JMPM (Jurnal Material dan Proses Manufaktur)最新文献

{"title":"Pengaruh Dimensi Reservoir terhadap Flow Rate Pompa Infus Insulin","authors":"Rahmad Kuncoro Adi, Krisdiyanto Krisdiyanto","doi":"10.18196/jmpm.3246","DOIUrl":"https://doi.org/10.18196/jmpm.3246","url":null,"abstract":"Pompa infus insulin adalah peralatan medis semi otomatis yang digunakan untuk mengontrol tingkat gula darah penderita diabetes. Cara kerja perangkat tersebut yaitu dengan cara memasukkan insulin dari reservoir insulin kedalam tubuh pasien secara kontinu. Reservoir insulin adalah tempat penyimpanan insulin sebelum dimasukkan ke dalam tubuh pasien. Komponen utama pompa infus insulin terdiri dari pompa, motor, reservoir, tube, dan microprocessor . Perangkat tersebut memasukkan insulin sesuai dengan flow rate yang telah diatur. Dimensi dari reservoir insulin mempengaruhi flow rate perangkat tersebut. Dimensi reservoir perlu dipertimbangkan agar flow rate yang keluar dari perangkat tersebut akurat. Simulasi pemberian kecepatan fluida pada reservoir insulin dapat dilakukan dengan perangkat lunak berbasis computational fluid dynamics. Kecepatan yang dimasukkan dapat dipakai untuk menghitung flow rate fluida. Hasil penelitian ini menunjukkan bahwa simulasi perubahan diameter reservoir insulin akan mempengaruhi flow rate . An insulin infusion pump is a semi-automatic medical device used to control blood glucose level of diabetic patient. The device works by infusing insulin from the insulin reservoir into the patient's body continuously. Insulin reservoir is a container where insulin is stored before being injected into the patient's body. The main components of insulin infusion pumps consist of a pump, a motor, a reservoir, tubes and a microprocessor. The device injects the insulin according to a regulated flow rate. The dimensions of the reservoir need to be considered so that the flow rate of the insulin is delivered accurately. The simulation of fluid velocity in the insulin reservoir was carried out using a computational fluid dynamics software. The entered fluid velocity were used to calculate fluid flow rates. The results of this study indicate that the simulation of changes in the diameter of the insulin reservoir will affect the flow rate. The smaller reservoir dimension make the flow rate that comes out of the nozzle approaches the flow rate that has been set in the insulin infusion pump program.","PeriodicalId":359489,"journal":{"name":"JMPM (Jurnal Material dan Proses Manufaktur)","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122662887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluasi Ketidakcocokan Ukuran Kursi Kuliah pada Perguruan Tinggi","authors":"Rela Adi Himarosa","doi":"10.18196/jmpm.3244","DOIUrl":"https://doi.org/10.18196/jmpm.3244","url":null,"abstract":"Furnitur ruang kuliah merupakan salah satu sarana fisik penunjang pembelajaran. Kesehatan manusia saat duduk sangat dipengaruhi oleh furnitur seperti meja dan kursi yang digunakan. Aktivitas mahasiswa di perguruan tinggi banyak di kelas dengan posisi duduk statis. Duduk dalam waktu yang lama merupakan salah satu faktor yang mampu menyebabkan gangguan muskuloskeletal terutama pada bagian punggung bawah. Gejala gangguan muskuloskeletal pada remaja menjadi faktor risiko yang signifikan untuk terjadinya gangguan muskuloskeletal saat dewasa. Hasil antropometri menunjukkan ketidakcocokan dimensi furnitur yang digunakan sehingga menimbulkan rasa tidak nyaman, sakit anggota badan, dan terjadinya gangguan pada muskuloskeletal. Posisi berdiri dan duduk yang benar menjadi faktor penting untuk pencegahan masalah ini. Hasil dari penelitian ini menunjukkan ketidakcocokan antara ukuran antropometri mahasiswa dan desain kursi yang digunakan di universitas untuk proses pembelajaran. Data antropometri diambil dari ukuran 80 mahasiswa dengan sebaran 50% pria dan 50% wanita. Tiga model kursi perkuliahan dijadikan evaluasi ketidakcocokan. Model kursi 1 merupakan kursi model lama yang sudah tidak dipakai, model kursi 2 merupakan kursi yang sudah mulai digantikan, terakhir kursi model 3 merupakan kursi terbaru yang digunakan di perkuliahan. Ketiga model kursi yang ada di sebuah perguruan tinggi memiliki variasi ketidakcocokan dengan antropometri mahasiswa. Model kursi 3 produksi terbaru memiliki 100% ketidakcocokan pada tinggi meja dan sebesar 50% pada tinggi kursi. Model kursi 1 produksi lama memiliki 100% ketidakcocokan pada kedalaman kursi. Hasil evaluasi ini mampu menunjukkan model kursi yang memiliki tingkat ketidakcocokan paling kecil sehingga pemilihan model kursi terbaru harus mempertimbangkan data antropometri. Furniture at class, is one of the physical property to support the learning process. Human health is greatly influenced by furniture such as tables and chairs used when they are sitting. Student activities in university mostly done at class with static sitting positions. Sitting in a long time is one of the factors that cause musculoskeletal disorders, especially in the lower back. The symptoms of musculoskeletal disorders in adolescents is a significant risk factor for the occurrence of musculoskeletal disorders in adulthood. Anthropometric results can show a mismatch of dimensions of the furniture used, which results in discomfort, limb pain, and the occurrence of musculoskeletal disorders. Correct standing and sitting position is an important factor for the prevention of this problem. The results of this study indicate a mismatch between the anthropometric size of students and the design of chairs used at universities for the learning process. Anthropometric data was taken from 80 students with a distribution of 50% male and 50% female. Three lecture chair models were used as an mismatch evaluation. First chair model was the old model chair that is n","PeriodicalId":359489,"journal":{"name":"JMPM (Jurnal Material dan Proses Manufaktur)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131366882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Pengaruh Ketebalan terhadap Kekakuan pada Ring Fiksasi Eksternal Tulang Tibia","authors":"Krisdiyanto Krisdiyanto","doi":"10.18196/jmpm.3242","DOIUrl":"https://doi.org/10.18196/jmpm.3242","url":null,"abstract":"Fiksasi eksternal adalah perangkat yang digunakan untuk menjaga posisi fracture pada tulang stabil. Perangkat tersebut dipasang di luar soft tissue . Komponen utama fiksasi eksternal terdiri dari pin , clamp , dan rod . Fiksasi eksternal yang menggunakan rod lebih dari dua biasanya menggunakan ring sebagai penghubung. Jumlah rod pada fiksasi eksternal mempengaruhi kekakuan perangkat tersebut. Kekakuan fiksasi eksternal perlu dipertimbangkan agar posisi fracture tetap stabil. Modifikasi kekakuan pada fiksasi eksternal dapat dilakukan dengan memodifikasi dimensi komponen-komponen fiksasi eksternal. Simulasi pemberian gaya pada fiksasi eksternal dapat dilakukan dengan perangkat lunak berbasis finite element . Gaya yang dipakai sebagai beban dan displacement yang terjadi dapat dipakai untuk menghitung kekakuan fiksasi eksternal. Hasil penelitian ini menunjukan hasil simulasi perubahan ketebalan ring fiksasi eksternal akan mempengaruhi kekakuan fiksasi eksternal.  External fixation is a device that is used to keep fracture stability. External fixation is placed out of soft tissue. Pin, clamp, and rod are main components of the external fixation. External fixation that consist of two or more rods usually uses ring as connector. The number of rods affect external fixation stiffness. External fixation stiffness should be kept because healing process is affected by fracture stability. External fixation stiffness can be modified by components dimension modifications. Testing simulations of external fixation uses finite element software. Force that used as load and displacement can be used to calculate external fixation stiffness. The results of this research is external fixation ring thickness affects external fixation stiffness.","PeriodicalId":359489,"journal":{"name":"JMPM (Jurnal Material dan Proses Manufaktur)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116891701","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Deteksi Cacat Bantalan Poros Engkol Motor Pembakaran dalam Mengguakan Spektrum Envelope","authors":"B. P. Kamiel","doi":"10.18196/jmpm.3243","DOIUrl":"https://doi.org/10.18196/jmpm.3243","url":null,"abstract":"Bantalan poros engkol adalah salah satu komponen penting pada motor pembakaran-dalam (IC engine) yang dapat mengalami cacat akibat pembebanan berulang dan temperatur tinggi. Kerusakan bantalan menyebabkan penurunan kinerja mesin yang jika tidak segera dilakukan tindakan perawatan dapat mengakibatkan kerusakan total. Analisis spektrum getaran adalah teknik utama yang digunakan untuk mendeteksi cacat bantalan. Namun demikian, spektrum tidak efektif untuk mendeteksi cacat bantalan di mesin-mesin pembakaran-dalam karena menghasilkan background noise yang sangat besar sehingga menutup amplitudo getaran bantalan. Penelitian ini mengusulkan prosedur pre-processing sinyal getaran untuk mengeliminasi frekuensi-rendah-amplitudo-tinggi dan menguatkan amplitudo dari frekuensi bantalan. Penelitian ini menerapkan analisis envelope pada bantalan poros engkol motor pembakaran dalam 2 langkah. Eksperimen pada rig uji menggunakan 3 kondisi bantalan single row dari Danmotor yaitu bantalan normal (tidak cacat), cacat lintasan dalam ukuran 0,25 mm dan 0,50 mm. Kecepatan poros dijaga konstan pada variasi 1500 RPM dan 2000 RPM. Sensor akselerometer diletakkan pada blok mesin dekat dengan lokasi poros engkol untuk merekam sinyal getaran menggunakan kecepatan sampling 51200 Hz. Hasil penelitian menunjukan bahwa spektrum tidak dapat mendeteksi cacat bantalan untuk semua ukuran cacat dan kecepatan poros sedangkan spektrum envelope berhasil menampilkan BPFI dan side band yang dapat digunakan untuk mendeteksi cacat bantalan dan menentukan level cacatnya. A bearing on the crankshaft is one of critical component of the IC engine which may fault due to cyclic loading and high temperature. The vibration spectrum analysis is the main technique used to detect faulty bearings. However, it is not effective because IC engine produces a very large background noise which immerses bearing vibration amplitude. The study proposes a signal pre-processing procedure to eliminate low-frequency high-amplitude vibration and magnifies the amplitude of the bearing frequency. This paper applies envelope analysis on crankshaft bearings of two-strokes IC engine. The experiments on the test rig uses 3 condition of single row bearing from Danmotor i.e. normal bearing (healthy), inner race fault of 0,25 mm and 0,50 mm. The shaft speed of 1500 RPM and 2000 RPM is used during experiment. An accelerometer sensor is placed on the engine block near the location of the crankshaft to record vibration signals using 51200 Hz sampling rate. The result shows that spectrum fails to detect faulty bearing for all size defects and shaft speed. Meanwhile, envelope spectrum shows obvious BPFI and its side bands which can be used to detect and localize bearing fault.","PeriodicalId":359489,"journal":{"name":"JMPM (Jurnal Material dan Proses Manufaktur)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125767676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Perancangan Ulang Tataletak Fasilitas Industri Sandal dengan Metode CORELAP","authors":"Muhammad Faishal, Muhammad Khirsna Putra","doi":"10.18196/jmpm.3245","DOIUrl":"https://doi.org/10.18196/jmpm.3245","url":null,"abstract":"Tata letak pabrik yang baik dapat menempatkan berbagai fasilitas dan peralatan fisik secara teratur sehingga mendukung pekerjaan berjalan secara produktif. Penelitian kali ini dilakukan di perusahaan yang memproduksi sandal spon sebagai fasilitas di penginapan. Perusahaan ini memiliki masalah yaitu pemborosan pada aliran material di beberapa area yang seharusnya tidak diperlukan seperti dari gudang ke proses pengeleman berjarak ± 50 m. selain itu juga masih terdapat lintasan yang bersimpangan seperti pada penjahitan cup ke penjahitan sol. Penelitian ini bertujuan untuk membuat tata letak fasilitas baru yang tepat dan baik untuk mengurangi pemborosan jarak material handling yang terjadi. Metode yang digunakan dalam penelitian ini menggunakan Computerized Relationship Layout Planning (CORELAP). Dengan membuat  layout alternative sebanyak 5 dengan nilai score berbeda. Layout dengan score terkecil yang akan dipilih. Metode CORELAP merupakan metode construction yang mengubah data kualitatif menjadi data kuantitatif sehingga menentukan fasilitas pertama yang diletakkan didalam layout diperlukan data keterkaitan hubungan aktivitas. Hasil penelitian ini mendapatkan usulan tata letak fasilitas dengan CORELAP lternatif terpilih yang melakukan pengoptimalan dengan merubah 9 departemen sehingga mendapatkan pegurangan jarak total sebesar 46%, atau  menjadi 125.8 m. A good layout can assign various facilities and physical equipment on a systematically to support activities running productively. This research was conducted at a company that manufactures sponge slippers as a facility at the inn. This company has a problem that is waste in the flow of material in some areas that should not be needed such as from the warehouse to the gluing process within ± 50 m. besides that, there are still crossing trajectories such as the sewing of the cup to the sewing of the sol. This study aims to make the layout of new facilities appropriate and good to reduce the waste of material handling distance that occurs. The method used in this study uses Computerized Relationship Layout Planning (CORELAP). By making alternative layouts of 5 with different score values. The layout with the smallest score will be chosen. CORELAP method is a construction method that converts qualitative data into quantitative data so as to determine the first facility that is placed in the layout, it requires data related to the activity relationship. The results of this study get a proposed layout of facilities with selected alternative CORELAP who optimize by changing 9 departments to get a reduction in a total distance of 46% or reduce until 125.8 m.","PeriodicalId":359489,"journal":{"name":"JMPM (Jurnal Material dan Proses Manufaktur)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124049333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Thermal Characterization of Mixed Virgin-Recycle Acrylonitrile Butadiene Styrene","authors":"C. Budiyantoro, H. Sosiati, A. Nugroho, Arista Anggariawan","doi":"10.18196/jmpm.3241","DOIUrl":"https://doi.org/10.18196/jmpm.3241","url":null,"abstract":"Acr y lonitrile butadiene styrene (ABS) adalah bahan plastik yang banyak digunakan pada pembuatan komponen otomotif. Limbah ABS dari industri injection molding berupa sisa potongan runner memiliki kualitas yang baik sebagai campuran dalam siklus proses produksi. Pencampuran ini bermanfaat secara ekonomis untuk mengurangi penggunaan bahan virgin . Salah satu parameter penting dalam proses injeksi adalah sifat thermal untuk menentukan titik lebur yang sesuai, sifat thermal dari campuran bahan daur ulang dan bahan virgin akan mengalami perubahan jika dibandingkan bahan aslinya. Penelitian ini bertujuan untuk mempelajari sifat termal dari bahan acrilonitrile butadiene styrene (ABS) virgin yang dicampur dengan ABS daur ulang pada variasi 15%, 30%, dan 45% (% berat bahan daur ulang). Spesimen dibuat menggunakan mesin injeksi molding MEIKI 70 Ton dan dievaluasi sifat termalnya dengan menggunakan Differential Scanning Calorimetry (DSC) sesuai standard ASTM 3418-2015. Hasil uji DSC menunjukkan bahwa nilai glass transition temperature (Tg) pada variasi campuran  15%, 30% dan 45% masing-masing adalah 104.08 °C, 104.63 °C dan 105.46 °C. Sementara itu, untuk nilai melting temperature (Tm) dari ketiga variasi tersebut masing masing adalah 139,6 °C, 139,72 °C dan 132,2 °C, sehingga dapat disimpulkan bahwa penambahan kandungan daur ulang bahan ABS memberikan peningkatan pada nilai Tg dan penurunan pada nilai Tm meskipun tidak signifikan. Acrylonitrile Butadiene Styrene is a common material for automotive components. ABS industrial waste in the form of a cut off injection-molded runner is a high-quality plastic waste that can be used as additional material in the production cycles. For an economic reason, adding waste material is very beneficial because the amount of virgin material can be minimized. One of the important parameters on the injection molding process is a thermal related parameter; the thermal properties of mix waste-virgin material could be different from those of the virgin material. This research was aimed to evaluate the thermal properties of mix ABS waste-virgin material. The content of waste material was made in 3 variations: 15%, 30%, and 45% (% wt). The molding specimens were made by using a 70-ton injection molding machine, and the thermal properties were measured by using Differential Scanning Calorimetry (DSC) according to ASTM  3418-2015 standard. The results showed that the glass transition temperature (Tg) at waste content of 15%, 30%, and 45% are 104.08 °C, 104.63 °C, and 105.46 °C, respectively, whereas their respective melting temperatures were 139.6 °C, 139.72 °C dan 132.2 °C. Those results were lower than the temperature of virgin material. It can be said that the waste content gives effect on increasing of Tg and reducing of Tm.","PeriodicalId":359489,"journal":{"name":"JMPM (Jurnal Material dan Proses Manufaktur)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127433258","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Disain dan Pembuatan Alat Preheat Induksi pada Pengelasan Gesek Logam Dissimilar","authors":"Reza Taufikur Rahman, Aris Widyo Nugroho, Totok Suwanda","doi":"10.18196/jmpm.3240","DOIUrl":"https://doi.org/10.18196/jmpm.3240","url":null,"abstract":"Pengelasan gesek diketahui memiliki keunggulan mampu menyambung dua logam yang berbeda (dissimilar). Meskipun demikian, pengelasan ini masih mengalami kesulitan dalam proses penyambungan karena perbedaan titik lebur dari kedua logam yang disambung. Agar perbedaan suhu pada daerah yang bergesekan tidak terlalu besar, perlu dilakukan pemanasan awal /preheat pada logam dengan titik lebur yang lebih tinggi. Tulisan ini membahas disain dan pembuatan mesin preheat induksi pada las gesek logam dissimilar. Pemanas induksi yang digunakan adalah prinsip-prinsip arus eddy dengan frekuensi tinggi. Mesin preheat induksi ini terdiri atas komponen utama yaitu transformator, diode, transistor mosfet, kapasitor, kumparan kerja, induktor, dan resistor. Kumparan kerja terbuat dari pipa pejal tembaga berdiameter 5 mm, jumlah lilitan, n = 6 lilit dengan tinggi kumparan 35 mm dan diameter lilitan 40 mm. Setelah terangkai, dilakukan pengujian pada silinder pejal stainless steel berdiameter 14 mm dan panjang daerah pemanasan 30 mm. Pemanasan dilakukan sehingga silinder mencapai temperatur >600 °C. Termokopel tipe K digunakan untuk mengukur temperatur silinder. Hasil pengujian menunjukkan bahwa mesin memiliki spesifikasi berupa tegangan kerja rangkaian 20 Volt dan arus maksimal 44 ampere. Temperatur naik dengan cepat hingga 600 °C setelah 70 detik pertama kemudian naik sedikit dan stabil sampai dengan maksimum temperatur 683 °C dengan waktu pengujian sampai dengan 300 detik. Daya listrik berkisar antara 320-674 watt. Hasil ini menunjukkan bahwa mesin preheater telah berhasil dibuat dan berpotensi dapat digunakan sebagai preheater pada proses las gesek dissimilar. Friction welding is known to have the advantage of being able to connect two different metals (dissimilar). However, this welding is still experiencing difficulties in the joining process because of the different melting points of the two metals being joined. In order the temperatur difference in the rubbing area is not too large, it is necessary to do preheat the metal with a higher melting point. This paper discusses the design and manufacture of induction preheat machines in dissimilar metal friction welding. Induction heaters are applied using the principle of eddy current with high frequency. This induction preheat machine consists of main components namely transformer, diode, mosfet transistor, capacitor, working coil, inductor and resistor. The working coil was made of solid copper pipe with a diameter of 5 mm, number of turns, n = 6 turns with coil height of 35 mm and diameter of coil of 40 mm. After being assembled, testing was carried out on a solid stainless steel cylinder with a diameter of 14 mm and a length of 30 mm heating area. The heating process was conducted to achieve temperatur of the higher than 600 °C. A K type thermocouple was used to measure the temperatur. The test results showed that the machine had specifications as follows: a 20 Volt circuit working voltage, with a maximum current of","PeriodicalId":359489,"journal":{"name":"JMPM (Jurnal Material dan Proses Manufaktur)","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127367139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Degumming, Perlakuan Alkali, dan Karakterisasi Serat Pandan Berduri (Pandanus tectorius)","authors":"Sudarisman Sudarisman, Nanda Satria Atmaja, Muhammad Budi Nur Rahman, Kunto Purbono","doi":"10.18196/JMPM.3136","DOIUrl":"https://doi.org/10.18196/JMPM.3136","url":null,"abstract":"Abstrak Penelitian ini bertujuan untuk mengetahui pengaruh parameter degumming terhadap sifat tarik serat pandan berduri ( P andanus T ectorius ). Daun pandan berduri lokal direndam dalam waterbath pada suhu 95˚C selama 1, 2, 3, atau 4 jam, kemudian dipres untuk diambil seratnya. Serat kemudian direndam dalam larutan NaOH dengan kadar 2,5 wt% atau 5 wt% selama 2 jam. Selanjutnya, proses dilanjutkan dengan menetralisasi dengan direndam dalam air bersih selama 8×6jam dan dikeringkan pada suhu kamar. Uji tarik dilakukan untuk mengetahui kuat tarik, regangan dan modulus elastisitas serat. Pemisahan serat dari daun pandan berduri berhasil dilakukan. Hasil uji tarik menunjukkan bahwa serat yang dialkalisasi dengan NaOH 5 wt% diperoleh kuat tarik yang lebih rendah dibandingkan dengan yang konsentrasi NaOH-nya 2,5 wt%. Pada kadar NaOH 2,5 wt%, naiknya lama waktu perendaman sampai dengan 3 jam juga akan menaikkan kuat tarik serat. Kuat tarik, regangan patah dan modulus elastisitas tertinggi diperoleh dengan perlakuan alkali dengan kadar NaOH 2,5 wt%. Kuat tarik, regangan patah dan modulus elastisitas tertinggi, berturut-turut 203,02 MPa, 3,733% dan 11,938 GPa, diperoleh dari lama waktu perendaman 3 jam. Abstract The objective of this research is to determine the effect of degumming parameters on tensile properties of the resulted local (Pandanus Tectorius) fiber. Prickly pandanus leaves were soaked in a waterbath containing plain water at 95˚C for either 1, 2, 3, or 4 hours, then pressed to yield their fibers. The fibers were then soaked in a solution containing either 2,5 wt% or 5 wt% of NaOH for 2 hours. Next, the fibers were neutralized by soaking them in plain water for 8×6 hours, and slowly dried at room temperature. Tensile test was carried out to obtain the tensile strength, strain -to-failure and modulus of the fibers. Fiber separation from Pandanus Tectorius leaves has successfully been carried out. It was found out that pretreatment using 2,5 wt% NaOH content solution produced higher tensile strength, strain-to-failure and elastic modulus in comparison with those using 5 wt% NaOH content  solution. Tensile properties increases with the increase of soaking time up to 3 hours. The highest tensile strength, strain-to-failure and modulus, 203.02 MPa, 3.733 % and 11.938 GPa, respectively, were obtained at 3 hours of soaking time.","PeriodicalId":359489,"journal":{"name":"JMPM (Jurnal Material dan Proses Manufaktur)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123880030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sifat Tarik dan Struktur Mikro Sambungan Las Gesek Tak Sejenis Baja-Tembaga","authors":"Ady Ryan Romadhan, Aris Widyo Nugroho, Totok Suwanda, Romi Wilza","doi":"10.18196/JMPM.3133","DOIUrl":"https://doi.org/10.18196/JMPM.3133","url":null,"abstract":"Abstrak Tembaga dikenal memilki keunggulan sifat fisis sehingga sering diaplikasikan bersamaan dengan baja menggunakan teknik brazing yang membutuhkan filler. Friction welding memberikan alternatif penyambungan tak sejenis tanpa filler dan asap. Penelitian ini dilakukan untuk mengetahui efek tekanan gesek terhadap sifat mekanis sambungan las gesek pada sambungan dissimilar baja-tembaga. Silinder tembaga dan baja dibubut menjadi bentuk setengah bagian dari benda uji standar JIS Z 2201. Proses pengelasan dilakukan pada putaran 1000 rpm dengan variasi tekanan gesek sebesar 30, 35, dan 40 MPa dengan tekanan tempa 80 MPa. Waktu gesek dan waktu tempa masing-masing 5 detik. Hasil penyambungan masing-masing diamati struktur mikro, kekerasan dan sifat tariknya.  Hasil penelitian menunjukkan bahwa dengan meningkatnya tekanan gesek maka daerah TMAZ melebar. Struktur mikro berbutir halus teramati di bagian baja, sedangkan di daerah tembaga, orientasi butir berubah memanjang searah dengan permukaan sambungan. Pada daerah termomechanically affected zone (TMAZ) dan welding center zone (WCZ) kekerasan masing-masing logam turun seiring dengan kenaikan tekanan gesek. Lebar daerah TMAZ yang cukup membuat kekuatan tarik tertinggi diperoleh dari spesimen dengan variasi 35 MPa sebesar 89 MPa. Metode las ini dapat digunakan untuk penyambungan logam tak sejenis baja-tembaga dengan memperhitungkan luasan daerah TMAZ. Abstract Copper is often used along with steel due to it excellence properties by using brazing technique. Friction welding technique offers an alternative technique for joining dissimilar metal without fillers and smoke. This research purpose is to study the effect of the friction pressure on the mechanical properties of steel-cooper friction welded joints. Copper and steel bars were turned into half the shape of the specimen according to JIS Z 2201. The welding process was carried out at a speed of 1000 rpm with the friction pressures of 30, 35, and 40 MPa under an upset stress of 80 MPa for 5 seconds of friction time and upset time. The results showed that with increasing friction pressure the TMAZ area was widened in fine grained microstructure for the steel region. Whereas in the copper region, the orientation of elongated grains inline with the direction of the joining surface. In the TMAZ and WCZ areas the hardness of each metal decreases with increasing friction pressure. The sufficient width of the TMAZ results in the highest tensile strength of 89 MPa. It was obtained from the specimens with friction pressure of 35 MPa. This welding method is potentially used for dissimilar steel-copper joint by considering the area of the TMAZ region. Keywords : Friction welding, dissimilar metals joint, pressure friction, TMAZ","PeriodicalId":359489,"journal":{"name":"JMPM (Jurnal Material dan Proses Manufaktur)","volume":"354 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126594211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sifat Tarik, Bending dan Impak Komposit Serat Sabut Kelapa-Polyester dengan Variasi Fraksi Volume","authors":"Gugun Gundara, Muhammad Budi Nur Rahman","doi":"10.18196/JMPM.3132","DOIUrl":"https://doi.org/10.18196/JMPM.3132","url":null,"abstract":"Abstrak Potensi serat sabut kelapa perlu diteliti untuk dibuat komposit. Tujuan penelitian ini adalah mengetahui pengaruh fraksi volume serat sabut kelapa terhadap sifat tarik, sifat bending dan ketangguhan impak komposit dengan matrik polyester, katalis MEKPO, dan NaOH. Serat sabut kelapa yang digunakan ber diameter 0.2 mm. Komposit dibuat dengan metode cetak tekan pada fraksi volume 20-35%. Pengujian sesuai standar ASTM D638 (uji tarik), ASTM D790 (uji bending) dan ASTM D5941 (uji impak) dengan metode impak izot. Pengamatan foto makro untuk menganalisis kegagalan. Kekuatan tarik dan regangan tarik semakin meningkat dengan peningkatan fraksi volume. Modulus elastisitas tertinggi pada Vf 31,4% sebesar 0,206 GPa dan menjadi 0,11 GPa pada Vf 34,88% dengan kekuatan tarik 17,48 MPa, regangan 16.64%. Kekuatan bending meningkat dengan penambahan fraksi volume. Peningkatan kekuatan bending tertinggi (tanpa perlakuan alkali) pada fraksi volume 33,7% sebesar 34.17 MPa dan modulus bending sebesar 2.10 GPa. Peningkatan fraksi volume serat sabut kelapa dapat meningkatkan ketangguhan impak, dengan nilai tertinggi sebesar 26,42 kJ/m2 pada fraksi volume 35,84%. Penampang patah pada pengujian tarik didominasi patahan tunggal sedangkan pada pengujian bending dan impak terjadi patahan banyak serta terjadi fiber pull-out. Abstract The potential of large coir fibers needs to be investigated to make composites. The purpose of this study was to determine the effect of the volume fraction of coconut coir fiber on tensile properties, bending properties and toughness of composite impacts with a polyester matrix, MEKPO catalyst, and NaOH. Coconut coir fiber used has diameter of 0.2 mm. Composites are made by compressive with fiber volume fraction 20-35%. Tests were according to ASTM D638 standard (tensile test), ASTM D790 (bending test) and ASTM D5941 (impact test) with the izot impact method. Observation macro photo is used to analyze failure. Tensile strength and tensile strain increase with increasing volume fraction. The highest modulus of elasticity at Vf 31.4% was 0.206 GPa and it became 0.11 GPa at Vf 34.88% with a tensile strength of 17.48 MPa, strain of 16.64%. Bending strength increases with the addition of a volume fraction. The highest increase in bending strength (without alkali treatment) at 33.7% volume fraction was 34.17 MPa and bending modulus was 2.10 GPa. Increasing the volume fraction of coconut coir fiber can increase impact toughness with the highest was 26.42 kJ / m2 in the volume fraction of 35.84%. The fracture crossing in tensile testing is dominated by a single fracture while in bending and impact testing there is a lot of fracture and fiber pull-out occurs.","PeriodicalId":359489,"journal":{"name":"JMPM (Jurnal Material dan Proses Manufaktur)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114881633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}