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Mesin
Published by Institut Teknologi Bandung
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Core Subject : Engineering,
Mechanical Engineering
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Articles 5 Documents
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Search results for , issue "Vol 27, No 1 (2018)" : 5 Documents clear
Sifat Mekanik Packaging Kertas Berbahan Dasar Selulosa Alga Cladophora Mardiyati, Mardiyati; Steven, Steven; Suratman, Rochim; Santosa, Sigit Puji
Mesin Vol 27, No 1 (2018)
Publisher : Mesin

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Abstract

Alga cladophora merupakan salah satu alga yang banyak tumbuh di pesisir pantai Indonesia. Alga cladophora memiliki kandungan selulosa yang cukup tinggi sehingga sangat berpotensi untuk dimanfaatkan sebagai bahan baku material packaging kertas. Tujuan dari penelitian ini adalah mempelajari sifat mekanik kertas yang berbahan dasar selulosa alga cladophora. Pada penelitian ini, selulosa alga cladophora diekstraksi melalui beberapa tahapan proses yang meliputi proses alkalisasi dan proses hidrolisis. Proses alkalisasi dilakukan dengan merefluks alga cladophora didalam larutan NaOH (1%, 5%, 10%, 15% dan 17.5%) pada temperatur 100 ? selama 2 jam. Proses hidrolisis dilakukan dengan merefluks alga cladophora hasil alkalisasi didalam larutan asam sulfat 1 M pada temperatur 100 ? selama 2 jam. Proses pembuatan kertas dilakukan dengan metode solution casting. Kandungan selulosa diukur dengan menggunakan metode Chesson-Datta. Sifat mekanik dari kertas selulosa alga cladophora diukur dengan pengujian tarik. Dari hasil pengukuran kandungan selulosa dapat disimpulkan bahwa selulosa yang diekstrasi dengan menggunakan larutan NaOH 17.5% memiliki tingkat kemurnian yang paling tinggi, yakni 94. 76%. Selulosa yang diekstraksi dengan menggunakan larutan NaOH 17.5% menghasilkan kertas dengan permukaan yang paling halus serta memiliki kekuatan tarik dan kekakuan yang paling tinggi dibandingkan dengan kertas lainnya yang dihasilkan dalam penelitian ini, yakni 57.68 MPa dan 10.12 GPa.
Numerical Study of Experiment Setup for Aluminum Foam Sandwich Construction Subjected to Blast Load Pratomo, Arief Nur; Santosa, Sigit Puji; Gunawan, Leonardo; Putra, Ichsan Setya
Mesin Vol 27, No 1 (2018)
Publisher : Mesin

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Abstract

In the designing an armored fighting vehicle (AFV), blastworthy construction to protect military personnel from landmines explosion is urgently needed. This is due to a large number of fatalities of army personnel in the state conflict zones. To achieve this blastworthy construction, the design of AFV floor structures needs to be able to sustain structural intrusion with lower dynamic acceleration against blast load. The blastworthy structures can be achieved through absorbing the blast impact load by using an aluminum foam sandwich (AFS) construction. During the design iteration process, a good correlation between numerical simulation and blast impact experiment is required. In this study, an experimental setup to assess the AFS construction for blast load performance evaluation was introduced. This study is started with an evaluation of jigs and fixtures structural strength, load cell structure requirement, and data acquisition to record maximum displacement, maximum acceleration, and reaction force in the load cells. From the evaluation, it was found that the jig and fixture structural configuration requires high load retention at the bolt joint location to avoid high stress concentration. For the load cell structure, it is recommended to place the load cell position in the pure axial stress direction so that there is no plastic deformation interference with the instrumentation. The data acquisitions will record the acceleration and reaction force of the AFS construction. The simulation results are also used to design the load cell and to select the accelerometer capability range. This study is expected to provide a robust experimental data during blast impact load testing of blastworthy AFS floor structure. 
Design and Fabrication of Ball Punch Deformation Test of Metallic Sheet Material Asti Rosalia, Citra; Wicaksono, Satrio; Dirgantara, Tatacipta; Basuki, Arif; Setya Putra, Ichsan
Mesin Vol 27, No 1 (2018)
Publisher : Mesin

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Abstract

Predicting the behavior of sheet metal in forming process is very important to avoid material failure. The strain limit of sheet metals before tearing occurs is attainable in Forming Limit Diagram (FLD), which can be obtained experimentally or theoretically. Experimentally, FLD of a sheet metal can be achieved by performing ball punch deformation test. Unfortunately, commercially available ball punch deformation test apparatus is still very expensive. In this paper, the design, fabrication and testing process of more affordable ball punch deformation test apparatus is be presented. The ball punch apparatus has indenter?s diameter of 22.4 mm, which capable to tear 0.2-2.0 mm thick specimen blanks with maximum capacity of 200 kN. The test results are then compared with other commercially available ball punch deformation test apparatus results in the literature, and show very good agreement.
Effect of L-Citrulline from Watermelon Seed Extract as a Green Corrosion Inhibitor against the Corrosion Rate of Pipe Steel API 5L X65 Widyanto, Bambang
Mesin Vol 27, No 1 (2018)
Publisher : Mesin

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Abstract

API 5L X65 carbon steel is used in many industries, especially as oil and gas pipelines. However, this carbon steel pipe is vulnerable to corrosion at the inner surface owing to the flow of oil that is a multiphase system and contains dissolved salts. The corrosion phenomenon of the internal surface can be prevented by using an inhibitor. Most of the inhibitors used in industry are composed of compounds that are toxic and environmentally unfriendly. Consequently, the use of a natural inhibitor is at the forefront of corrosion inhibition studies. This study examines the efficiency of watermelon seed extract as an inhibitor before and after the addition of methyl ethyl glycol (MEG). The influence of L-citrulline from watermelon seed extract (WMSE) and MEG on the inhibition of corrosion of carbon steel in 3% NaCl containing acetic acid saturated by CO2 at room temperature was investigated by the immersion test, polarization test, electrochemical impedance spectroscopy (EIS), and surface analysis by scanning electron microscopy (SEM). According to the experiment results, the corrosion rate increased with the acid concentration and the effect of CO2. The corrosion rate can be inhibited by MEG, WMSE, and mixtures thereof. In comparison with 3% NaCl media containing acetic acid (HAc) 3360 ppm in saturated CO2 at room temperature, the inhibition efficiency of WMSE using polarization and EIS methods were 93.54% and 95.89%, respectively. However, based on the immersion test results, the inhibition efficiency was decreased. The inhibition efficiency of WMSE dropped after 120 hours of the immersion process by almost 40fold to 2.38%, while the efficiency of MEG was able to inhibit the surface by 80.48%. The mechanism of the inhibition by a WMSE molecule is through a chemisorption process, which forms a complex bond and generates a passive layer of Fe-WMSE.
Pembuatan dan Karakterisasi Bioplastik Pati-Kitosan Dengan Menggunakan Metode Dialisis-Solution Casting Steven, Steven; Mardiyati, Mardiyati; Widyanto, Bambang
Mesin Vol 27, No 1 (2018)
Publisher : Mesin

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Abstract

Bioplastik pati merupakan salah satu solusi yang ditawarkan untuk mengatasi permasalahan yang ditimbulkan oleh material plastik konvensional. Namun dikarenakan ketahanan airnya yang buruk, bioplastik pati umumnya digabungkan dengan material yang memiliki ketahanan air yang lebih baik, seperti kitosan. Didalam pembuatan bioplastik pati-kitosan umumnya melibatkan asam asetat yang dapat membuat bioplastik yang dihasilkan menjadi asam dan kurang baik untuk dimanfaatkan pada beberapa aplikasi. Untuk mengatasi hal tersebut, pada penelitian ini dilakukan pembuatan bioplastik pati-kitosan dengan metode dialisis-solution casting. Tujuan dari penelitian ini adalah mempelajari pengaruh penambahan kitosan didalam bioplastik pati-kitosan. Didalam penelitian ini pembuatan bioplastik pati-kitosan dilakukan dengan menggunakan metode dialisis-solution casting. Untuk mengukur peforma dari bioplastik pati-kitosan dilakukan pengujian tarik, pengujian ketahanan air serta pengujian degradasi tanah. Pengujian tarik dilakukan dengan mengacu pada ASTM D882. Berdasarkan hasil pengujian yang telah dilakukan dapat disimpulkan bahwa seiring peningkatan konsentrasi kitosan didalam bioplastik pati-kitosan akan meningkatkan kekuatan tarik, kekakuan tarik, dan ketahanan air namun menurunkan perpanjangan dan kemampuan degradasi dari bioplastik pati-kitosan.

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