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Jurnal MEKANIKAL
Published by Universitas Tadulako
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Mechanical Engineering
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Articles 7 Documents
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Search results for , issue "Vol 5, No 1 (2014)" : 7 Documents clear
PENGARUH LINGKUNGAN KOMPOSIT SERAT SABUT KELAPA UNTUK APLIKASI BALING-BALING KINCIR ANGIN Bakri, Bakri; Chandrabakty, Sri; Alfriansyah, Alfriansyah; Tahir, Mohammad
Jurnal MEKANIKAL Vol 5, No 1 (2014)
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Abstract: Environmetal Effect of Tensile, Modulus and Shear Strength of Coir Fibre Composite. The aim of this research is to know the environmetal effect of tensile, modulus and shear strength of coir fibre composite. In this research, coir is used as reinforcement and matrix uses epoxy resin. Coir is soaked in water with 5% NaOH during 24 hours. Composite is moulded with 17 % fibre volume fraction and 83% matrix volume fraction. Then, the tensile specimen used ASTM D638-02 and shear specimen used ASTM D5379 standard. Universal Testing Machine is used to test of these spesimens. The specimens of tensile and shear include without and with treatment to environmental influence during 10, 20, and 30 days. The result shows that tensile strength, modulus and shear strength  of  specimen treatment during 10, 20, 30 days are not significantly decreased   from  specimen without treatment. This result can be used as recommadation for material of wind blade for the future.   Keywords: composites, coir fiber, shear strength, tensile strength
PENGARUH PREHEAT DAN POST WELDING HEAT TREATMENT TERHADAP SIFAT MEKANIK SAMBUNGAN LAS SMAW PADA BAJA AMUTIT K-460 Hestiawan, Henri; Surono, Ahmad Fauzan
Jurnal MEKANIKAL Vol 5, No 1 (2014)
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Abstract: The Effect of Preheat and Post Weld Heat Treatment on Mechanical Properties of SMAW Welding Steel Amutit K-460. Steel welding process causes changes in the mechanical properties such as the existence of residual stress and weld cracking. This can be avoided by giving preheat and post weld heat treatment (PWHT). This research aims to determine the effects preheat and PWHT treatment on mechanical properties of SMAW welded joints in amutit steel of K-460.The specimens used were plate of amutit steel of K-460 with dimentions of 200x20x10 mm. The preheat treatment was done with a tempering process at temperatures of 260 and 370 °C with a holding time is 30 minutes. PWHT treatment was done by tempering process at temperatures of 550 and 650 °C with a holding time is 30 minutes. The welding used electrodes wrapped, shielded metal arc welding (SMAW). Tensile test results showed that preheat + PWHT treatment, and PWHT treatment can increase the value of tensile stress and strain, the tensile stress and strain values ​​were highest in specimens treated 650°C PWHT, that is amounted to σ = 567.7 MPa and ε = 3.75% . Hardness test results showed that the treatment preheat and PWHT can increase the hardness value with the highest hardness values ​​of specimens PWHT treated at 650°C, that is in the HAZ of 43.3 HRC. From these results it can be concluded that the PWHT treatment give better results in improving the mechanical properties of SMAW welded joints in amutit steel of K-460.  Keywords : Amutit steel of K-460, las SMAW
PENGARUH MEDIA PENDINGIN MINYAK PELUMAS SAE 40 PADA PROSES QUENCHING DAN TEMPERING TERHADAP KETANGGUHAN BAJA KARBON RENDAH Bahtiar, Bahtiar; Iqbal, Muh.; Supramono, Supramono
Jurnal MEKANIKAL Vol 5, No 1 (2014)
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Abtstract: The Effect of Lubricating Oil SAE 40 As Cooling Media of Quencing and Tempering Processes on Strenghth of Low Carbon Steel. This study was conducted to determine the effect of  lubricating oil SAE 40 as cooling media of quenching and tempering process on the mechanical properties of low carbon steel. Quenching process is done for 7 min, 1 and 2 hours holding times at 925 ℃. Furthermore, tempering process consumes 14 minutes, 1 and and 2 hours holding times at 450 ℃. The raw material for the steel specimen is ST 42. Charpy impact test using a method based on ASTM standards E23-02. The results of impact testing the highest impact toughness values obtained for the heat treatment process then diquencing is 2033 KJ / m 2, at 925oC with a heating holding time 7 minutes, the lowest value is 523 KJ / m 2. The results of testing the highest impact toughness values obtained for the heat treatment process then diquencing and given treatment at a temperature of 450 ℃ tempering at 2607 KJ / m 2, at 925oC with a heating holding time 7 minutes and tempering holding time of 14 minutes, the lowest value is 776 KJ / m 2 , at 925oC with a heating holding time 2 hours minutes and tempering holding time is 2 hours. Keywords: queccing, tempering, cooling media, lucricating oil & strenghth
PENGARUH VARIASI MASSA REFRIGERAN R410A PADA SISI LOW STAGE TERHADAP KINERJA MESIN PENDINGIN CASCADE Muhammad Hasan Basri; Mustafa Mustafa; Khairil Anwar
Jurnal MEKANIKAL Vol 5, No 1 (2014)
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Abtract: The effect of R410 Refrigerant Mass Variation of The Low Stage Side on Performance of Cascade Engine Cooling. The aim of this research is to determine the effect of changes in the mass variation of refrigerant R410A in the Low - Stage Cooling on the coeficient of performance of the cascade refrigeration. The benefits of this research is to contribute valuable knowledge in the field of refrigeration, especially in the areas of health, agriculture and fisheries. The research method used is to perform testing or direct observation of the cascade refrigeration by replacing the stuffing or the mass of refrigerant in the low - stage of cascade system. Variation of refrigerant mass is 180, 190 and 200 gram. Any variations were observed mass of the pressure and temperature at a predetermined test points. The results showed that at the same time the rising in cooling capacity of the machine cascade with increasing refrigerant mass speed. With a mass of 180 gram showed a significant increase in weight compared to other masses, where a higher cooling capacity kW at 0.39 and coefficient of performance is 1.23.   Keywords :  Mesin refrigerasi, cascade, refrigeran R410A
KONFIGURASI SERPENTINE-PARALEL DAN PARALEL-SERPENTINE PADA PIPA FLUIDA PEMANAS AIR SURYA SISTEM THERMOSIPHON Mustofa, Mustofa; Hatib, Rustan
Jurnal MEKANIKAL Vol 5, No 1 (2014)
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Abstract: Configuration of Serpentine-Parallel and Parallel-Serpentine in Solar Hot Water Tube Thermosiphon System. The aim of this research is to compare the performance of two differences tube configuration in solar hot water collector thermosiphon system. Not only the tubes configuration are not the same, but also the collector materials, such as hot water reservoir and heat absorber are differences. For example, fiberglass and stainless steel reservoirs are compared in terms of long-lasting heat isolation. Likewise, copper tubes configuration between serpentine-parallel and parallel-serpentine are shown in association with mass flow rates and times consume to heat the water within the tubes. The test results show that parallel-serpentine configuration has higher performance (around 50%) than that of serpentine-parallel (approximately 35%). It is possibly because of fluid velocity within the tube configuration.   Keywords: serpentine-parallel, parallel-serpentine, solar hot water, thermosiphon
FOURRIER TRANSFORM INFRA-RED (FT-IR) SPECTROSCOPY DAN KEKUATAN TARIK SERAT KULIT BATANG MELINJO MENGGUNAKAN MODIFIKASI DISTRIBUSI WEIBULL Chandarabakty, Sri
Jurnal MEKANIKAL Vol 5, No 1 (2014)
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Abstract: Fourrier Transform Infra-Red (FT-IR) spectroscopy and Tensile Strength of Melinjo Leather Fiber Using Modified Weibull Distribution. This study aims to analyze the influence of surface treatment on the chemical properties of the fiber stem (bast fiber) “melinjo” (Gnetum gnemon) and its relation to the mechanical properties of the fiber. The research process begins with providing surface treatment on fiber rods gnetum gnemon, namely boiling the water for 3 hours of media and media NaOH 5% respectively for 2 and 3 hours. Then the fiber surface morphology observed using Scanning Electron Microscopy (SEM), further testing of FT-IR is useful to re-characterization of the chemical changes that occur in the fiber caused by the treatment given. The results of these observations are then compared with the value of bark fiber tensile strength gnetum gnemon analyzed using a modified Weibull distribution. CH at ~ 2900 cm-1 was seen in all types of fibers and the highest intensity seen in the media treatment of the fiber with water 3 hours. Group C = O (carbonyl) at ~ 1735 cm-1 is only seen in fibers with boiled treatment for 180 hours. C-OH group at ~ 1239 cm -1 peak decreases as the duration of treatment. Of physical and mechanical properties of the fiber, the fiber surface treatment on stem gnetum gnemon not only look at the surface topography but also on the distribution of fiber diameter and fiber strength were analyzed by two-parameter Weibull distribution model.   Keywords: Fourrier Transform Infra Red (FT-IR), melinjo leather fiber, Weibull Distribution
PENGARUH PENAMBAHAN SOLUTION PREHEATER TERHADAP LAJU PRODUKSI UAP REFRIGERAN PADA GENERATOR MESIN REFRIGERASI SIKLUS ABSORPSI Demak, Reyhan Kiay
Jurnal MEKANIKAL Vol 5, No 1 (2014)
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Abstract: The effect of Addictive Solution Preheater on Refrigerant Vapor Production Rate of Absorption Cycle on Refrigerant Generator Engine The purpose of this study was to determine the effect of solution preheater absorption cycle that utilizes two springs with different temperatures on the rate of production of the refrigerant vapor in the generator. In this research, testing by simulating the use of two springs with different temperature, high temperature generator is used to heat and temperature is used to heat a heat exchanger (preheater solution) that will heat up the rich solution before entering the generator. The test results showed an increase in the flow rate of refrigerant which is produced by generator with temperature hot water that goes into solution preheater, the temperature of the hot water entering the generator temperature variation of 80° C and hot water preheater from 55 till 70oC entry solution obtained an increase in refrigerant flow rate of 0.000381 kg/s solution without the use of a preheater and preheater with the use of solution increased to 0.000387 kg/s at temperatures up to 55oC maximum performance of 0.0005 kg/s temperature of 70oC.   Keywords:  Refrigeration machine, absorption cycle, H20-LiBr, solution preheater, the refrigerant vapor.

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