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<![CDATA[Pengaruh Prosentase Serat Kelapa Sawit Terhadap Umur Fatik Beban Aksial Komposit Matriks Resin ]]>
<![CDATA[Fitri, Muhamad]]>
<![CDATA[ ROTASI Vol 21, No 4 (2019): VOLUME 21, NOMOR 4, OKTOBER 2019 ]]>
Publisher : <![CDATA[Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro ]]>
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DOI: 10.14710/rotasi.21.4.215-223
<![CDATA[Palm Oil Industries, not only provide so many benefits, but also has a negative impact in the form of organic waste as by products of palm oil industries. Therefore, the utilization of oil palm fiber waste needs to be developed, including for structural components that retain load, through various studies in order to reduce the volume of waste caused by oil palm. One of the simplest types of load is axial load. The purpose of this study is to make polymer matrix composite materials reinforced with oil palm  fiber, and then test the life cycle of fatigue failure axial load, of polymer matrix composite materials with several different percentages of fiber content. The material used as a matrix is Yukalac® 157 BTQN-EX unsaturated polyester resin (UPRs), and the catalyst uses methyl ethyl ketone peroxide (MEKPO) and Oil palm fibers as reinforcement. The content of palm oil fiber is divided into three level i.e: 3%, 5%, and 7%. The effect of the percentage content of the volume of palm oil fiber on the cycle of fatigue failure of the polymer matrix composite material were analyzed. So that later this palm matrix resin fiber composite material can really be utilized for structural components that retain load. By utilizing palm oil fiber in the production of composite materials, it is hoped that this will reduce the volume of organic waste from palm oil processing. Fatigue testing results on the percentage of palm oil fiber content of 3% obtained the shortest failure cycle life is 7.67 cycles. As for the percentage of palm oil content of 7%, the longest failure cycle was obtained to 18.33 cycles.]]>
<![CDATA[Analisis Statik Pelat Penyambung pada Ladder Frame Chassis Untuk Kendaraan Pedesaan Dengan Menggunakan Metode Elemen Hingga ]]>
<![CDATA[Pranoto, Hadi]]>;
<![CDATA[Fitri, Muhamad]]>;
<![CDATA[Sudarma, Andi Firdaus]]>
<![CDATA[ ROTASI Vol 23, No 1 (2021): VOLUME 23, NOMOR 1, JANUARI 2021 ]]>
Publisher : <![CDATA[Departemen Teknik Mesin, Fakultas Teknik, Universitas Diponegoro ]]>
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DOI: 10.14710/rotasi.23.1.%p
<![CDATA[Rangka merupakan bagian terpenting dari kendaraan yang berperan sebagai struktur yang memegang komponen-komponen penting lainnya. Pada penelitian ini, rangka struktur yang digunakan pada kendaraan AMMDes (Alat Mekanis Pedesaan) dianalisis secara numerik menggunakan perangkat lunak Solidworks. Salah satu faktor yang penting untuk diketahui apakah struktur rangka ini mempunyai kemampuan sesuai dengan kapasitas daya angkut yang ditentukan. Oleh karena itu, rangka struktur AMMDes dianalisis secara numerik untuk mengetahui berapa besar tegangan kritis dan perubahan bentuk yang terjadi pada saat beban diaplikasikan. Hasil dari simulasi numerik menunjukkan adanya tegangan yang terakumulasi pada titik tertentu. Dengan adanya konsentrasi tegangan ini, maka dapat memicu kemungkinan terjadinya kegagalan atau perubahan bentuk yang sangat signifikan pada area tersebut. Untuk itu, pelat penyambung diaplikasikan pada struktur rangka AMMDes untuk mendistribusikan tegangan ke struktur secara lebih merata dan struktur dianalisis kembali untuk mengetahui pengaruh yang ditimbulkan dari perubahan ini. Penambahan pelat penyambung atau connection plate pada area yang dimaksud di atas, terbukti dapat meningkatkan kekakuan dari struktur dan mengurangi tegangan yang muncul.]]>
<![CDATA[GEMBA KAIZEN DAN HUBUNGANNYA DENGAN PENERAPAN SISTEM MANAJEMEN KUALITAS ISO 9001 ]]>
<![CDATA[Muhamad Fitri]]>
<![CDATA[ Jurnal Teknologi Elektro Vol 7, No 1 (2016) ]]>
Publisher : <![CDATA[Electrical Engineering, Universitas Mercu Buana ]]>
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DOI: 10.22441/jte.v7i1.816
<![CDATA[Gemba kaizen adalah budaya jepang untuk melakukan perbaikan dan peningkatan secara terus atau berkesinambungan di tempat kerja. Budaya jepang ini diterapkan oleh kebanyakan perusahaan jepang di dunia. ISO 9001 sebagai sistem manajemen kualitas yang dikeluarkan oleh badan Dunia IOS (International Organization for Standardization) juga menekankan kepada organisasi mulai dari manajemen puncak sampai ke level bawah untuk melakukan peningkatan berkesinambungan (Contnuous Improvement), yang mana hal ini tertuang dalam beberapa klausul ISO 9001. Diantaranya klausul 4.1.f, Klausul 5.4.1.b, dan Klausul 5.4.2.b serta ada satu kalusul khusus yang membicarakan tentang perbaikan berkesinambungan ini yaitu Klausul 8.5.1. Penelitian ini dimaksudkan untuk mempelajari penerapan gemba kaizen serta hubungannya dengan penerapan continuous improvement pada sistem manajemen kualitas ISO 9001. Dari hasil penelusuran literatur didapat bahwa antara gemba kaizen dan Continuous Improvement pada sistem manajemen Mutu ISO 9001 adalah memang sejalan sehingga bagi organisasi yang sudah menerapkan gemba kaizen, ketika akan menerapkan sistem manajemen kualitas ISO 9001 sebenarnya sudah lebih dulu meneruapkan Continuous Improvement pada Standard sistem manajemen kualitas ISO 9001, sehingga perusahaan itu akan sangat mudah beradaptasi dengan sistem manajemen mutu ISO 9001 baru diterapkan tersebut. Kata-kata kunci : Gemba Kaizen, ISO 9001, continuous improvement ]]>
<![CDATA[Pengaruh Waktu Penahanan pada Perlakuan Panas Paska Pengelasan terhadap Ketangguhan Sambungan Las Baja ]]>
<![CDATA[Muhamad Fitri]]>;
<![CDATA[Bambang Sukiyono]]>;
<![CDATA[Martua Limido Simanjuntak]]>
<![CDATA[ SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol 13, No 2 (2019): SINTEK JURNAL ]]>
Publisher : <![CDATA[University of Muhammadiyah Jakarta ]]>
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DOI: 10.24853/sintek.13.2.80-86
<![CDATA[One of the welding methods that is widely used today because it is easier to operate, more practical in its use, can be used for all welding positions and more efficient is called Shield Metal Arc Welding (SMAW). In this welding, the base metal and filler metal will experience thermal cycles which lead to local heating and cooling processes resulting in residual stress and distortion in the material. This residual stress must be removed because it causes a decrease in the mechanical properties of the material. The most widely used method is the thermal method that is by Post Weld Heat Treatment (PWHT). The success of The post-weld heat treatment in removing residual stresses in PWHT is influenced by the holding time. This study aims to examine the effect of holding time on heat treatment, on the weld toughness of steel. In this study, the type of welding used was SMAW welding, the material used was steel AISI 4130, the electrodes used were LB-7018-1 standard application and AWS classification A5.1 E7018-1. The test holding temperature is 650oC. The holding time of testing uses three variables, namely: 2.5 hours, 4.5 hours, 6.5 hours. The Impact testing is done by the Charpy method. From this study, the influence of holding time variation on PWHT holding temperature on the weld strength of AISI 4130 steel was obtained.]]>
<![CDATA[THE EFFECT OF COCONUT COIR FIBER POWDER CONTENT AND HARDENER WEIGHT FRACTIONS ON MECHANICAL PROPERTIES OF AN EPR-174 EPOXY RESIN COMPOSITE ]]>
<![CDATA[Muhamad Fitri]]>;
<![CDATA[Shahruddin Mahzan]]>;
<![CDATA[Imam Hidayat]]>;
<![CDATA[Nurato Nurato]]>
<![CDATA[ SINERGI Vol 25, No 3 (2021) ]]>
Publisher : <![CDATA[Universitas Mercu Buana ]]>
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DOI: 10.22441/sinergi.2021.3.013
<![CDATA[The development of composite materials is increasingly widespread, which require superior mechanical properties. From many studies, it is found that the mechanical properties of composite materials are influenced by various factors, including the reinforcement content, both in the form of fibers and particle powder. However, those studies have not investigated the effect of the hardener weight fraction on the mechanical properties of resin composite materials. Even though its function as a hardener is likely to affect its mechanical properties, it might obtain the optimum composition of the reinforcing content and hardener fraction to get the specific mechanical properties. This study examines the effect of hardener weight fraction combined with fiber powder content on mechanical properties of EPR-174 epoxy resin matrix composite and determines the optimum of Them. The research was conducted by testing a sample of composite matrix resin material reinforced with coconut fiber powder. The Powder content was made in 3 levels, i.e.: 6%, 8%, and 10%. While the hardener fraction of resin was made in 3 levels, i.e.: 0.4, 0.5, and 0.6. The test results showed that pure resin had the lowest impact strength of 1.37 kJ/m2. The specimen with a fiber powder content of 6% has the highest impact strength i.e.: 4.92 kJ/m2. The hardener fraction of 0.5 has the highest impact strength i.e.: 4.55 kJ/m2. The fiber powder content of 8% produced the highest shear strength i.e.: 1.00 MPa. Meanwhile, the hardener fraction of 0.6 has the highest shear strength i.e.: 2.03 MPa.]]>
<![CDATA[The Regression Models of Impact Strength of Coir Coconut Fiber Reinforced Resin Matrix Composite Materials ]]>
<![CDATA[Muhamad Fitri]]>;
<![CDATA[Shahruddin Mahzan]]>
<![CDATA[ International Journal of Advanced Technology Vol 1, No 1 (2020) ]]>
Publisher : <![CDATA[Institute for Research on Innovation and Industrial System (IRIS) ]]>
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DOI: 10.37869/ijatec.v1i1.12
<![CDATA[The need of coconuts in Indonesia is relatively high. The use of large quantities of coconuts produces large amounts of organic waste from coco fiber, which tends to become waste if it is not used to be beneficial for humans.One of the potential uses of coconut fiber is as a reinforcement of natural fibers in polymer matrix composite materials. Recently, the applications of composite materials have been expanded widely including structural angine component which whitstand certain load like impact load. But most of them used synthetic fiber. Although the use of natural fibers as reinforcement in composite materials has been widely studied, their use is still limited because natural fibers have their own advantages and disadvantages. The purpose of this study was to measure the impact strength of specimens of coconut fiber reinforced polymer matrix composite material, and to determine the effect of the length and concentration of coconut fiber on its impact strength. A significant and valid regression model was also generated in this research, that states the relationship between fiber length and fiber content of resin matrix composite material to its impact strength. The result shows that the impact strength of the samples were influenced by fiber content and fiber length. The regression models for the impact strength of resin composite reinforced with coconut fiber is Y = 4.44 +0.180 X1 – 0.52 X2 Where: Y = Impact Strength (kJ/m2), and X1= Fiber length (mm), and X2= Fiber content (%).]]>
<![CDATA[The Mechanical Properties Requirement for Polymer Composite Automotive Parts - A Review ]]>
<![CDATA[Muhamad Fitri]]>;
<![CDATA[S. Mahzan]]>;
<![CDATA[Fajar Anggara]]>
<![CDATA[ International Journal of Advanced Technology in Mechanical, Mechatronics and Materials Vol 1, No 3 (2020) ]]>
Publisher : <![CDATA[Institute for Research on Innovation and Industrial System (IRIS) ]]>
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DOI: 10.37869/ijatec.v1i3.38
<![CDATA[Indonesia has a large variety of natural fibers in abundance. Some of natural fibers become organic waste if not used for something needed by humans. One of the potential uses of natural fiber composite materials is to be used in automotive components. But before natural fiber composites are used in automotive components, it is necessary to examine first what are the requirements for mechanical properties or other properties required by the automotive components. Especially the automotive components which have been made from Polymers, like dash board, Car interior walls, front and rear bumper and Car body, etc. Each of these automotive components has different function and condition, and that caused different mechanical properties needed. The purpose of this study is collecting the data from the literature, related to the properties needed for these automotive components. This study was conducted by studying the literature of research journals in the last 10 years. From the research journals, data on the requirements of mechanical properties for automotive components will be collected. Furthermore, the data of mechanical properties required for automotive components can be used as a reference to determine the reliability of automotive components made from composite]]>
<![CDATA[Peningkatan Ulang Alat Uji Putar Kritis Poros Beban Menggunakan Metode VDI 2221 ]]>
<![CDATA[Glennart Sahat Rubian]]>;
<![CDATA[Muhamad Fitri]]>
<![CDATA[ JURNAL UNITEK Vol. 16 No. 1 (2023): Januari - Juni ]]>
Publisher : <![CDATA[Sekolah Tinggi Teknologi Dumai ]]>
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DOI: 10.52072/unitek.v16i1.563
<![CDATA[Mengukur titik putaran kritis suatu poros diperlukan suatu alat uji yang mampu menguji putaran kritis suatu poros dengan beberapa parameter yang dijadikan acuan pada saat proses pengujian seperti beban pada poros, panjang poros, sifat material poros dan juga diameter poros. Karenanya perlu dirancang dan dibuat sedemikian rupa alat uji putaran kritis poros yang lebih fleksibel. Proses modifikasi alat uji putaran kritis menggunakan metode VDI 2221 dengan metode ini dipilih agar proses modifikasi dan pembuatan alat ini dipilih yang paling efektif. Adapun spesifikasi model alat uji ini dengan disk, serta 2 macam poros dengan panjang 600mm dan 1000mm menggunakan parameter kecepatan 1000rpm, 2000rpm, 3000rpm, 4000rpm, 5000rpm, dan 6000rpm dengan 2 macam panjang poros 600 mm sampai 1000 mm, serta dapat memutar poros sampai dengan kecepatan 2750 rpm. Hasil dari penelitian ini adalah sebuah alat uji putaran kritis poros yang dapat menampilkan putaran kritis suatu poros serta dapat mengetahui defleksi yang terjadi saat terjadinya putaran kritis yang mana alat uji yang dibuat nantinya dapat digunakan sebagai alat praktikum ataupun penelitian mahasiswa dan juga bahkan penelitian dosen]]>
<![CDATA[PENGARUH PENGUAT MATERIAL ALTERNATIF SERBUK CANGKANG TELUR DAN SERAT IJUK TERHADAP KEKUATAN IMPAK KOMPOSIT RESIN EPOKSI ]]>
<![CDATA[Muhammad Edi Laksono]]>;
<![CDATA[Muhamad Fitri]]>;
<![CDATA[I Gusti Ayu Arwati]]>
<![CDATA[ Journal of Scientech Research and Development Vol 6 No 1 (2024): JSRD, June 2024 ]]>
Publisher : <![CDATA[Ikatan Dosen Menulis ]]>
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DOI: 10.56670/jsrd.v6i1.314
<![CDATA[Dalam upaya menciptakan bahan material alternatif yang ramah lingkungan, penelitian ini bertujuan untuk mengetahui sifat mekanis komposit resin epoksi berpenguat material dari serbuk cangkang telur, serat ijuk dan campuran dari keduanya melalui pengujian impak. Melalui tinjauan literatur dari penelitian terdahulu, memperkuat gagasan bahwa bahan komposit alami memiliki potensi yang signigikan dalam aplikasi industri. Penelitian ini fokus pada interaksi antara serbuk cangkang telur dan serat ijuk dalam komposit resin epoksi serta kekurangan penelitian sebelumnya terkait kekuatan impak pada komposit polimer yang diperkuat cangkang telur. Metode eksperimen digunakan dengan membuat spesimen uji dan menguji kekuatan impak sesuai dengan standar ISO 179. Hasil pengujian menunjukkan bahwa komposit resin epoksi dengan serat ijuk memberikan harga impak terbesar, diikuti oleh komposit dengan campuran keduanya dan serbuk cangkang telur memiliki harga impak paling kecil. Campuran bahan penguat mempengaruhi besarnya harga impak. Penelitian ini memberikan kontribusi dalam pemahaman lebih lanjut tentang analisis sifat mekanis komposit resin dan memberikan wawasan praktis dalam pemanfaatan limbah alam sebagai bahan komposit ramah lingkungan untuk industri.]]>
<![CDATA[Becoming an International Brand: A Case Study of Starbucks ]]>
<![CDATA[Azriuddin, Muhammad]]>;
<![CDATA[Kee, Daisy Mui Hung]]>;
<![CDATA[Hafizzudin, Muhammad]]>;
<![CDATA[Fitri, Muhamad]]>;
<![CDATA[Zakwan, Muhammad Afiq]]>;
<![CDATA[AlSanousi, Dalal]]>;
<![CDATA[Kelpia, Aman]]>;
<![CDATA[Kurniawan, Olivia]]>
<![CDATA[ Journal of The Community Development in Asia Vol 3, No 1 (2020): Journal of The Community Development in Asia (JCDA) ]]>
Publisher : <![CDATA[AIBPM Publisher ]]>
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DOI: 10.32535/jcda.v3i1.706
<![CDATA[This paper aims to investigate how Starbucks becomes the best coffee shop worldwide and how the organization overcomes its challenges and succeed to become an international brand. Starbucks is a popular coffee restaurant from the beginning but has just become a famous brand worldwide. Starbucks has over 20,000 stores in 62 countries around the world. In 1971 Starbucks opened its first store in Seattle’s Pike Place Market. Howard Schultz joins Starbucks as a director of Retail Operations and Marketing. Starbucks focuses on its mission “Inspire and nurture the human spirit-one person, one cup, and one neighbourhood at a time. Starbucks provides a variety of drinks from hot to cold, and foods. The most famous beverage is Frappuccino® Blended Beverages. Starbucks makes a beverage menu depending on the customer's request to meet their satisfaction. Starbucks emphasizes on high-quality service from the store environment to the work environment. Starbucks promotes its products through mass media such as advertising at the television, social media, billboards, and coupon card. The paper concludes with some recommendation.]]>
