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All Journal Jurnal Rekayasa Mesin JTT (Jurnal Teknologi Terapan) Manutech : Jurnal Teknologi Manufaktur JURNAL CRANKSHAFT Jurnal Konversi Energi dan Manufaktur International Journal of Applied Technology Research MACHINERY: Jurnal Teknologi Terapan Aptekmas : Jurnal Pengabdian Kepada Masyarakat Industrial Research Workshop and National Seminar Jurnal Inovasi Pengabdian dan Pemberdayaan Masyarakat
Destri Muliastri
Jurusan Teknik Mesin, Politeknik Negeri Bandung
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PENGARUH PELUMAS TERHADAP TEGANGAN ALIR DAN GAYA PENARIKAN KAWAT AISI 1006 MENGGUNAKAN METODE FEM Destri Muliastri; Devi Eka Septyani; Prayoga Lesmana
Manutech : Jurnal Teknologi Manufaktur Vol. 13 No. 02 (2021): Manutech: Jurnal Teknologi Manufaktur
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (970.626 KB) | DOI: 10.33504/manutech.v13i02.158

Abstract

The wire drawing process is a metal forming technique. The factor affecting the final result of the draw is Lubricants. The value of the friction coefficient will have an impact on the surface quality of the wire, the use of lubricants is needed to reduce the load and surface defects of the wire. The purpose of this study was to determine the effect of lubrication on the flow stress and pulling force of AISI 1006. The lubricants used in this study have different friction coefficient values, including 0.03; 0.02 and 0.01. In this research, the method used Finite Element Method and Ansys workbench 19.0. Finite element method is done by simulating wire drawing with a die angle of 12 degrees. The results obtained will be calculated theoretically and simulated, for lubricants with different coefficient of friction have different values of flow stress and pulling force which can affect mechanical properties. The smaller the friction coefficient, the greater of the average flow stress, the percentage of theoretical calculations and simulations is 2.45%, for the effect of lubrication on the wire pulling force, the percentage is 23.25%.
Application of Organic Inhibitors to the Corrosion of Materials AISI 1070 Steel Destri Muliastri; Devi Eka Septiyani; Naufal Afif; Vania Tingting Sirenden; Januar Nur Rohmah Suprihartini
Jurnal Internasional Penelitian Teknologi Terapan Vol 2 No 1 (2021): April 2021
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v2i1.39

Abstract

AISI 1070 steel is a material that has corrosion when it reacts with the environment. One way to inhibit the corrosion rate is by using organic inhibitors. The organic inhibitors used mango leaves and mango rinds with variations in the concentration of organic inhibitors of 0%, 6%, and 8%, respectively. This study aimed to determine the effectiveness of mango leaf extract and mango rinds as an inhibitor against the corrosion rate of AISI 1070 Steel. The extraction was carried out using the Maceration Method. Fourier Transform Infrared (FTIR), Potenzyodinamic, and Weight Loss tests were carried out in this study. FTIR results show that both mango rinds and mango leaf have ingredients that were able to inhibit the corrosion rate, such as flavonoid functional groups including C – H, C = O, and C – O. Using the weight-loss method, the best corrosion rate was found in the mango rinds extract with a concentration of 8 mL, which was 31.784 mm/year with an inhibition efficiency of 92%. The highest corrosion rate was in 2M H2SO4 solution using potentiodynamic, without a mixture of inhibitors, that is 0.15589478 mm/year.
Green Corrosion Inhibitors to Head Off the Corrosion Rate of ST 37 Steels Devi Eka Septiyani Arifin; Destri Muliastri; Rudi Rudiana; Fitri Nur Indah Sari
Jurnal Internasional Penelitian Teknologi Terapan Vol 2 No 1 (2021): April 2021
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v2i1.40

Abstract

The corrosions process is a natural process and cannot be hindered, but it can be protected by adding a green inhibitor. Green corrosion inhibitors are a new alternative solution for corrosion protection because they are low-cost, biodegradable, and eco-friendly inhibitors. This research was used papaya leaves dan guava leaves extract as organic inhibitor solution by Maceration Method. The concentration of these green inhibitors is 0 mL, 1 mL, 2.5 mL, 3 mL, and 3.5 mL. The type of testing method used in this research is FTIR, PDP, and weight loss. The results show that there is Tanin function groups in papaya leaves and guava leaves extract. The potentiodynamic polarization shows the value of corrosion rate without inhibitor is 0,418 mm/year. In contrast, the corrosion rate was decreased with improving the green inhibitor as many 3.5 mL. The corrosion rate was decreased until 0,00055 mm/year, and the value of efficiency is 99,868%.
Pemanfaatan Ekstrak Abu Sekam Padi sebagai Green Inhibitor pada Baja Karbon dalam Media Air Laut Buatan DEVI EKA SEPTIYANI ARIFIN; Destri Muliastri
Manutech : Jurnal Teknologi Manufaktur Vol. 14 No. 01 (2022): Manutech: Jurnal Teknologi Manufaktur
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/manutech.v14i01.205

Abstract

Rice husk ash is a high resources of silica about 20%. Husk ash contains silica as much as 87% - 97%. One of the uses of silica is to control the occurrence of corrosion by adding a green inhibitor from rice husk ash extract. Furthermore, green inhibitors were tested for their content by FTIR. In the next step, a green inhibitor was added to 3.5% NaCl corrosive media with variations of green inhibitor 0%, 1%, 3%, 5%, and 7% and the length of immersion of  ST41 steel plate for 7 days for weight loss testing. The next process is the corrosion rate test, weight loss test and morphology test to see the depth of corrosion that occurs on the plate. The results of the FTIR test showed the presence of silica contained in the green inhibitor of rice husk ash extract. The addition of this green inhibitor causes a decrease in the corrosion rate of ST 41 Steel in a 3.5% NaCl solution. In the Potentiodynamic Polarization (PDP) test, the corrosion rate value with the addition of 5% green inhibitor’s decreased from 0,01482 mpy to 0.00319 mpy  with an inhibition efficiency value of 78,446%. Changes in the corrosion rate on the morphology of steel that had been soaked for 7 days were characterized by optical microscopy, it was seen that corrosion growth decreased with increasing concentration of green inhibitor.
Analisis Laju Korosi Pada Plat Baja Spcc dengan Pengaplikasian Sistem Proteksi Katodik Impressed Current Magfira Ayunda Salsabilla; Destri Muliastri; Dian Ratna Suminar
Prosiding Industrial Research Workshop and National Seminar Vol 13 No 01 (2022): Vol 13 (2022): Prosiding 13th Industrial Research Workshop and National Seminar
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (645.298 KB) | DOI: 10.35313/irwns.v13i01.4313

Abstract

Korosi logam merupakan masalah yang merugikan terutama aspek finansial. Baja SPCC (Steel Plate Cold Coil) digunakan oleh industri sebagai material tangki. Dalam hal ini pengendalian korosi sangat diperlukan untuk menekan laju korosi. Salah satu teknik pengendalian korosi yaitu Impressed Current Cathodic Protection (ICCP). Penelitian ini menganalisis laju korosi dan mengukur tegangan potensial korosi dengan pengaplikasian Sistem ICCP pada baja SPCC. Variasi yang digunakan dalam penelitian yaitu tegangan dan lama perendaman. Variasi tegangan yaitu 3.5 Volt, 2 Volt, dan 1.5 Volt, sedangkan variasi lama perendaman yaitu 24 jam, dan 48 jam. Pengujian laju korosi menggunakan metode weight loss dan potensiodinamik. Struktur mikro untuk melihat korosi sumuran dilakukan menggunakan mikroskop optik. Hasil pengukuran tegangan potensial menghasilkan tegangan 2 Volt berada di dalam batas potensial proteksi katodik. Pengujian metode weight loss dan potensiodinamik menghasilkan laju korosi terendah yaitu variasi 2 Volt sebesar 0,46 mmpy pada metode weight loss dan 0,0821 mmpy pada metode potensiodinamik. Semakin lama perendaman dengan ICCP laju korosi semakin cepat, sedangkan pada variasi tanpa ICCP laju korosi meningkat yaitu sebesar 0,8371 mmpy pada metode weight loss dan 0,0965 mmpy pada metode potensiodinamik. Pengamatan mikroskop menghasilkan kedalaman korosi sumuran pada variasi tanpa sistem ICCP lebih dalam dari variasi menggunakan sistem ICCP.
Peningkatan Daya Saing Remaja Masjid Desa Ciwaruga Melalui Pengenalan Teknik Instalasi LRTS Sri Utami; Bambang Puguh Manunggal; Toto Tohir; Destri Muliastri; Sapto Prajogo; Ambar Susanto
Jurnal Inovasi Pengabdian dan Pemberdayaan Masyarakat Vol 2 No 2 (2022): JIPPM - Desember 2022
Publisher : CV Firmos

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (692.812 KB) | DOI: 10.54082/jippm.38

Abstract

Penetapan peraturan ESDM Nomor 49 Tahun 2018 telah mengeluarkan peraturan terkait instalasi Pembangkit Listrik Tenaga Surya (PLTS), serta program pemerintah gerakan nasional sejuta surya atap, telah membuka peluang kerja bagi generasi muda yang belum memiliki pekerjaan. Akan tetapi untuk terlibat dalam program nasional tersebut harus memiliki kompetensi instalasi PLTS. Kabupaten Bandung Barat saat ini memiliki tingkat pengangguran yang cukup tinggi dengan jumlah pengangguran mencapai 65.000 orang. Desa Ciwaruga sebagai salah satu desa yang menjadi penyumbang jumlah pengangguran. Melalui koordinasi Remaja Masjid Jamie Babussalam dilakukan kegiatan yang bertujuan meningkatkan kompetensi agar menambah daya saing dalam mencari pekerjaan. Terkait prospek bisnis PLTS atap, maka sangat tepat jika pada kelompok remaja masjid tersebut diberikan pelatihan melalui kegiatan tentang instalasi PLTS. Metode kegiatan ini adalah pelatihan dan pembinaan Listrik Rumah Tangga Tenaga Surya (LRTS). Hasil kegiatan berupakan peningkatan skill dan pengetahuan LRTS, sertifikat serta rencana kerjasama selanjutnya dari Desa Ciwaruga dengan Tim PKM.
ANALISIS STRUKTUR MIKRO TERHADAP HASIL EKPERIMENTAL SAMBUNGAN LAS SMAW PADA BAJA KARBON ST 37 Toni Okviyanto; Dibyo Setiawan; Gugun Nugraha; Sutrimo; Destri Muliastri
MACHINERY: Jurnal Teknologi Terapan Vol. 4 No. 2 (2023): Machinery: Jurnal Teknologi Terapan
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.8049215

Abstract

Welding is a process of joining two or more metals using thermal energy to melt them. The thermal processes of welded joints affect the phase change and the physical, microstructural, and mechanical properties of the weld. The purpose of the activity, to analyze the results of SMAW welded joints, parameters of current strength, and seam angle of the ST 37 carbon steel microstructure is a continuation of previous publication activities. Variation of the current strength of 90 A, 100 A, 110 A and seam angles of 600 and 700 with electrodes Ø2.6 mm and Ø3.2 mm. During the welding process, a series of thermal cycles of the weld metal and HAZ occur, from thermalization to maximum temperature and then undergoing a cooling process. The final composition of the weld metal, filler metal, and the condition of the air in the weld area are factors for the formation of the microstructure. Microstructures such as acicular ferrite can improve the mechanical properties of the weld metal. Visualization of the microstructure using an optical microscope during the metallographic inspection process was carried out by observing the grain size and phase formed on the base metal, heat-affected zone (HAZ), fusion line (FL), and weld metal (WL). The results showed that the weld metal (WM) with a series of experiments tended to have a larger acicular ferrite structure. The conclusion of the microstructural analysis is that the greater the current strength and seam angle, the more acicular ferrite structures are formed.
Pengaruh Sudut Die Penarikan Kawat Baja AISI 1006 dengan menggunakan FEM Muliastri, Destri; Lesmana, Prayoga; Septiyani, Devi Eka
Jurnal Rekayasa Mesin Vol 17, No 2 (2022): Volume 17, Nomor 2, Agustus 2022
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v17i2.3278

Abstract

Pembuatan kawat umumnya termasuk dalam pengerjaan dingin atau coldworking yang berarti proses pengerjaan dilakukan dibawah suhu rekristalisasi dari logam tersebut, pengerjaan dingin akan mempengaruhi sifat mekanik diantaranya kekerasan, kekuatan dan keuletan. Wire drawing mampu menunjukan perubahan sifat mekanik tersebut dan parameter yang mempengaruhi ialah sudut cetakan atau die, temperatur, pelumas dan juga persentase reduksi. Metode dari penelitian ini ialah membandingkan hasil simulasi pada software Ansys Workbench 19.0 dan hasil perhitungan dengan teori yang sudah ada, dengan tujuan mengetahui pengaruh dari variasi sudut die terhadap nilai tegangan alir dan gaya penarikan. Dalam penelitian ini material wire yang digunakan ialah baja AISI 1006 ditarik melalui beberapa variasi sudut die 12º, 14º dan 16º, dengan koefisien gesek 0,03 untuk masing-masing persentase reduksi kawat 17,36%; 9,75%; dan 19,95%. Hasil yang didapat dari penelitian ini adalah rata-rata tegangan alir dan gaya penarikan. Persentase perbedaan hasil simulasi dan teoritis dari rata-rata tegangan alir dan gaya penarikan memiliki rata-rata sebesar secara berurutan 1,47% dan 8,35%, dengan nilai tegangan alir terbesar 158,508 Mpa dan gaya penarikan terbesar 502,63 N .Kata kunci: Baja AISI 1006; Finite Element Methode, Sudut die, Wire Drawing
Pengaruh Variasi Temperatur Proses Austempering Terhadap Mikrostruktur dan Sifat Mekanik Baja Armour Slamet Sutjipto; Ilham Azmy; Destri Muliastri; Devi Eka Septiyani Arifin
Manutech : Jurnal Teknologi Manufaktur Vol. 15 No. 01 (2023): Manutech: Jurnal Teknologi Manufaktur
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/manutech.v15i01.264

Abstract

Armour steel is a medium-carbon steel which is widely used in military and defense industries owing to its ability to protect from projectile and bullet pressure. However, this armour steel still posses mechanical limitation aspect, thus it is needed to engineer for improvement. Therefore, the aim of this research is to undergo mechanical properties engineering by using heat treatment method of austempering within temperature variations of 200, 250, 350, 450, and 500 oC . Experimental results show that austempering process affected to fraction quantity of phase and microstructure of ferrite, pearlite, and bainite. Armour steel resulted by austempering process in temperature 500 oC depicts microstructure transformation and mechanical properties improvement significantly. Microstructure transformation along with proportional fraction volume phases of upper bainite, ferrite, and pearlite highly beneficial to increase impact strength dan ductility of armour steel. Thereby, armour steel resulted by austempering process in temperature 500 oC has thoroughly increased its mechanical properties which capable to be applied in military and defense industries.
Analysis of Selection of Alternative Materials Outer Support Solar Water Heater Destri Muliastri; Aldi Alfares; Emsa Ayudia Putri
Jurnal Internasional Penelitian Teknologi Terapan Vol 4 No 2 (2023): October 2023
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v5i1.98

Abstract

In producing a product, the Manufacturing Industry always prioritizes safety, quality, and profit. One product that prioritizes these criteria is Outer Support on Solar Water Heaters. Currently, the material used in the outer support of the solar water heater is SS 304, the SS 304 material is considered too expensive, so the profits obtained by the manufacturing industry are very small. In addition, SS304 material from year to year is getting harder and harder to find. In this study, an analysis of the selection of alternative outer support materials for solar water heaters was carried out in order to obtain materials that can fulfill the outer support function at a relatively cheap price, do not reduce the outer support function and are easy to obtain or many on the market. The method used in this study uses the Analytical Hierarchy Process (AHP) and CES edupack software as the process of selecting materials. In this study, several tests of mechanical properties were carried out, namely tensile tests, hardness tests, and corrosion resistance tests to determine the mechanical properties of the material, and simulations of selected materials were carried out using Solidworks software, with the aim of knowing the maximum stress value and safety factor. The results obtained from this study obtained an alternative material, namely AISI 201 for the outer support. The results of the hardness test obtained the best hardness value in AISI 201 of 177.17 VHN. The results of the tensile test obtained a yield strength value of 390.35 MPa on AISI 201 material
Co-Authors Aldi Alfares Ambar Susanto Annisa Novitasari Bambang Puguh Manunggal Budi Triyono Casiman Sukardi Devi Eka Septiyani Arifin Devi Eka Septyani Dibyo Setiawan Elfiah Fadhilah Zen Emsa Ayudia Putri Febby Fauziah Fitri Nur Indah Sari Gugun Nugraha Heri Widiantoro Ilham Azmy Januar Nur Rohmah Suprihartini Kukuh Ramadhan Lenny Iryani Lesmana, Prayoga Magfira Ayunda Salsabilla Naufal Afif Prayoga Lesmana Rachmad Imbang Trittjahjono Ramadhan Ramadhan Rudi Rudiana Rudy Yuni W Sapto Prajogo Slamet Sutjipto Sri Utami Suminar, Dian Ratna Sutrimo Toni Okviyanto Toni Okviyanto Toto Tohir Vania Tingting Sirenden Waluyo Musiono Bintoro Wildan Muhammad Yun Gemilang