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PENGARUH FRAKSI VOLUME FIBER GLASS TERHADAP SIFAT MEKANIK KOMPOSIT FIBER GLASS/EPOXY DENGAN METODE VARI Mohammad Alfian Ilmy; Ahmad Adib Rosyadi; Salahuddin Junus
STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 1 No 1 (2018): JURNAL STATOR
Publisher : STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin

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The purpose of this study was to determine the optimal volume fraction in obtaining the highest tensile strength and impact resistance. In this study, the composite material consisted of an Epoxy AB777 resin as a matrix and 300 mat fiberglass as a reinforcement, with variations in vacuum pressure (0.2 and 0.5 bar) as well as fiberglass volume fraction (Vf = 30%, 35%, 40%, 45 %, 50%) to tensile strength and impact resistance. Application of Vacuum Assisted Resin Infusion (VARI) method is by drain the resin into the reinforcement which is placed in airtight mold by using vacuum pump. From the test result, the highest tensile strength is owned by composite with Vf 50% and 0.5 bar pressure is 138,18 MPa and the lowest is owned by Vf 30% with pressure 0,2 bar is 96,60 MPa. While the highest impact resistance is owned by a composite with Vf 45% with a 0.5 bar pressure is 0.191 J / mm2 and the lowest one is owned by Vf 30% with a 0.2 bar pressure is 0.098 J / mm2. It can be concluded that, (1) Greater the vacuum pressure used, greater the mechanical strength of the composite. (2) Greater the fiber volume fraction, will increase the tensile strength of fiberglass / epoxy composites. However, 45% fiber volume fraction is the optimum volume fraction for composite impact resistance. Keywords: Fiberglass / Epoxy Composite, Mechanical properties, VARI.

PENAMBAHAN MINYAK GORENG PADA PCM PARAFFIN GUNA MENINGKATKAN KARAKTERISTIK PENYIMPANAN TERMAL PADA MEDIA PENYIMPAN PANA M. Katibi Vanhas; Robertoes Koekoeh K.W.; Nasrul Ilminnafik
STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 1 No 1 (2018): JURNAL STATOR
Publisher : STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin

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The number of energy demand these days is very high. This shows the need for new inonovation to solve the problem of energy needs, one of which is the use of Phase Change Material (PCM) as a heat exchanger material. The purpose of this research is to know the characteristics of PCM with addition cooking oil and paraffin. The percentage of cooking oil and paraffin are 30%, 40%, and 50% of total volume. The research was start with heating process during 1 hours with temperature ± 25 oC. Result of this research shows PCM paraffin - cooking oil with 50% mixture is the best cooling speed PCM, next is PCM paraffin - cooking oil 40% mixture, and the last is PCM paraffin - cooking oil with 30% mixture. On the cooling process, the 30% cooking oil mixture can hold the temperature longers than the other, while the 40% cooking oil mixture has second position, and the last is 50% cooking oil mixture. The conclusion is the addition of cooking oil can improve thermal conductivity of PCM. Keywords: Conductivity thermal, cooking oil, PCM

PENGARUH VOLUME FRAKSI PEREKAT TERHADAP KEKUATAN BENDING KOMPOSIT PARTIKEL KAYU SENGON DENGAN METODE HOT PRESS Muhammad Kurniawan; Salahuddin Junus; Robertus Sidhartawan
STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 1 No 1 (2018): JURNAL STATOR
Publisher : STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin

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Di Indonesia terdapat banyak industri kayu disebabkan Indonesia meruapakan Negara agrasis dengan sumber daya alam berapa hutan yang melimpah. Limbah dari industri kayu yaitu berupa limbah hasil gergajian yang dapat dijadikan produk baru berupa komposit partikel kayu. Serbuk kayu sengon dapat dijadikan sebagai filler. Filler pada komposit berfungsi untuk meningkatkan sifat-sifat mekanik melalui penyebaran tekanan yang efektif pada suatu komposit. Limbah gergajian kayu kemudian diayak dengan ukuran 80 mess. Resin yang digunakan yaitu jenis perekat urea formaldehida tipe UA-125 yang banyak digunakan perekat kayu pada industri meubel kayu. Pada penelitian ini variasi yang digunakan yaitu variasi volume fraksi pada perekat urea formaldehida dengan variasi 30%, 40% dan 50%. Pada penelitian ini fokus utama untuk mengetahui pengaruh variasi perekat urea formaldehida terhadap kekuatan bending dari komposit partikel kayu sengon. Pada penelitian ini terbukti bahwa pengaruh volume fraksi semakin besar maka kekuatan bending dari komposit akan semakin tinggi. Pembuatan spesimen komposit yaitu dengan metode hot press dan ukuran dimensi spesimen mengacu pada ASTM D 790 untuk pengujian bending. Data yang diperoleh setelah dilakukan uji tarik yaitu untuk variasi volume fraksi 30 % dengan nilai 7,9 MPa, untuk variasi volume fraksi 40% dengan nilai 11,9 MPa, untuk variasi volume fraksi 50% dengan nilai 12,9 MPa. Kata Kunci: komposit partikel kayu sengon, metode hot press, kekuatan bending.

PENGARUH VARIASI FRAKSI VOLUME SERAT SABUT KELAPA KOMPOSIT UNSATURATED POLYESTER TERHADAP KEKUATAN BENDING Rakhmad Fajar Pambudi; Waldhy Rifki Dermawan; Ramanda Hifani Aulia; Iqbal Varian Sembada; Qodirun Salam Musaffa
STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 1 No 1 (2018): JURNAL STATOR
Publisher : STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin

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Komposit dengan berpenguat serat sabut kelapa merupakan material komposit yang paling pesat perkembangannya. Serat sabut kelapa mempunyai banyak sekali keunggulan seperti ramah lingkungan, mudah didaur ulang, mudah dicari, dan ekonomis. Metode yang digunakan adalah press hand lay up dengan bahan serat sabut kelapa sebagai reinforced dan unsaturated polyester sebagai matrik dengan variasi fraksi volume serat sabut kelapa 0%, 5%, 7,5%, 10% dari komposit. Pengujian kekuatan bending dengan acuan ASTM D790 menunjukkan hasil pengujian kekuatan bending terbesar pada fraksi 0% serat sabut kelapa sebesar 85,5 MPa. Sedangkan kekuatan bending terkecil pada 7,5% serat sabut kelapa sebesar 25,4 MPa. Dari perhitungan dan analisa didapat bahwa serat sabut kelapa dapat menurunkan kekuatan bending pada komposit. Kata Kunci: Unsaturated Polyester, Serat Sabut Kelapa, Hand Lay up, Test Bending

Analisa Torsi Motor Bakar 4 Tak Berbahan Bakar LPG Dengan Penambahan Turbulator Pada Intake Manifold Ahmad Zainuri; Nasrul Ilminnafik; M Fahrur Rozy Hentihu
STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 1 No 1 (2018): JURNAL STATOR
Publisher : STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin

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In combustion engines, the fuel and air mixing qualities are very influential on combustion and ramification of engine performance. The addition of turbulence to the intake manifold will inflate airflow and fuel into turbulence and make the air and fuel mixture more homogeneous, thus combusting combustion. The purpose of this study was to compare the maximum torque value of fuel combustion 4 premium fuel and LPG with added turbulence variations on the intake manifold with corner blades 30o, 45o and 60o. According to the research data, the use of turbulence with the angle of the blade 30o able to provide the best torque value due to create the most optimum turbulent flow so that the fuel mixing quality becomes more perfect. Keywords: Torque, LPG, Intake manifold and Turbulator.

FABRIKASI ALAT UJI ROLLING RESISTANCE BEARING UNTUK MOBIL LISTRIK UNIVERSITAS JEMBER Singgih Kurniawan; M. Fahrur Rozy H.; F. X. Kristianta
STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 1 No 1 (2018): JURNAL STATOR
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Pentingnya suatu alat uji untuk mengetahui performa produk membuat di berbagai negara saat ini sedang berupaya membuat terobosan teknolgi terbaru untuk meningkatkan kualitas produk. Dalam usaha mengetahui kualitas besar kecilnya nilai rolling resistance pada bearing dibutuhkan alat uji khusus yang dapat menguji bearing seperti pada kondisi aktual saat mobil berjalan. Alat uji bearing memudahkan kita untuk mengenali performa suatu bearing sebelum diaplikasikan pada kendaraan. Pembuatan alat uji rolling resistance bearing ini dapat memberi informasi bearing yang mempunyai nilai rolling resistance paling kecil untuk dapat diaplikasikan pada mobil listrik. Dalam pembuatan alat uji dibutuhkan perancangan proses produksi yang tepat, pemilihan material, sambungan, dan spare part apa saja yang akan digunakan untuk menghasilkan alat uji yang akurat. Parameter pengujian bearing disesuaikan dengan karakteristik mobil yang diteliti yaitu dengan kecepatan putar bearing 310 rev/min, beban radial bearing 200 newton, serta beban aksial bearing 200 newton. Terdapat tiga tipe bearing sebagai objek penelitian yaitu tipe yang sekarang diaplikasi pada mobil listrik universitas jember. Hasil pengujian didapatkan nilai rolling resistance terendah dari masing-masing tipe bearing yaitu tipe 6002 memiliki nilai 0,23239 newton, tipe 6202 dengan nilai 0,28465 newton, dan tipe 6302 dengan nilai 0,38086 newton. Kata Kunci: Rolling Resistance, Bearing, Alat uji bearing, Mobil listrik

PENGARUH PERUBAHAN TEMPERATUR ATMOSFER TERHADAP JARAK TERBANG MAKSIMUM PESAWAT N219 PADA FASE TERBANG JELAJAH Gita Kusumastuti; Hary Sutjahjono; Dedi Dwilaksana
STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 1 No 1 (2018): JURNAL STATOR
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N219 aircraft as a plane that is still in the test flight period needs to be evaluated and refined in various fields, one of them is performance. Performance examines the achievements of flying like the maximum range that plane can take using the available fuel capacity. To determine the effect of atmospheric condition on the performance of flying then in this study given the variation of atmospheric temperature that is on the condition ISA 0, ISA+10, ISA+20, and ISA+30. Cruise is the focus of the study because this flight phase is the dominant in terms of distance, time, and fuel consumption. The method used is specific fuel consumption method. This method is used to determine the speed that can generate the maximum range. The purpose of this study was to investigate the effect of atmospheric temperature changes on the maximum range of N219 aircraft in the cruising phase. The results show that maximum range of aircraft increases with increasing temperature to the condition of ISA 0. Maximum range at ISA 0 is 1.946,48 km and continous to increase until 2.224,36 km at ISA+30. This is due to the decrease in air density by increasing atmospheric temperature to ISA 0, causing the increase in the specific air range, thus increasing the maximum range of aircraft. Keywords: Pesawat N219, specific air range, cruise

PENGARUH TEMPERATUR SINTERING SERBUK ALUMINIUM DAN SERBUK ARANG KAYU GLUGU TERHADAP KEKERASAN KOMPOSIT KAMPAS REM Rendi Prisma Wahyudi; Aris Zainul Muttaqin; Agus Triono
STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 1 No 1 (2018): JURNAL STATOR
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Kampas rem merupakan salah satu komponen dalam kendaraan yang memiliki peranan penting terhadap keselamatan dan kenyamanan pengendara. Penggunaan yang terus meningkat serta perkembangan teknologi yang semakin maju dengan banyaknya produk yang beredar dipasaran, maka penelitian ini melakukan eksperimen menggunakan metode metalurgi serbuk dengan tujuan untuk mendapatkan temperatur sintering optimal guna mencapai nilai kekerasan optimal.Penelitian ini menganalisa volume serbuk arang kayu glugu dan serbuk aluminium dengan matrik resin phenolic, dengan variasi fraksi volume (40%,20%,40%). Tahapan penelitian, pertama melakukan persiapan alat dan bahan, menimbang bahan dan melakukan pengadukan bahan secara merata, selanjutnya melakukan proses penekanan selama 10 menit dan dilakukan sintering secara bersamaan pada suhu 1250C, 1750C, 2250C selanjutnya dilakukan proses pengujian kekerasan. Dari hasil pengujian pada penelitian ini didapatkan nilai kekerasan rata-rata yang memenuhi standart kampas rem SAE J661 sebesar 68-106 HRB. Spesimen dengan suhu sintering 1250C, 1750C,2250C sebesar 71,31 HRB, 85,88 HRB, 79,85 HRB. Peningkatan suhu sintering berdampak pada bahan yang digunakan, karena peningkatan suhu dan pendinginan secara perlahan dapat menurunkan kekerasan aluminium. Selain itu resin phenolic akan cepat mengeras (sifat thermosetting) seiring peningkatan temperatur sintering dan tidak terjadi pergerakan selama kompaksi mengakibatkan porositas tidak berkurang, sehingga dapat menurunkan sifat material. Kata Kunci: kampas rem, sintering, kekerasan, metalurgi serbuk

PENGARUH PROSES HYDROTHERMAL NANOFIBER ZnO TERHADAP UNJUK KERJA DYE – SENSITIZED SOLAR CELL (DSSC) Dimas Ilham Rasyid; Harry Sutjahjono; Imam Sholahuddin
STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 1 No 1 (2018): JURNAL STATOR
Publisher : STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin

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Solar energy can be utilized as renewable energy, because fossil energy is increasingly depleted and also environmentally friendly. In this case DSSC photovoltaic devices are used to convert photon energy into electricity. The DSSC in this study consisted of alfafa leaf extract dye, nanofiber and nanowire ZnO semiconductor, iodine electrolyte, and FTO conductive glass. The method used in fabrication of ZnO nanofiber using electrospinning method, while for fabrication of nanofiber / nanowire ZnO using electrospinning method and continued with hydrothermal process. The hydrothermal process generates nanowire in ZnO nanofiber, so the active area of the ZnO semiconductor increases. With a large active area will increase the efficiency of the DSSC. ZnO nanofiber monomers and nanofiber / nanowire ZnO were characterized using SEM, while DSSC performance was tested under a 1000W halogen lamp. The DSSC is made with 2 layer, 3 layer, 4 layer and 5 layer nanofiber layers resulting in efficiency of 0.0030%, 0.0076%, 0.0103% and 0.0082% respectively. While DSSC with semiconductor nanofiber / nanowire ZnO 2 layer, 3 layer, 4 layer and 5 layer yield efficiency consecutively equal to 0,0067%, 0,0163%, 0,0747%, 0,0025%. The final results show that semiconductors with an increased active area on the ZnO nanofiber / nanowire structure will improve DSSC performance. Keywords: dye – sensitized solar cell (DSSC), active area, ZnO nanofiber, ZnO nanofiber/nanowire, hydrothermal process

PENGARUH POSISI VACUUM GATE TERHADAP WAKTU INFUSE PADA PROSES VACUUM ASSISTED TRANSFER MOLDING Lazuardi Rahmadhani; Ahmad Syuhri; Aris Zainul Muttaqin
STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin Vol 1 No 1 (2018): JURNAL STATOR
Publisher : STATOR: Jurnal Ilmiah Mahasiswa Teknik Mesin

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Vacuum assisted resin transfer molding is one of the methods making products where resin as matrix sucked with pressure vacuum in moulding with tranpaent bagging.The result product of vacuum assisted resin transfer molding thinner than the hand lay up method but needs longer process of infuse. Variation position vacuum gate placed in three position different 60 %, 80% and 100% of the mold lenght and vacuum pressure -0.6 bar, -0.8 bar and -1.0 bar. Spending time the process infuse for 12 minutes 48 seconds at the vacuum gate be at 80 % of the total mold length and vacuum pressure of -1.0 bar. With varying vacuum pressure and the position vacuum gate showed engineering successful in this area to produce goods process a shorter. Keywords: Vacuum Assisted Resin Transfer Molding, Vacuum Gate , Time Infusion.

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Jawa timur

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