Studi Pengaruh Fraksi Volume Dan Susunan Serat Terhadap Kekuatan Tarik Dan Bending Komposit Resin Berpenguat Serat Rotan (Calamus Trachycoleus)

Use of natural fiber composite material started being developed in the manufacturing industry. Progress is due to the composite nature of the privilege of the composite itself, such as: has a low density, capable of biodegradable, recyclable, has good mechanical properties, and can be renewed because it comes from nature. This research aims to determine the effect of fiber volume fraction and the composition to the tensile strength and bending strength on rattan fiber reinforced composites.The research material is rattan fiber, epoxy resin and catalyst methyl ethyl ketone peroxide (MEPOXE). Shape of the specimen based on the ASTM D3039 standard for tensile test and ASTM D790-03 for the bending test. Research specimens varied in aggregate form filler fibers are straight, cross, and random with fiber volume fraction of 10%, 20%, 30%, and 40%. Manufacture of specimens using hand lay-up method. To determine the mechanical properties of the material bending test and tensile test and photo macro structure.The results showed that the addition of fiber volume fraction resulted in an increase in tensile stress and bending. The highest tensile stress occurs on the fiber volume fraction of 40% with a straight fiber composition of 31.21 MPa. The highest bending voltage obtained at 40% fiber volume fraction and the fiber composition of the cross of 194.12 MPa. Observations of macro structure indicate that fracture surface is relatively flat and shiny indicating that the rattan fiber reinforced composites are brittle

PEMANFAATAN SERAT LANTUNG (ARTOCARPUS ELASTICUS) SEBAGAI BAHAN PENGUAT KOMPOSIT UNTUK MATERIAL SALURAN LIMBAH CAIRAN GEOTHERMAL DI HULU LAIS KABUPATEN LEBONG, PROVINSI BENGKULU

Penelitian ini dilatarbelakangi pada belum dimanfaatkannya limbah cairan geothermal di Hulu Lais, Kabupaten Lebong dan melimpahnya sumber daya alam, berupa serat lantung (Artocarpus elasticus), di Provinsi Bengkulu. Limbah cairan berasal dari hasil pembuangan air geothermal yang telah digunakan untuk pembangkit uap tetapi masih memiliki temperatur tinggi. Oleh karena itu, diperlukan material yang tidak mudah terkorosi dan mampu bekerja pada suhu di bawah 100oC secara terus menerus, salah satunya adalah material komposit berpenguat serat lantung. Penggunaan serat lantung masih terbatas sebagai bahan baku kerajinan tangan dan dengan penelitian ini diharapkan dapat meningkatkan nilai ekonomi serat lantung sehingga dapat digunakan sebagai bahan baku industri. Penelitian ini bertujuan untuk mengetahui kelayakan pemanfaatan serat lantung sebagai bahan penguat komposit untuk material saluran limbah cairan geothermal di Hulu Lais Kabupaten Lebong, Provinsi Bengkulu. Bahan yang digunakan dalam peneltian ini meliputi serat lantung, resin vinyl ester dan hardener jenis methyl ethyl keton peroxide. Proses manufacturing spesimen menggunakan metoda hand lay-up dengan memvariasikan proses pengolahan serat lantung menggunakan perlakuan alkali dan fraksi volume serat lantung. Penelitian diawali dengan mengumpulkan data teknis limbah cairan geothermal di Hulu Lais Kabupaten Lebong yang meliputi temperatur, kapasitas dan kosentrasi air geothermal. Tahapan berikutnya pembuatan komposit berpenguat serat lantung, diawali dengan pengolahan serat lantung mulai dari pengambilan kulit kayu lantung hingga diperoleh serat lantung yang diikuti dengan pengambilan data karakteristik serat lantung, meliputi uji XRD dan foto SEM. Setelah itu dilakukan pembuatan komposit berpenguat serat lantung yang diikuti dengan pengambilan data karaktersitik komposit, meliputi uji tarik, impact, bending dan water absorption. Hasil dan analisa data menunjukkan bahwa limbah cairan geothermal di Hulu Lais Kabupaten Lebong memiliki pH mendekati 7 dengan temperature sekitar 60oC. Perlakuan alkali pada serat lantung mampu meningkatkan sifat fisis dan mekanis serat lantung dan komposit berpenguat serat lantung. Perlakuan alkali efektif menahan penyerapan air serta menurunkan kadar air maksimum dan koefisien difusi komposit berpenguat serat lantung

ANALISA KOROSI PADA TANGKI REAKTOR TRIGA 2000 MENGGUNAKAN METODE INSPEKSI ULTRASONIK DAN INSPEKSI VISUAL (UNDERWATER CAMERA)

A reactor is a process device where a reaction takes place, be it a chemical or nuclear reaction and not physically. Nuclear reactors are used for various purposes, namely to create, regulate, and maintain a nuclear chain reaction at a constant rate. One method of monitoring corrosion is using an ultrasonic device to measure the thickness of the tank wall and an underwater camera tool to visually see the damage that has occurred and will provide a quantitative estimate of the corrosion rate that occurs in the system by comparing the initial weight and weight after a certain time. The corrosion rate value on the TRIGA 2000 reactor wall is obtained through the weight reduction method, and has an average corrosion value of 0.10 mmpy, while the type of corrosion that occurs on the TRIGA 2000 reactor wall is the type of intergranular corrosion. protective coating by coating organic compounds (lubricant) and controlling humidity and temperature

SIMULASI ANALISIS VELOCITY ALIRAN FLUIDA PADA TANGKI REAKTOR NUKLIR MENGGUNAKAN METODE COMPUTATIONAL FLUID DYNAMICS (CFD)

Center for Applied Nuclear Science and Technology (Pusat Sains dan Teknologi Nuklir Terapan /PSTNT) is a work unit that is under and directly responsible to the Deputy for Nuclear Science and Applications of Nuclear Technology, National Nuclear Energy Agency. In PSTNT Bandung, the function of the tank is as a container to place the reactor components, the reactor shield for the heat exchanger and as a place for nuclear reactions to take place. In nuclear reactor tank flow distribution ocures in various velocity.The purpose of this practical work is to analyze the velocity of fluid flow in the reactor tank from the inlet flow to the bottom surface of the reactor and from the bottom surface to the top surface of the TRIGA 2000 reactor. The method used in this practical work is the Computational Fluid Dynamics (CFD) Velocity method. CFD is a method for simulating fluid flow. The method is processed numerically and then digitally modeled. In practice, the authors modeled and studied the conceptual design of the reactor system using CFD based on Gambit and Fluent applications in a reactor tank. GAMBIT is an application produced by fluent inc. which is useful for making a model and discrete (meshing) to be analyzed by numerical methods. Fluent is an application that can solve fluid flow cases with the results obtained after discretizing the GAMBIT application. The results by CFD shows the distribution of fluid flow from the inlet pipe to the bottom surface of the reactor tank then the flow rises to the top surface to the outlet pipe. The velocity of the fluid flow from the inlet flow to the bottom surface was getting smaller, and the smallest value was at the bottom of the nuclear reactor, by 0.164 m/s and the flow distribution from the bottom surface to the top surface of the velocity value in a nuclear reactor would be bigger by the largest value being on the top surface of the nuclear reactor is 2.9 m/s

SIFAT TARIK KOMPOSIT SERAT DAUN AGEL TANPA PERLAKUAN KIMIA DENGAN MATRIK POLYESTER DAN EPOXY

Natural fiber reinforcement polymer composites have good prospects for development in developing countries, such as Indonesia. Composite technology development of natural fiber line with government policy to explore the potential of the existing local genius. The aim of this research is to know the influence of matrix used in making composite to tensile strength of agel leaf fiber composite woven without chemical treatment, to know mechanical bond and to investigate composite fracture mechanism. Research carried out by using one type of natural fibers are leaf fibers that have been woven agel with size 20x20 cm 6 plys while matrix using unsaturated polyester and epoxy. Methods of making composites using vacuum bagging. Tensile test conducted by Tensilon tensile test machine, the shape and size of the specimens in accordance with ASTM standard D 638. Based on the results of tensile tests showed that the tensile strength fiber composite leaf agel with epoxy matrix is 31 MPa higher than the matrix unsaturated polyester which is only 25 MPa. Form of fracture happens indicate fiber pull out because of bonding (mechanical bonding) between the fiber and the matrix is low.Komposit polimer berpenguat serat alam mempunyai prospek yang sangat baik untuk dikembangkan di negara berkembang, seperti Indonesia. Pengembangan teknologi komposit berpenguat serat alam sejalan dengan kebijakan pemerintah untuk menggali potensi local genius yang ada. Tujuan penelitian ini adalah mengetahui pengaruh matrik yang digunakan dalam pembuatan komposit terhadap kekuatan tarik komposit serat daun agel yang dianyam tanpa perlakuan kimia, mengetahui ikatan mekanik dan menyelidiki mekanisme perpatahan komposit. Penelitian dilakukan dengan menggunakan satu jenis serat alam yaitu serat daun agel yang telah dianyam dengan ukuran 20x20 cm sebanyak 6 lembar sedangkan matriknya menggunakan unsaturated polyester dan epoxy. Metode pembuatan komposit menggunakan vacuum bagging. Pengujian tarik (tensile test) yang dilakukan dengan mesin uji tarik Tensilon, bentuk dan ukuran spesimen sesuai dengan ukuran standar ASTM D 638. Berdasarkan hasil uji tarik menunjukkan bahwa kekuatan tarik komposit serat daun agel dengan matrik epoxy adalah 31 MPa lebih tinggi dibandingkan dengan matrik unsaturated polyester yang hanya 25 MPa. Bentuk perpatahan yang terjadi menunjukkan adanya fiber pull out karena ikatan (mechanical bonding) antara serat dan matrik yang rendah

Comparison of Volume Fraction of Carbon Tow/Epoxy Composites Between Vacuum Infusion Manufacturing and Filament Winding Methods

Several methods can be applied in composite manufacturing, including the vacuum infusion and filament winding methods. In order to apply this method in the manufacture of composites, it is necessary to know which produces composites with a good target ratio of fiber and resin, namely 60%/40%. The aim of this research is to compare the manufacturing methods that produce the distribution of fibers and resins that are close to the target. The composites in this study used a carbon tow reinforcement material with a matrix, namely araldite LY5052 epoxy resin and aradur 5052 CH hardener. In composite manufacturing, there are three stages, namely molding preparation, process manufacturing, and demolding. Then SEM photo observations were made on the specimen pieces from the composite results with three different locations. Of the two methods, vacuum infusion produces SEM photos with denser fiber distribution than filament winding and voids produced in the filament winding manufacturing method. The volume fraction of the test on the vacuum infusion sample with an average yield of 56.79% and 54.01% for filament winding

PROSES PENGEBORAN LUBANG BUCKET EXCAVATOR MENGGUNAKAN MESIN LINE BORING DI PD. XYZ

PD. XYZ that is located in Soeprapto Dalam, Bumi Ayu, Selebar District,  Bengkulu is engaged in the metal working, construction and workshop. To facilitate the process, a machine is needed to help speed up each process. Tools  machine are used to make human work easy. Drilling process is one of the machining process that the aim is to enlarge the diameter of the excavator bucket hole. The purpose of this study are determine drilling process of a bucket excavator and observe the result of drilling on a line drilling machine. The research used a drilling line TPX6113 type that the chisel is YG6. Drilling process is carried out with three feeding process, namely 4mm, 2mm and 2 mm that the feeding speeds are 20 rpm and 31.5 rpm. The result is the smoothest process drilling in the high spee

PENGARUH POST CURING TREATMENT DAN PERENDAMAN AIR LAUT PADA KOMPOSIT HYBRID KEVLAR/KARBON

In composite engineering, there are also known hybrid composite types which allow the presence of two or more reinforcing particles and are usually arranged by a straight type and a random type. In this research, hybrid composites are made from a combination of kevlar fiber and carbon twill fiber using the vacuum assisted resin infusion (VARI) method. This fiber will be made into a composite consisting of ten layers with a composition of six layers of kevlar fiber and 4 layers of carbon twill fibers. Vinylester resin is used as a matrix on the composite. The hybrid composite material was given post curing treatment and soaked by sea water. From the tensile test results obtained an average ultimate tensile strength (UTS) value of 314.38 MPa at post curing temperature of 100 °C, then the results of compressive test of the kevlar/carbon hybrid composite with ASTM D6641 obtained an average compress strength value of 87.76 MPa at 100 °C postcuring and the results of the kevlar + carbon-vinylester composite shear test with ASTM D5379 obtained an average shear strength value of 20.45 MPa at post curing room temperature

Failure Analysis of Axial Compressor Rotor Blade on Alshtom Gas Turbine with Capacity 20 MW at PLTGU

This was the work in one of the Gas-Steam Power Plant (PLTGU) in the Southern Sumatra. The compressors on the Alsthom gas turbine suffered damage to the rotor blade section causing it to stop operations. In this study discussed the analysis of the cause of damage to the axial compressor rotor blade with the aim of knowing the causative factors of damage, the mechanism of damage, the shape of the microstructure and the size of the grain. Observations are made by direct macro observations. After making observations, it continues with the analysis of observations. From the results of the analysis, it was concluded that the damage occurred was influenced by several factors, namely corrosion, service life and environmental conditions. If the damage is compared to the size of the grain then the part that is a lot of damage has a larger grain size compared to the slightly damaged part