while the u...
Friction Welding is one of the well known press welding methods, where the method is joining two ... more Friction Welding is one of the well known press welding methods, where the method is joining two pieces of metal materials. By in this method the heat resulted from the change in mechanical energy into thermal energy in the field of interface the workpiece due to friction during motion plays under pressure/friction. Rotary friction welding is made from bar-plate specimens and its products tested by tensile test but not optimal because the weld test objects attached again by adding one bar on the other side, so that acquired way of knowing the characteristics of friction welding the connection using the impact test, so it required the design and manufacture of tools the impact test that aims to get the construction design and the impact tester of friction welding structure of bar-plate. Construction design includes chassis, axle, fixture, and a disc Binder then simulated using ANSYS to view voltage that occurs in the design does exceed the allowed voltage. The component designer is s...
Palm slag as waste burning of palm shells and bunches for boiler fuel is available in abundance. ... more Palm slag as waste burning of palm shells and bunches for boiler fuel is available in abundance. Availability of abundant is potential to be developed as a filler of brake composite. The using of palm slag as filler composite non-asbestos brake pads have been studied and potential to be used as a substitute for asbestos brake pads motorcycle. The purpose of this study was to determine the effect of variations in the initial compacting pressure and sintering temperature on the compressive strength and the wear rate of the composite. In this study the manufacture of composite brake using materials with a composition of 40% palm slag, 20% steel powder, 20% phenolic resin, 10% alumina, and 10% graphite. Manufacture of composites using powder metallurgy techniques by varying the compaction pressure at 254, 508, and 762 MPa, and sintering temperatures of 150, 160, and 170oC. Increasing compaction pressure and sintering temperature does not always affect the compressive strength and the we...
This paper discusses an experimental investigation of tensile strength and impact properties of p... more This paper discusses an experimental investigation of tensile strength and impact properties of polymeric foams-OPEFB fiber sandwich panels composite with various directions of palm empty fruit bunches fiber, vacuum pressure, and foam thickness. In this study, the manufacture of specimens with different fiber directions will then be tested and analyzed for each direction of fiber. The results of the analysis of composite specimens in the study were evaluated and compared with each other. The purpose of this study was to obtain impact energy and tensile strength of composite plates. In the manufacture of sandwich panel specimens carried out by varying the pump pressure, foam thickness, and the direction of the preparation of the fiber and carried out by the vacuum method. From the test results, it was found that the highest tensile strength was composite specimens with vertical fiber direction is specimens with three vertical panels of fiber direction, vacuum pressure 6 cm Hg, and foam thickness is 1.5 mm with tensile strength is 22.5 N/mm 2 , while the highest impact energy is the specimen with vertical fiber direction is the specimen with the fiber direction of the three vertical panels, the vacuum pressure is 6 cm Hg, and foam thickness of 1.5 mm with an impact price of 0.16 J/mm 2. From this study it can be concluded that the fiber direction is 53% higher than the direction of the combined fibers vertically, horizontally, and vertically in absorbing impact loads, also 83% higher than the vertical, 45⁰, and horizontal combined fibers in absorbing impact loads It also has a tensile strength of 10% higher than the vertical, horizontal and vertical combined fiber direction, also has a tensile strength of 15% higher than the vertical, 45⁰ and horizontal combined fiber direction.
Journal of ocean, mechanical and aerospace - science and engineering, Mar 30, 2022
This paper presents an experimental study of mass percentage and pretreatment effect of oil palm ... more This paper presents an experimental study of mass percentage and pretreatment effect of oil palm trunk (OPT), and peat charcoal on energy parameters of biomass pellet. The density, calorific value, moisture and ash content of OPT biomass pellet has been developed and the experimental conditions in obtaining the energy parameters of OPT biomass pellet are discussed. The physical pretreatment was carried out by finely chopping OPT, peat charcoal, and adhesive and mixed in a predetermined composition. The manufacturing process of OPT biomass pellet was performed, the mass percentage of OPT and peat charcoal were varied. Type of test was performed on biomass pellet include density, calorific value, moisture and ash content. The influences of various parameters on the characteristics of biomass pellet were considered. The increase of mass percentage and pretreatment of peat charcoal has an effect on increasing the density, decreasing the calorific value of OPT biomass pellet, increasing the moisture content, and increasing the ash content of OPT biomass pellet. The mixture of coconut shell charcoal decreasing the density, increasing the calorific value, decreasing the moisture content, and decreasing the ash content of OPT biomass pellet. Biomass pellets from a mixture of OPT and coconut shell charcoal has a calorific value of 6649 cal/g, where the density was 1.15 g/cm 3 , the moisture content of 5.6%, and the ash content of 8.9%.
Journal of Ocean, Mechanical and Aerospace -science and engineering-, Sep 30, 2017
The good workshop management must also be supported by a properly administration, in order to rec... more The good workshop management must also be supported by a properly administration, in order to record all the resources that become workshop assets. Moreover, the motorcycle workshop also conducts spare parts sales to complete the replacement needs of broken vehicle spare parts. This study aims to analyze and design a workshop information system for Small and Medium Enterprises (SMEs) engaged in the field of repairing of motorcycle. Generally, the SMEs scale of motorcycle workshops in this research still uses a simple management system and manually in presenting the data required by the workshop. This it make difficult and inconvenient for the owner of a SMEs scale of motorcycle workshop. Sequence, it is necessary to optimalize the management system from the simpler manual system to be computerized. Stages of the method in this study: (1) survey of general workshop management SMEs scale, (2) do analysis of data obtained during the survey and provides input for workshop management based on 5S method, (3) to design and create information systems and databases using PHP (Hypertext Preprocessor) as the programming language and MySQL as the database. The approach of the 5S (Sort, Straighten, Shine, Standardize, Sustain) and creating an information system can manage equipments and properly administration in SMEs scale of motorcycle workshops. Therefore, they can help to optimize streamline the services and administration activity of SMEs scale of motorcycle workshops.
Journal of ocean, mechanical and aerospace - science and engineering, Nov 30, 2019
Dial indicator is a comparison device usually used in industrial activities, especially in produc... more Dial indicator is a comparison device usually used in industrial activities, especially in production. To make measurements at this time must be supported by technology that can facilitate operators when using it and when analyzing measurement results. Involving the programmed and microcontroller are a solution to developing in roundness measurement, and then the results can be more accurate or thorough between the readable values read from the measuring instrument with the actual value of varying the amount of data. Roundness application is a program that can input measurement data automatically and can do calculations directly. Then, it can display a reference circle, a table that calculates the values of X, Y, R, X', Y', R', Roundness Deviation, Run out Concentricity or a shift in the center point and also the center point shift or Theta. In measuring roundness, the test object is used the Standard Mandrel which has been certified by PT. Global Quality Indonesia, by determining three points or positions, namely in the first position the amount of data is 180, in the second position the amount of data is 90 and in the third position the amount of data is 60 with a rotating speed of 15 mm/s. The results of the reference circle can be seen in each calculation in each position, in the second position the roundness deviation values are approaching of the Mandrel.
Light gauge steel is the latest innovation in overcoming material problems in the use of roof con... more Light gauge steel is the latest innovation in overcoming material problems in the use of roof construction,especially the roof of the house. Generally, the construction of the roof of the house was made of wood, butbecause of the scarcity of wood made there should be a diversion in the use of materials. The use of light gaugesteel as a roof construction of the house has not been fully accepted by all of societies in general, due toconcerns in its strength. So this thesis discusses about the strength of the material and search for a better profilewithout any reduction of the existing structural material in the market. The profile design is the development ofan existing profile design or commercial profile. Testing of the comparison of new profile design results withcommercial profiles is done by simulation of Autodesk Inventor 2010. Simulation results are in the form ofcomparison of numbers. The result of the design number are better when compared from the commercialprofile then the ...
This paper discusses about an experimental investigation of tensile strength and impact propertie... more This paper discusses about an experimental investigation of tensile strength and impact properties of polymeric foams-OPEFB fiber sandwich panels composite with various directions of palm empty fruit bunches fiber, vacuum pressure, and foam thickness. In this study, the manufacture of specimens with different fiber directions will then be tested and analyzed for each direction of fiber. The results of the analysis of composite specimens in the study were evaluated and compared with each other. The purpose of this study was to obtain impact energy and tensile strength of composite plates. In the manufacture of sandwich panel specimens carried out by varying the pump pressure, foam thickness, and the direction of the preparation of the fiber and carried out by the vacuum method. From the test results, it was found that the highest tensile strength was composite specimens with vertical fiber direction is specimens with three vertical panels of fiber direction, vacuum pressure 6 cm Hg, ...
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