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All Journal SPEKTRUM INDUSTRI Rekayasa Mesin SITEKIN: Jurnal Sains, Teknologi dan Industri Semesta Teknika Media Mesin: Majalah Teknik Mesin JMPM (Jurnal Material dan Proses Manufaktur) Journal of Energy, Mechanical, Material and Manufacturing Engineering Adimas : Jurnal Pengabdian Kepada Masyarakat Jurnal Abdimas PHB : Jurnal Pengabdian Masyarakat Progresif Humanis Brainstorming Amalee: Indonesian Journal of Community Research & Engagement Journal of Welding Technology Jurnal Abdimas Bina Bangsa Prosiding Seminar Nasional Program Pengabdian Masyarakat Jurnal Farmasi Sains dan Praktis Ekalaya: Jurnal Pengabdian Kepada Masyarakat Indonesia Jurnal Pengabdian Pada Masyarakat Jurnal Polimesin Jurnal Studi Pemerintahan
Totok Suwanda
Universitas Muhammadiyah Yogyakarta
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Kajian Komprehensif Pengaruh Perlakuan Alkali Terhadap Kekuatan Komposit Berpenguat Serat Nanas-Nanasan (Bromeliaceae) Nuri, Sigit Hidayat; Suwanda, Totok; Diharjo, Kuncoro
Jurnal Semesta Teknika Vol 9, No 2 (2006): NOVEMBER 2006
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Penelitian ini bertujuan untuk menyelidiki pengaruh perlakuan alkali (5% NaOH) terhadap sifat tarik (tegangan, regangan, modulus elastisitas) bahan komposit berpenguat serat nanas-nanasan (bromiliaceae) dengan matrik unsaturated polyester. Karakteristik penampang patahan diselidiki dengan pengamatan menggunakan foto makro. Bahan utama penelitian adalah serat nanas-nanasan kontinyu, NaOH, dan resin unsaturated polyester. Serat yang digunakan dikenai perlakuan alkali (5% NaOH) selama 0, 2, 4, 6, dan 8 jam. Pembuatan komposit dengan metode cetak tekan pada kisaran fraksi massa serat 15% - 50. Pembuatan spesimen uji komposit dan prosedur pengujiannya mengacu pada standar ASTM D 638. Hasil penelitian menunjukkan bahwa perlakuan alkali (5% NaOH) mampu menghilangkan lapisan seperti lilin di permukaan serat sehingga serat dan resin memiliki ikatan (mechanical bonding) yang kuat. Komposit yang diperkuat serat yang dikenai perlakuan alkali memiliki kekuatan yang lebih tinggi dibandingkan dengan komposit yang diperkuat serat tanpa perlakuan.  Semakin tinggi fraksi massa serat (Wf)  maka kekuatan tariknya juga semakin besar. Pada di atas 30%, kekuatan tarik paling besar terjadi pada komposit yang diperkuat serat dengan perendaman alkali selama 4 jam, dan selanjutnya disusul oleh komposit yang diperkuat serat dengan perendaman alkali selama 2 jam pada (Wf). Komposit yang diperkuat serat perlakuan alkali selama 4 dan 2 jam juga memiliki modulus elastisitas yang lebih tinggi, yaitu masing-masing 40.71 GPa dan 50.65 GPa pada Wf sekitar 38%. Jenis patahan splitting in multiple area terjadi pada komposit yang diperkuat serat dengan perlakuan NaOH selama 4 jam, 2 jam, dan tanpa perlakuan. Namun, komposit yang diperkuat serat dengan perlakuan NaOH selama 8 jam memiliki jenis patahan patah tunggal. Berhubung penampang patahan komposit yang diperkuat serat tanpa perlakuan mempunyai mekanisme kegagalan fiber full out, maka kekuatan komposit ini pun menjadi rendah karena memiliki ikatan antara serat dan matrik yang lemah.
Pengaruh Perlakuan Alkali terhadap Kekuatan Bending Komposit Berpenguat Serat Rami dengan Matrik Polyester Suwanda, Totok; Nur Rahman, Muhammad Budi
Jurnal Semesta Teknika Vol 13, No 2 (2010): NOVEMBER 2010
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The objective of this study was to determine the influence of alkali treatment on the flexural strength and failure mode of jute fiber waste/polyester composite materials. The materials being used in this research werewaste of jute fibers, polyester resin, where as NaOH and aquades were utilised for alcali treatment. Prior to being embedded into polyester resin to produce composite boards employing press printing techniques (press mold), the fiber was alkalitreated for 0, 2, 4 and 6 hours by soaking into a 28% volume NaOH content solution. Flexural test was carried out in accorcance with the ASTM D790 standard, and macrographs of selected fracture surfaces of the specimens were capturedfor analysis in oerder to determine the characteristics of the fracture surfaces. Test results showed that the longer the alcali treatment time in the lower the flexural stress and strain, but the the higher the flexural modulus. The composite without alkali treatment reluted in 70.39 MPa bending stress, 1.85% bending failure strain, and 3.85 GPa bending modulus, whereas the 6 hours of alkali treatment resulted in 51.70 MPa bending stress, 1.27% bending failure strain, and 4.13 GPa bending modulus. Composite with alkali-treatmed fiberdid not exhibite any fiber pull out, and also experienced debonding due to shear forces can’t afford retained by the resin.
Optimalisasi Tekanan Kompaksi, Temperatur Dan Waktu Sintering Terhadap Kekerasan Dan Berat Jenis Aluminium Pada Proses Pencetakan Dengan Metalurgi Serbuk Suwanda, Totok
Jurnal Semesta Teknika Vol 9, No 2 (2006): NOVEMBER 2006
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Powder metallurgy is one of the manufacturing processes. Upon the process, melting process is not necessary to carry out. The powder is subsequently compacted then sintered. These processes can be conducted either separately or simultaneously.  However metallurgy processes have not been commonly developed in Indonesia yet. Therefore it is necessary to carry out preliminary research that serves as a basis for developing of further process. The effect of the independent variables of the process on mechanical and physical properties of the product will be examined. The research was conducted by arranging the independent variables which consist of pressure, temperature and sintering period whereas hardness and density of product are the dependent variables.  Aluminum will be water atomized for obtaining the powder. Response surface method is used as the experimental design method.  The method can show the effect of the independent variables individually and the interaction among the variables. Data analysis will result mathematic formula showing the functional relation. The research concludes that 170 MPa compaction pressure and 500 0C sintering temperature and 40 to 50 minutes range period of sintering produces the maximum Brinell hardness number of 47 BHN. On the other hand, the effect of the independent variables to the density has not been able to be formulated. 
Pengaruh Fraksi Volume Serat terhadap Peningkatan Kekuatan Impak Komposit Berpenguat Serat Nanas-Nanasan (Bromeliaceae) Kontinyu Searah dengan Matrik Unsaturated Polyester Nur Rahman, Muhammad Budi; Suwanda, Totok
Jurnal Semesta Teknika Vol 13, No 2 (2010): NOVEMBER 2010
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The objective of this research is to determine the effect of fiber volume fraction and alcali (5% NaOH solution) treatment on the impact strength and failure mode of continuous bromeliaceae fiber/BQTN 157 polyester composites. Specimens being tested were produced using press mold technique. Fiber volume fraction was varied from 20% to 40%, while the the soaking time of the alcali treatment was between 2 and 8 hours. Whilst the impact test was carried out in accordance with the ASTM D5941 standard, the micro-structures of the broken specimens were presented as photo macrographs. The result showed that failure energy was sharply increase, 0.22 J (69.23%), upto fiber volume fraction of 34,44%. Further increase of fiber content resulted in decreasing slope of the failure energy increase. The corresponding impact strength was found being 0,0046 J/mm2. The effect of soaking time of the alcali treatment on the failure energy and impact strength showed similar trend. Optimum result was obtained at 6 hours of soaking time, i.e. 0,27 J of failure energy and 0,0055 J/mm2 of impact strength. Eight hours of soaking time resulted in the damage of fiber surface leading to decrease of failure energy and impact srength of the resulted composites. Hinge break showing fiber pull out was observed in the failure surfaces of various fiber contents, with the increase of soaking time resulted in decrease of the amount of pulled-out fibers.
Pengaruh Sudut Water Sprayer Dan Tekanan Air Dalam Sprayer Pump Terhadap Hasil Serbuk Alumunium Pada Proses Atomisasi Air Nur Rahman, Muhammad Budi; Suwanda, Totok
Jurnal Semesta Teknika Vol 9, No 2 (2006): NOVEMBER 2006
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Metalurgi serbuk merupakan metode pembuatan benda-benda logam dengan menggunakan serbuk logam sebagai bahan dasar. Proses dalam teknologi metalurgi serbuk terdiri dari pembentukan serbuk, compacting, sintering dan finishing. Salah satu metode dalam pembuatan serbuk logam adalah dengan metode atomisasi air. Pembuatan serbuk dengan metode atomisasi air terdapat beberapa faktor yang mempengaruhi antara lain: sudut α (sudut tumbukan antara melting dengan butir air) dan tekanan air saat tumbukan. Penelitian ini bertujuan untuk mengetahui pengaruh sudut α, dan tekanan air terhadap optimalisasi hasil pembuatan serbuk dengan metode atomisasi air dan bentuk serbuk yang diamati dengan foto mikro. Proses pembuatan serbuk menggunakan metode atomisasi air dengan variabel bebasnya adalah sudut α yang ditentukan 30o, 40o, 50o dan 60o dan variasi tekanan air,  yaitu 25 kg/cm2, 30 kg/cm2, 35 kg/cm2 dan 40 kg/cm2. Bahan yang digunakan dalam proses atomisasi air adalah alumunium. Dalam penelitian ini diperoleh hasil bahwa sudut α dan tekanan tumbukan air pada melting mempengaruhi hasil produksi serbuk dengan metode atomisasi air. Hasil penelitian dengan variasi sudut α  diperoleh bahwa sudut  α = 30o menghasilkan produk 2,7%, sudut  α = 40o menghasilkan produk 4,05%, sudut α = 50o menghasilkan produk 3,23%, sudut α = 60o menghasilkan produk 1,8%. Penelitian dengan variasi tekanan air pada tekanan 20kg/cm2 tidak diperoleh serbuk, 25 kg/cm2diperoleh 2,9%, tekanan 30 kg/cm2 diperoleh 3,2%, tekanan 35kg/cm2 diperoleh 4,5% dan tekanan 40kg/cm2 diperoleh 2,9%. Hasil serbuk alumunium optimum secara teoritis dihasilkan pada sudut α 42,50 dan tekanan air 33,17 kg/cm2. Bentuk serbuk hasil proses atomisasi air sebagian besar adalah irregular, accicular dan flake.
Sifat Mekanis dan Struktur Mikro Pengelasan Gesek Baja Tahan Karat Austenitik AISI 304 Febri Irwanto, Aris Widyo Nugroho, Totok Suwanda,
Jurnal Semesta Teknika Vol 17, No 1 (2014): MEI 2014
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The aim of this study is to investigate experimentally the microstructural properties and welding strengths of the friction welded joints using austenitic stainless steel (AISI 304) base metal. The experiments were carried out using a beforehand designed and constructed experimental friction welding set-up. Firstly, the welding experiments were under different friction pressure (1,38-4,14 MPa) and upsetting pressure (6,90-8,27 MPa). Later, the strengths of the joints were examined by tension test and the results were compared with those of the base metals. Microstructures in the interfaces of the joints were also obtained and examined. The results show that porosities were observed in bondline zone for all specimens. As the friction pressure increased, the fully plastically deformed zone becomes increased.  Tensile test results indicated that, generally the joint strength is increased with an increase of the friction pressure and the upsetting pressure. The friction welded joint strenght were found to be lower than that of the base metal. The detailed fractographic observation confirmed that the brittle rupture occurred at the joint zone. 
Mikrostruktur dan Kekerasan Sambungan Pengelasan Gesek Disimilar Pipa Tembaga/Kuningan (Cu/Cu-Zn) Nugroho, Aris Widyo; Suwanda, Totok; Serena, Septian Aldo
Semesta Teknika Vol 19, No 1 (2016): MEI 2016
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This study is focused on the influence of friction time on the microstructure and the hardness values of butt  welded dissimilar pure copper/brass alloy pipes by continuous drive friction  welding. Five variation of friction times were applied during the welding processes. The joint were evaluated by microstructural analysis  and microhardness measurements. The results show that three distincs region were observed.  The grain formation in the three regions were revealed.  It was found that the hardness of the joints especially in HAZ regions were lower than that of the copper and brass base metals, while the hardness of the TMAZ region was higher than that of the copper base metal and the brass base metal. The microhardness values in the TMAZ  increased  with increasing the friction time up to 30 s and then decreased with incresing friction time.
Mikrostruktur dan Kekerasan Sambungan Pengelasan Gesek Disimilar Pipa Tembaga/Kuningan (Cu/Cu-Zn) Nugroho, Aris Widyo; Suwanda, Totok; Serena, Septian Aldo
Semesta Teknika Vol 19, No 1 (2016): MEI 2016
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Abstract

This study is focused on the influence of friction time on the microstructure and the hardness values of butt  welded dissimilar pure copper/brass alloy pipes by continuous drive friction  welding. Five variation of friction times were applied during the welding processes. The joint were evaluated by microstructural analysis  and microhardness measurements. The results show that three distincs region were observed.  The grain formation in the three regions were revealed.  It was found that the hardness of the joints especially in HAZ regions were lower than that of the copper and brass base metals, while the hardness of the TMAZ region was higher than that of the copper base metal and the brass base metal. The microhardness values in the TMAZ  increased  with increasing the friction time up to 30 s and then decreased with incresing friction time.
Analisa Kegagalan Sambungan Las Pada Tiang Penyangga Dermaga Syahputra, Koko Nusyi; Nugroho, Aris Widyo
Semesta Teknika Vol 18, No 1 (2015): MEI 2015
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Welded join failure analysis of broken jetty head strut has been carried out to find out the root cause of the failure which was obverved at the ring welding. Specimens being made of unbroken and broken struts were characterized and analyzed. The results show that the chemical composition of the based metal and the strut welded  joins especially their phosporus content were close to that of the ASTM A 252 grade 2 standard.   A common phenomenon was noted on the hardness testing result where the hardness numbers of the weld metal zone were found being higher than those of the base metal. The Widmanstatens stucture was noticed on both the weld metal and the coarse grain zone.  Further examination of the macrostructures revealed that blow holes and incomplete fusions were detected on the weld metal of the broken struts.  These flaws may the root cause of the failure because they acted as an initial crack that may propagate until fracture.
Disain Dan Fabrikasi Mesin Sputtering Skala Laboratorium untuk Penumbuhan Film Tipis Muhammad, Bagja Restu; Nugroho, Aris Widyo
Semesta Teknika Vol 20, No 1 (2017): MEI 2017
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Plasma sputtering is well known method for preparation of thin films on various substrates. This technique involves expelling material from a target onto substrate in a vacuum chamber. Generally, the technique is equipped with argon supply system for ionized gas bombardments of the target. This work shows designing and fabricating process of a simple sputtering machine without gas supply system and its preliminary thin film preparation test. A CAD software was applied to design its main apparatus namely a vacuum system and an electrical system. Afterward, those apparatus were fabricated and assembled. Preliminary test was conducted using a cooper plate as a target and plate glasses as substrates for 90 s and 130 s processing time. The vacuum pressure, voltage and the electric current were set up at 10-2 torr, 150 volt and 1 A, respectively. The thin film on the glass was visually examined and  its resistivity was measured using ohm meter. The results show that a cooper thin film has been coated on the glass with the resistivity of 12.6 and 9 Ω. At this stage , it is confirmed that the plasma sputtering machine being fabricated has successfully worked.
Co-Authors Adi Nugroho Adi Purnama Adi, Rahmad Kuncoro Aditya Kurniawan Aditya Kurniawan Ady Ryan Romadhan Agung Astuti Ahmad Janan Febrianto Ahmad Muslim Ardiyansyah, Nur Arifin Arifin Aris Widyo Nugroho Asmara, Muhammad Rafi Astuti, Agung Azhar, Chusnul Azizah, Aulia Fitri Nur Azmi, Azhim Asyratul Bambang Riyanta, Bambang Bayu Satriya Wardhana Budiantoro, Cahyo Budiyantoro, Cahyo Cahyani, Isma Afdwi Deny Fajrur Ramdani, Deny Fajrur Diharjo, Kuncoro Dwi Saputra, Muhammad Rifai Dwi Saputra, Muhammad Rifai Eko Syaifudin Febriansyah, Albyan Windra Fitroh Anugrah Kusuma Yudha Gilang Joy Habib Ramdhan Hadi Prayitno, Hadi Hakim, Moh. Hari Widada, Hari Ikhsan, Subkhan Nur Imam Crespo Padilah Imbaraga, M. Rafiudin Iswanto Iswanto Jannah, Meyriska Julianto, Achmad Zamhari krisdiyanto, krisdiyanto Krisdiyanto, Krisdiyanto Kuncoro Diharjo Kuncoro Diharjo Kusnindyasita, Anisa Muh Budi Nur Rahman, Muh Budi Nur Muhajir Muhajir, Muhajir Muhammad Budi Nur Rahman Muhammad Budi Nur Rahman, Muhammad Budi Muhammad, Bagja Restu Muhammad, Bagja Restu Muhtadi Muhtadi Mujiyana Mujiyana Mulyanti, Amelia Nur'afni Muniib, Abdin Nugroho, Ahmad Restian Adi Nur Aji Wijayanto Nur Ardiyansyah Nyeleker, Kerkulah P Pradana, Benanta Ogi Prasetyo, Satria Iman Puspitasari, Alfina Dwi Rahman, Khukuh Aulia Rahman, Muh Budi Nur Rahman, Muhammad Budi Nur Rahman, Muhammad Budi Nur Rahman, Reza Taufikur Ramdani, Deny Fajrur Reza Taufikur Rahman Rifki Febriansah Riza, Eduar Iqbal Romadhan, Ady Ryan Romi Wilza S. Sudarisman Sabtanti Harimurti, Sabtanti Santosa, Tito Hadji Agung Septian Aldo Serena Serena, Septian Aldo Sigit Hidayat Nuri Sigit Hidayat Nuri, Sigit Hidayat Sosiati, Harini Subkhan Nur Ikhsan Suminto, Joko Sunardi, Sunardi Syahputra, Koko Nusyi TH Adi Nugroho Tri Yulianto Trisnani, Wenny Nur Wahyudi, Wahyudi Wilza, Romi