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Putu Lokantara
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Tinjauan Beban Aerodinamis Terhadap Kinerja Stabilitas Arah Kendaraan I Ketut Adi Atmika; I Putu Lokantara
Jurnal Energi Dan Manufaktur Vol 4, No.2 Oktober 2010
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Beban aerodinamis atau gaya dan momen angin pada kendaraan dapat mempengaruhi kinerja kestabilan arahkendaraan. Seberapa besar pengaruhnya tentunya tergantung dari kondisi beban angin itu sendiri dan kondisi operasikendaraan.Penelitian ini dititik beratkan pada bagaimana memformulasikan beban dan momen aerodinamis dalam suatuplant kinerja stabilitas arah kendaraan. Analisa gerak kendaraan menggunakan metode Quasi Dinamik dan disimulasikanpada kondisi jalan datar dan jalan miring.Besarnya pengaruh beban aerodinamis terhadap prilaku arah kendaraan pada kondisi jalan datar dan jalanmiring berkisar antara 0 sampai dengan 0,00399 ditunjukkan oleh nilai yaw. Sedangkan sifat belok kendaraan awalnyaundersteer, kemudian dengan bertambahnya sudut steer tahap tertentu mengalami oversteer.
Kekuatan Tarik dan Lentur pada Material Komposit Berpenguat Serat Jelatang I Gede Putu Agus Suryawan; NPG Suardana; I Ketut Suarsana; I Putu Lokantara; I Ketut Jaya Lagawa
Jurnal Energi Dan Manufaktur Vol 12 No 1 (2019)
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (525.669 KB) | DOI: 10.24843/JEM.2019.v12.i01.p02

Abstract

Material komposit telah dikembangkan sebagai material alternatif pengganti logam dan kayu. Komposit dari matrik epoksi dengan penguat serat alam sedang dikembangkan, karena serat sintetis sulit terurai secara alami. Komposit dengan penguat serat alam lebih ramah lingkungan. Tanaman jelatang (stinging nettle) merupakan tanaman yang memiliki serat pada kulit batang. Tanaman jelatang tumbuh di seluruh wilayah Indonesia yang beriklim sedang. Di Bali banyak tumbuh di daerah Pupuan-Tabanan. Sifat yang khusus dari serat jelatang adalah kuat dan ringan. Penelitian ini bertujuan untuk mengetahui kekuatan tarik dan lentur komposit epoksi dengan penguat serat jelatang dengan fraksi volume 10%, 15%, dan 20% serat, perlakukan serat dengan NaOH 6% direndam selama 2 jam, panjang serat 5 mm dengan orientasi acak. Komposit dicetak dengan metode hand lay up. Hasil yang didapat dari penelitian ini adalah kekuatan tarik komposit mengalami kenaikan dengan bertambahnya fraksi serat. Nilai kekuatan lentur tertinggi didapatkan pada fraksi volume serat 20% sebesar 46,693 MPa. Composite material has been developed as an alternative material, it is substitute for metal and wood. Composites from epoxy with natural fiber reinforcement are being developed, because synthetic fibers are difficult to decompose naturally. Composite with natural fiber reinforcement is more environmentally friendly. Stinging nettles are plants that have fiber on the bark. Nettle plants grow in sub-district of Indonesia with temperate climates. In Bali many grow in the Pupuan-Tabanan area. The special properties of nettle fibers is strong and light. This study aims to determine the tensile and flexural strength of epoxy composites reinforcement nettle fibers with a volume fraction of fibers 10%, 15%, and 20%, treatment fibers with 6% NaOH, soaked for 2 hours, 5 mm fiber length with random orientation. Composites are product using the hand lay up method. The results obtained from this study are that the composite tensile strength increases with rise fiber fraction. The highest flexural strength value was obtained at 20% fiber fraction of 46.693 MPa.
Sifat Mekanis Komposit Polyester dengan Penguat Serat Sabut Kelapa I Made Astika; I Putu Lokantara; I Made Gatot Karohika
Jurnal Energi Dan Manufaktur Vol 6 No 2 (2013): Oktober 2013
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

AbstrakPenggunaan serat alam sebagai penguat komposit dalam beberapa tahun terakhir inimengalami perkembangan yang sangat pesat. Salah satunya adalah serat sabut kelapa.Potensi sabut kelapa yang begitu besar belum dimanfaatkan sepenuhnya untuk kegiatanproduksi yang mempunyai nilai tambah ekonomis. Dengan tidak adanya pemanfaatan yangoptimal, sabut kelapa ini hanya akan menjadi limbah dan menimbulkan masalah lingkungan.Penelitian ini bertujuan untuk menyelidiki sifat mekanis yaitu kekuatan tarik, impact dan lenturdari komposit polyester yang diperkuat dengan serat sabut kelapa. Di masa depan, kompositini dapat digunakan sebagai asesoris kendaraan, plafon ataupun papan sebagai penggantikayu, eternit, bambo dan gipsun yang harganya mahal dan relatif tidak tahan air. Kompositdibuat dengan memanfaatkan serat sabut kelapa dan matriks resin Unsaturated-Polyester(UPRs) jenis Yucalac 157 BQTN, campuran 1 % hardener jenis MEKPO (Methyl Ethyl KetonePeroxide) dan perendaman serat dalam larutan alkali NaOH 5%. Metode produksi yangdigunakan adalah press hand lay up dengan orientasi serat acak. Desain komposit denganvariasi fraksi volume serat 20, 25 dan 30% dan variasi panjang serat 5, 10 dan 15 mm. Hasilpenelitian menunjukkan bahwa semakin besar fraksi volume dan panjang serat dalamkomposit maka kekuatan tarik, impact dan lentur semakin tinggi. Mode patahan yang teramatiadalah patah getas, debonding, pullout dan crack deflection.Kata kunci: Komposit, sabut kelapa, sifat mekanis, mode patahanAbstractThe use of natural fibers as reinforcement of composites in recent years has been developingvery rapidly. One of the natural fiber, coconut coir fiber has not been fully utilized for theproduction activities, so it is just going to be a waste and cause environmental problems. Thepurpose of this study is to investigate the mechanical properties i.e. tensile strength, impactstrength and flexural strength of composites coir fiber. In the future this material can be usedfor vehicle accessories, ceilings and cabinet and will be able to replace the wood, eternit,bamboo and gipsun which are high price and lower water resistance.The research materialmade with coconut coir fiber as reinforcement and matrix resin unsaturated polyester (UPRs)type Yukalac BQTN 157, with 1% hardener types MEKPO (Methyl Ethyl Ketone Peroxide) andfiber treatment by 5% NaOH. Production methods are press hand lay-up and the variations offiber volume fraction are 20, 25 and 30% and fiber length are 5, 10 and 15 mm. Testing ofmechanical properties are impact test (ASTM - D256), tensile test (ASTM - D3039) and flexuraltest (ASTM - D790). The results of research show that the longer of fiber and the bigger offiber volume fraction, the higher of tensile strength, impact strength and flexural strength areobtained. The fracture mode are overload, debonding , pullout and crack deflectionKeywords: Composites, coir fiber, mechanical properties
Kekasaran Permukaan Baja Karbon Sedang Akibat Proses Sand-Blasting dengan Variasi Jarak Nosel I Made Widiyarta; I Made Parwata; I Putu Lokantara
Jurnal Energi Dan Manufaktur Vol 8 No 2 (2015): Oktober 2015
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak:Proses sand-blasting merupakan proses yang dilakuan untuk membersihkan dan merubah kekasaran permukaan material. Proses ini umumnya dilakukan sebelum melakukan proses pelapisan permukaan material dengan tujuan untuk meningkatkan daya rekat lapisan pada permukaan material yang dilapisi. Pada penelitian ini, proses sand-blasting dilakukan pada baja karbon sedang dengan variasi jarak nosel untuk memperoleh perubahan kekasaran permukaan material. Hasil pengujian menunjukkan perubahan jarak nosel pada proses sand-blasting memberikan pengaruh yang cukup signifikan pada kekasaran permukaan. Kata kunci: sand-blasting, baja karbon sedang, kekasaran permukaanAbstract:Sand-blasting is a process of surfaces treatment to clean and to roughen surface of material. This process is commonly used in preparing the surface before the coating process in order to increase the bond strength of the coating material on the surface of substrate material. In this work, sand-blasting process is conducted to the medium carbon steel with varying nozzle distance to the surface of material. The experiment results show the different nozzle distance causes the change of surface roughness significantly. Keywords: sand-blasting, carbon steel, surface roughness
ANALISIS ARAH DAN PERLAKUAN SERAT TAPIS SERTA RASIO EPOXY HARDENER TERHADAP SIFAT FISIS DAN MEKANIS KOMPOSIT TAPIS/EPOXY Putu Lokantara; Ngakan Putu Gede Suardana
Jurnal Energi Dan Manufaktur Vol 2, No.2 Desember 2007
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Tapis kelapa (Coconut filter) as natural fiber, in this time its resources very copius but no longer be exploited and thrown off hand as waste though in fact its used for other material dissimilar inovatif and high economic valuable that is as one of natural fiber alternative to be composite. The objective of this research is to investigate the behavior changing of physical and mechanical properties of composite tapis kelapa as reinforcement and epoxy 7120 with hardener Versamid 140 as matrix. The fiber is treated with the chemical NaOH and KMnO4 with percentage 0.5%, 1%, and 2% in weight, respectively. The ratio of epoxy and hardener is 7:3 and 6:4, and fiber orientation 0o, 45o, dan 90o. For testing of the speciment in tensile test with ASTM standard D3039 and three point bending test with ASTM standard D790. The result of this research obtained that fiber treatment with KMnO4 give the better effect to machine properties compared to NaOH. Variation of percentage 0.5%, 1%, and 2% NaOH and KMnO4 give the effect in fiber surface which higher percentage make the cleaner of surface, decrease of wax contain, and roughness of fiber surface so that stronger of linkage of fiber and matrix and increase of tensile strength, bending strength, and bending modulus of the composite. The highest tensile strength, modulus of elasticity and bending strength are 70.23 MPa, 446.24 GPa and 97.81 MPa respectively reached at composite with ratio epoxy/hardener 7:3; by 2% KMnO4 and fiber orientation 45o. While the highest modulus of elasticity is 385.48 GPa reached at composite with the ratio epoxy/hardener 6:4; 2% KMnO4 and fiber orientation 90o. Keywords: Tensile Strength, bending strength, ratio of epoxy/hardener, NaOH, KMnO4
Study of Fiber Treatment and Water Absorption toward Tensile Stength of Coconut Filtrate/Polyester Composite Putu Lokantara; Ngakan Putu Gede Suardana
Jurnal Energi Dan Manufaktur Vol 3, No.1 April 2009
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Tapis Kelapa (coconut filter) as natural fiber, in this time it resourches very copius but no longer be exploited off hand andwaste though in fact it used for alternative to be composite. The objective of this research is to investigated tensile strength ofcomposite tapis kelapa as reinforcement and epoxy 7120 and hardener versamid 140 as matrix. The fiber is treated with thechemical NaOH with percentage 0,5%, 1% dan 2% in weight, respectively. This research used coconut-tapis fibre which cutas long as 1cm with 0%,5%,7,5%,10% fiber volume fraction, respectively. Soaking time on the water are 24 hour, 48 hour,98 hour and 196 hour, respectively. For testing of speciment in tensile test with ASTM D3039. The result of this researchshown that the composite with no treatment with NaOH have soak the water better than the composite with treatment NaOH.The average of tensile strength with no treatment NaOH less than with treatment NaOH. The highest strength are reached bycomposite with 10% fraction volume on 48 hour soaking time equal to 52 MPa. While the lowest tensile strength are reachedby composite with 0% fraction volume fibre equal to 16,667 MPa. The average of tensile strength that soak in mineral waterbetter than sea water.
Pengaruh Panjang Serat pada Temperatur Uji yang Berbeda Terhadap Kekuatan Tarik Komposit Polyester Serat Tapis Kelapa I Putu Lokantara; Ngakan Putu Gede Suardana; I Made Gatot Karohika; Nanda -
Jurnal Energi Dan Manufaktur Vol 4, No.2 Oktober 2010
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Penelitian ini bertujuan untuk mengetahui pengaruh variasi panjang serat dan temperatur udara terhadap kekuatan tarikkomposit polyester tapis kelapa dengan variasi panjang serat tapis kelapa yaitu 5 mm, 10 mm dan 15 mm sedangkan variasitemperatur udara yaitu - 5° C, 10° C dan 25° C.Komposit yang dibuat menggunakan penguat serat tapis kelapa dengan matrik berupa resin unsaturated polyester( UPRs ) jenis Yukalac 157 BQTN-EX dengan 1% hardener jenis MEKPO. Komposit dibuat dengan teknik press hand lay-updengan fraksi volume serat tapis kelapa 12,2%. Perlakuan komposit berpenguat serat tapis kelapa berupa post curingselama 2 jam dengan suhu 65° C. Spesimen uji komposit berpenguat serat tapis kelapa dipotong sesuai standar ASTMD3039 untuk spesimen uji tarik.Hasil pengujian menunjukan variasi panjang serat dan temperatur udara mempengaruhi kekuatan tarik padakomposit berpenguat serat tapis kelapa. Pada komposit panjang serat 5 mm kekuatan tarik maksimal terjadi padatemperatur udara 25° C dengan kekuatan tarik 15,77 MPa, selanjutnya untuk komposit panjang serat 10 mm kekuatan tarikmaksimal terjadi pada temperatur udara 25° C dengan kekuatan tarik 14,47 MPa, sedangkan untuk komposit panjang serat15 mm kekuatan tarik maksimal terjadi pada temperatur udara 25° C dengan kekuatan tarik 12,84 MPa. Untuk moduluselastisitas tarik pada komposit berpenguat serat tapis kelapa, pada komposit panjang serat 5 mm nilai modulus elastisitastarik maksimal terjadi pada temperatur udara 25° C sebesar 297,46 MPa, selanjutnya untuk komposit panjang serat 10 mmnilai modulus elastisitas tarik maksimal terjadi pada temperatur udara 25° C yaitu sebesar 522,47 MPa, sedangkan nilaimodulus elastisitas tarik maksimal pada komposit panjang serat 15 mm terjadi pada suhu 25o C yaitu sebesar 582,43 MPa.
Studi sifat mekanis komposit epoxy berpenguat serat sisal orientasi acak yang dicetak dengan teknik hand-lay up I Wayan Surata; I Putu Lokantara; Ade Putra Arimbawa
Jurnal Energi Dan Manufaktur Vol 9 No 2 (2016): Oktober 2016
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak:Tanaman sisal tumbuh liar di daerah kering berbatuan seperti di pulau Nusa Penida kabupaten Klungkung, yang oleh penduduklokal disebut tanaman bagu. Serat sisal sangat kuat oleh karena itu dahulu banyak digunakan sebagai tali-temali penambatjukung atau perahu, sebelum dikenalnya tali nilon seperti saat ini. Belakangan ini serat alam termasuk sisal banyakdikembangkan sebagai penyusun komposit. Komposit serat sisal dapat dibudidayakan dengan mudah dan murah sehinggaketersediaannya bisa berkelanjutan, serta ramah terhadap lingkungan. Kekuatan mekanis komposit yang diperkuat denganserat alam dapat ditingkatkan dengan mengatur perbandingan fraksi volume serat di dalam komposit tersebut. Tujuanpenelitian ini adalah menyelidiki pengaruh fraksi volume serat terhadap sifat tarik dan lentur komposit berpenguat serat sisaldengan matriks epoxy. Serat sisal diperoleh dengan cara ekstraksi yaitu perendaman dan penyisiran, kemudian dipotongdengan ukuran panjang 3 cm. Serat sisal mengalami perlakuan dalam larutan alkali 5% NaOH selama 2 jam. Matriks yangdigunakan adalah epoxy resin, dengan hardener versamid. Komposit dibuat dengan teknik press hand lay-up, dengan variasifraksi volume serat sisal 15%, 20%, dan 25% yang disusun secara acak. Komposit hasil cetakan mengalami post curing padasuhu 65 oC selama 2 jam. Spesimen uji tarik dibuat berdasarkan standar ASTM D3039, dan uji lentur mengacu pada standarASTM D790M. Pengujian tarik dilakukan dengan mesin uji tarik universal, dan pengujian lentur dengan metode tiga titikpembebanan. Hasil penelitian menunjukkan bahwa kekuatan tarik dan modulus elastisitas tarik komposit meningkat seiringdengan meningkatnya fraksi volume serat, dan nilai optimum terjadi pada fraksi volume serat 25%, yaitu 19,77 MPa untukkekuatan tarik, dan 2,83 GPa untuk modulus elastisitas, sementara regangan tarik optimum terjadi pada fraksi volume serat15%, yaitu sebesar 1,01%. Kekuatan lentur dan modulus lentur serta regangan lentur juga meningkat seiring denganmeningkatnya fraksi volume serat, dan nilai optimum dicapai pada komposit dengan fraksi volume serat 25%, yaitu 88,48 MPa,untuk kekuatan lentur, dan 0,259 GPa untuk modulus elastisitas lentur, serta regangan lentur sebesar 7,55%.Kata kunci: Serat sisal, komposit epoxy, fraksi volume, kekuatan tarik, kekuatan lenturAbstract:The sisal plant (Agave sisalana) grows wild in arid areas such as the rocky island of Nusa Penida in Klungkung regency, andlocal people call bagu plants. Sisal fiber is very strong that is why it widely used as rigging on boats or ships, before they knownylon rope. Currently, natural fibers including sisal has been developed as elements to produce composites. Sisal fibers can becultivated easily and inexpensively so that availability will be sustainable and environmentally friendly. Mechanical strength ofcomposites that reinforced with natural fibers can be improved by setting the ratio of fibers volume fraction in the composite.The aim of this study was to investigate the effect of fiber volume fraction on tensile and flexural properties of composite withsisal fiber and epoxy matrix. Sisal fibers obtained with extraction process by soaking and combing, then cut to a length of 3 cm.Sisal fibers undergo treatment in an alkaline solution of 5% NaOH for 2 hours. The matrix used is epoxy resin, with a hardenerversamid. Composites was made by hand lay-up technique, with a variation of fibers volume fraction of 15%, 20%, and 25%which were arranged randomly. Composite underwent post curing at a temperature of 65 ° C for 2 hours. Tensile testspecimens were made based on the standard ASTM D3039, and the flexural test based on ASTM standards D790M. Tensiletest was conducted by using universal tensile testing machine, and flexural test with a three-point loading method. The resultsshowed that the tensile strength and tensile modulus of elasticity of the composite increases with increasing fibers volumefraction, and the optimum value occured in the fibers volume fraction of 25%, the highest value of 19.77 MPa for tensilestrength, and 2.83 GPa for the modulus of elasticity, while the strain optimum occured on the fibers volume fraction of 15%, withvalue 1.01%. Flexural strength, flexural modulus and flexural strain also increases with increasing fiber volume fraction, and theoptimum value was achieved in the composite with a fiber volume fraction of 25%, with value of 88.48 MPa for flexural strength,flexural modulus of 0.259 GPa and flexural strain of 7.55%.Keywords: Sisal fiber, epoxy composites, volume fraction, tensile strength, flexural strength
Effect of Fiber Volume Fraction and Water Absorption toward Bending Strength of Coconut Filters/ Polyester Composite I Putu Lokantara; Ngakan Putu Gede Suardana; I Made Gatot Karohika
Jurnal Energi Dan Manufaktur Vol 3, No.2 Oktober 2009
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

The variation of fibre volume and the duration of water soaking take influence on the mechanical properties of composite. This research aim is to know the influence of fraction volume fibre and soaking duration on the mineral watertoward the tensile strength and flexural of polyester-coconut-tapis composite. This research used coconut-tapis fibre which is cut 1 cm in length with 0%, 5%, 7,5%, and 10% fiber volume fraction, unsaturated-polyester (UPRs) matrix resin type Yucalac 157 BQTN-EX, and MEKPO hardener. The flexure specimen are made by press hand lay-up method and cut according ASTM D790-03 for the flexure test. The result of flexure test shows that the duration of soaking and the fiber volume fraction give a significant effect on the flexural strength of composite. The highest strength are reached by composite with 10% fibre volume on 48 hour soaking time equal to 41.994 MPa. The flexure modulus happenend shows increasing until 24 hour soaking time. The highest modulus are reached by composite with 10% fibre volume equal to 7.114 GPa while the lowest are reached by composite with 0% fibre volume equal to 3,023 GPa.
KARAKTERISTIK LAPISAN NiCr PADA BAJA KARBON SEDANG DENGAN METODE PELAPISAN FLAME SPRAY COATING DENGAN VARIASI JARAK SEMPROTAN I Made Widiyarta; I Made Parwata; I Putu Lokantara; Davin Perangin-Angin
Jurnal Mettek: Jurnal Ilmiah Nasional dalam Bidang Ilmu Teknik Mesin Vol 2 No 1 (2016)
Publisher : Program Studi Magister Teknik Mesin Universitas Udayana

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Abstract

Karakteristik lapisan NiCr pada baja karbon sedang dengan proses pelapisan powder flame spray coating dengan variasi jarak nosel penyemprotan terhadap permukaan material yang dilapisi (20 mm, 30 mm dan 40 mm) diinvestigasi. Hasil lapisan menunjukkan pada jarak penyemprotan 20 mm dan 30 mm terlihat hasil lapisan merata dan tidak terdapat celah antara material pelapis dan material induk. Sedangkan untuk hasil pelapisan pada jarak penyemprotan 40 mm memperlihatkan munculnya porosity, partikel pelapis yang tidak cair dan terdapat oksidasi/jarak antara material pelapis dan material induk.
Co-Authors Ade Putra Arimbawa Cok Istri Putri Kusuma Kencanawati Davin Perangin-Angin Dwipayana, Dwipayana Gede Widya Jaya Laksana Hendra Wijaksana I .G. P. Agus Suryawan I GAN Subawa, I GAN I Gusti Agung Kade Suriadi I Gusti Ketut Sukadana I Gusti Komang Dwijana I Gusti Ngurah Priambadi I Ketut Adi Atmika I Ketut Adi Sugita I Ketut Jaya Lagawa I Ketut Suarsana I Ketut Sudarsana I M Astika I Made Agus Putrawan, I Made Agus I Made Astika I Made Gatot Karohika I Made Parwata I Made Widiyarta I Nyoman Suprapta Winaya I Nyoman Suprapta Winaya I Wayan Bandem Adnyana I Wayan Surata I.G.P.A. Suryawan K Astawa K. Astawa M.Pd S.T. S.Pd. I Gde Wawan Sudatha . Made Arie Satryawan Made Suarda Muhammad Raihan Dwi Wibowo Mustika Mustika Nanda - Nasmi Herlina Sari NPG Suardana Rukmi Sari Hartati Suteja Suteja T. P Surya Topan Gusti Wibowo