Jurnal MEKANIKAL
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OPTIMASI SIFAT MEKANIS KEKUATAN TARIK BAJA ST 50 DENGAN PERLAKUAN GAS CARBURIZING VARIASI HOLDING TIME UNTUK PENINGKATAN MUTU BAJA STANDAR UJI ASTM A370
Get PDFST 50 steel as a common engineering material, it can be optimized using gas carburizing treatment in Fluidized Bed Furnaces. Gas as carburizing media in the fluidied bed with vaned by holding time variation such as 1 hour, 2 hours, 3 hours, 4 hours, and 5 hours. The holding time variation is to be intern of mechanical properties of the steel. Optimized value of mechanical properties ST 50 was actived in 3 hours of the treatment, it found average of tensile strength 651,7 MPa. The results above were based on A370 ASTM standar. From SEM (Scanning Electron Microscope), fracture model also showed from SEM that the steel has hard and brittle fracture. It can be concluded that optimized steel using gas carburizing treatment shows significant improve of mechanical properties from steels
KARAKTERISTIK TERMAL BRIKET ARANG SERBUK GERGAJI KAYU MERANTI
Get PDFThe aim of this research is to find out of thermal characteristic of meranti wood dust briquette, that consist of High heating value (HHV), contents of Moisture (M),Ash (A),Volatile Matters (VM),Fixed Carbon (FC), combustion efficiency and emission gas product of combustions are ;carbon monoxides CO and Carbon dioxides CO2. This investigation is used experiment method to make char briquette of meranti wood dust and mixed with 10% of boil water, 5% of clay, 7% of tapioca and pressing force 2.5 Mpa. The result of investigations are; HHV 5731.10 kcal/kg. Ash 3.97%, Mouisture 1.72%, Volatile Matters 29.19%, Fixed Carbon 65.90 %, combustions efficiency 70.76% and emission gas product of combustions are CO 0.33% and CO2 1.36%, both of them are safe of human being according to WHO Standard
JENIS MATERIAL PAHAT POTONG DAN RUN OUT TERHADAP KEKASARAN PERMUKAAN BENDA KERJA SILINDER PADA PROSES BUBUT
Get PDFMachining process is part of the production process where cutting process of work piece is done by using machine tools. Machine tools are used in the machining process includes lathe machines, milling machines, shaping machines, drilling machines and other machine tools. For a cylindrical work piece the cutting process can be done by using a lathe. Lathe process can make cylindrical objects, holes, taper and other forms. In the cutting process of work piece with a lathe machine are required high accuracy and precision especially for work piece such as shafts , pistons and objects that serve as a connecting other components. Work piece with high accuracy and precision can be obtained by use the reliable of machine tools, cutting condition, the selection of machining elements and material of cutting tools; operators have a skill for operation of machine tools. Cutting conditions such as mounting work pieces that are not center (run out) or overhang of work piece with strong pressure between head stock and tail stock can be resulting deflection. Run out and deflection happened can be cause the cutting force is not uniform. Therefore cause damage to the work piece and machine. Damage on the work piece can be seen from the quality of the cutting (surface roughness) and for machine on the case of chatter or vibration arising from the cutting force. In this paper we will focus to determine the effect of cutting tools material and run out of material on the surface roughness where as machining element used is the depth of cut and feeding. Work piece used is made of medium carbon steel
KERUGIAN-KERUGIAN PADA PIPA LURUS DENGAN VARIASI DEBIT ALIRAN
Get PDFFluid flow a pipe (internal flow) always happens losses caused by friction between the wall because of the influence of the fluid’s viscosity. High coefficient of friction affect them directly to a substantial reduction of the pressure and eventually to the amount of energy needed to drain the fluid. Application of this research is on the installation of pipeline taps, pertamina’s crude oli supply, installation of sump drainage pipe in the mining regions and many other applications. In this study, will be varied so that the flow rate will be obtained by varying Reynolds number, and will be searched the relationship betwenReynolds and major losses, the speed of the mayor losses that occur with such a relationship will be obtained as a study in fluid mechanics studies From this study indicate that the relationship between Reynolds number the friction factor is which means the greater the speed of the major losses will be greater. The lowest value of friction factor at full valve opening with Re= 1,91 x 105 to the value f = 1,513 x 10-2 and the highest value of friction factor occurs at the valve opening quarter with Re = 4,30 x 104 to the value f= 2,195 x 10-2. The highest major with the value of ∆h= 196,67 mm at a speed v= 19,572 m/s (at full valve opening), the lowest rate of major losses on the value of ∆h= 0 (small) at the speed of v = 2,453 m/s
KEKUATAN BENDING KOMPOSIT CLAY DIPERKUAT DENGAN ALUMINA UNTUK APLIKASI FIRE BRICK
Get PDFThis study aims to utilize clay obtained from the Central Sulawesi which has 27.445 % Al2O3 composition ; SiO2 50.251 %, 9.331 % Fe2O3 ; Na2O 4.041 %, 3.263 % CaO ; K2O 3.733 %, MgO 2.40 %, 0.168 % TiO2 as a matrix clay -reinforced alumina composite . Alumina powder is a ceramic material that is hard and resistant to high temperatures . Alumina powder as much as 0, 15, 30, 45 , and 60 % weight fraction of powder mixed with clay that has been calcined at a temperature of 800 ° C for 30 minutes ( size ≤ 74 lm ) . Each mixture was stirred using a mixer brands Stuart Scientific for 2 hours . A mixture of clay and alumina powders were uniaxial dikompaksi with 50 MPa pressure and then sintered at atmospheric environment with a temperature of 1000 ° C. 1100 ° C , 1200 ° C and 1300 ° C. Testing is done is the density and bending strength . The test results showed that with increasing weight fraction of alumina and sintering temperature will increase the relative density and bending strength , but if the increase is not accompanied by the weight fraction of alumina sintering temperature rise will decrease the value of the relative density and bending strength . Value of the relative density and bending strength of the composite obtained at the highest weight fraction of 60 % alumina and sintering temperature of 1300 ° C , respectively, 72.28 % and 62.14 MP
VARIASI ARUS TERHADAP KEKUATAN TARIK DAN BENDING PADA HASIL PENGELASAN SM490
Get PDFThis study aimed to determine the effect of variations in welding current on tensile strength and bending the steel SM490, with the variation of welding current 140 A, 150 A, and 160 A. Electrodes used were E 7018, with the hem V angle 70o, SMAW welding methods. Tests performed are tensile and bending tests. The research was conducted at the department of materials science laboratory machine tadulako university engineering faculty. Ultimate tensile strength of welded joints occur at 160 A current variation with an average value of 626.35 MPa tensile stress and the lowest in the group of 140 A current variation of 468.85 MPa, and for an extension or tensile strain is highest value at 160 A by 14.33% and the lowest at 140 A current variation of 9.25%. To the elasticity of the welding process with a variation of the current value of 140 A bona fide high of 3260.03 MPa and the lowest was at 160 A current variation in the amount of 3040.64 MPa. Highest bending stress values contained in the variation of welding current 160 A of 45.069 MPa and the lowest was at 140 A current variation of 40.635 Mpa. Deflection value that occurs in the bending test is highest value at 160 A current variation of 34.333 mm and the lowest was at 140 A current variation of 32.77 mm
TINJAUAN APLIKASI SERAT SABUT KELAPA SEBAGAI PENGUAT MATERIAL KOMPOSIT
Get PDFNatural fibres as reiforcement of composite have been concerning in the last decade. These have changed in use convestional fibre like glass fibre and carbon fibre related to environmental effect. One of natural fibres can potensially change conventional fibre is coir fibre. This fibre is abundant in tropical areas such as India, Brazil and Indonesia. In this paper, an overview of aplication of coir fibre as reinforced composite in some uses was described
ANALISIS VARIASI PANJANG SERAT TERHADAP KUAT TARIK DAN LENTUR PADA KOMPOSIT YANG DIPERKUAT SERAT Agave angustifolia Haw
Get PDFNatural fibre composites have been developed for some applications. One of potential natural fibre for composite is angustifolia Haw Agave fibre. In this research, the tensile strength and flexural strength of agave fibre composite with variations of fibre length were determined. Fibre agave (treated and untreated) with 1 cm, 3 cm and 5 cm length was used as reinforced composite. The results showed that the maximum tensile strength of agave fibre composite with untreated fibre occurs in 5 cm length, meanwhile with treated fibres the tensile strength tends to similar for each fibre length; and agave fibre with 5 cm length as reinforced composite has higher flexural strength than other fibre lengths for treated and untreated fibres
STUDI KAITAN PARAMETER PENGEREMAN DENGAN BEBAN DINAMIS PADA KENDARAAN
Get PDFThis research aims to study influence of parameters of brakes components and dynamic weight on vehicle. Car of Suzuki Katana is taken as sample of a braking study. Data was procured in the mechanical engineering laboratory of Tadulako University and in the Duty Communication of District of Kayumalue in North Palu. Result of calculation indicates that oil pressure put on the brakes pw (kg/cm2), tread force of a brake pedal Q (kg) and dynamic weight of vehicle (kg) both front wheels and rear wheels weights are parameters which are significant in studying the brakes system
RANCANG BANGUN KINCIR ANGIN SAVONIUS UNTUK MEMBANGKITKAN ENERGI LISTRIK SKALA KECIL
Get PDFThe aim of this paper is to design and construct a Savonius windmill generating electrical energy in small scale. For generating power 100 watts at wind velocity 4 m/s are find out dimensions of rotor 0.72 m of wide and 0.8 m of height. Rotor is made in two series. The result of experiment at power and wind velocity planning are 51.8% of efficiency and 45.864 watts of power generatin