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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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Analisis Pengaruh Annealing yang Dikombinasikan Dengan Repetitive Hammering Terhadap Nilai Kekerasan Pada Baja AISI 201 Annisa Novitasari; Destri Muliastri
Prosiding Industrial Research Workshop and National Seminar Vol 14 No 1 (2023): Vol 14 (2023): Prosiding 14th Industrial Research Workshop and National Seminar
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/irwns.v14i1.5432

Abstract

Baja AISI 201 termasuk kedalam baja tahan karat austenitik (austenitic stainless steel) dengan kandungan Cr 16-18% dan C 0,15%. Material ini memiliki sifat mekanik yang rendah sehingga dipelukan peningkatan kekuatan pada material dengan rekayasa material. Salah satu teknik rekayasa material yang dilakukan yaitu kombinasi antara perlakuan panas dengan deformasi plastis. Penelitian ini menganalisis kekerasan dari AISI 201 yang dilakukan annealing yang dikombinasikan dengan repetitive hammering. Proses annealing dilakukan dengan temperatur 1050°C dan waktu penahanan 19 menit. Proses repetitive hammering dilakukan dengan menjatuhkan beban pada sampel secara berulang. Menggunakan beban seberat 5 Kg dengan ketinggian 1 meter, variasi pemukulan beban adalah 20 kali, 40 kali, dan 60 kali. Hasil pengujian menunjukkan bahwa nilai kekerasan meningkat seiring dengan deformasi yang diberikan. Nilai kekerasan secara berurutan yaitu 148,7 VHN ; 237,9 VHN ; 322,7 VHN ; 328,7 VHN dan 290,9 VHN. Hasil pengujian kekerasan diketahui bahwa semakin banyak jumlah variasi pukulan yang dilakukan, maka akan semakin tinggi nilai keras yang didapatkan. Hal ini dapat disebabkan karena slip line yang semakin rapat dan bertambah seiring dengan bertambahnya deformasi berupa pukulan yang diberikan. adanya twinning dan slip line dapat menghambat gerakan dislokasi sehingga meningkatkan sifat mekanik dan ketahanan korosi.
PELATIHAN SOLIDWORKS UNTUK MENINGKATKAN PENGETAHUAN MECHANICAL DESIGN ASSOCIATE PADA SISWA SMKN 2 BANDUNG Budi Triyono; Destri Muliastri; Devi Eka Septiyani A; Heri Widiantoro; Rudy Yuni W
Aptekmas Jurnal Pengabdian pada Masyarakat Vol 6 No 3 (2023): APTEKMAS Volume 6 Nomor 3 2023
Publisher : Politeknik Negeri Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36257/apts.v6i3.6145

Abstract

One of the competencies needed by technicians and engineers in the field of mechanical engineering is to be able to master software engineering in the design and design of a product. CAD (Computer Aided Design) is a computer application in design activities. Students of SMKN 2 Bandung, one of the vocational schools that has a Department of Drawing Engineering. Students of SMKN 2 Bandung already know material related to CAD but still do not know about Solidworks software, this is because there is no licensed software available at SMKN 2 Bandung. The Department of Mechanical Engineering, Politeknik Negeri Bandung, has licensed Solidworks software and provides SolidWorks certification. So based on this issue, Solidworks knowledge improvement was carried out At SMKN 2 Bandung. The purpose of this activity is to improve the competence of Human Resources and increase competitiveness, especially in the millennial generation. The training process begins with a pre-test that aims to measure the initial level of knowledge of SMKN 2 Bandung students related to Solidworks Software, then the introduction and material related to Solidworks, and at the end of the training an evaluation is carried out with a CSWA Trial Exam, and a post-test. The results of the training that has been carried out on 15 participants, show an improvement in the mastery of CAD Solidworks software.
PERANCANGAN GIRDER PADA FLEKSIBEL GANRTY CRANE KAPASITAS 1 TON Rachmad Imbang Tritjahjono; Ramadhan Ramadhan; Destri Muliastri; Casiman Sukardi; Yun Gemilang
Jurnal Teknologi Terapan Vol 9, No 2 (2023): Jurnal Teknologi Terapan
Publisher : P3M Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jtt.v9i2.610

Abstract

Lifting and transporting equipment is one of the keys to carrying out work in the manufacturing and construction industries. Due to limited access, various obstacles must be overcome in some working areas. A ganrty crane is an alternative lifting equipment that has high flexibility. This article reports the research results on the girder’s main components. This component gets direct contact with loading when lifting and rigging work is carried out. This research method was conducted by comparing manual calculation models and CAE using the Solidworkss Simulation software. From these two methods, this study yielded 23.091 and 25.54MPa for manual calculations and the finite element method, respectively. Furthermore, in the finite element method with direct contact loading, a stress of 40.52MPa is obtained. From the three stress calculations, it can be concluded that the safety factor has exceeded the requirements set out in the standard. Furthermore, utilizing the Goodman model, mitigating the possibility of fatigue failure also indicates a safe condition. Based on recent research reports, a potential self-healing is not yet possible to be recognized well especially for metals having a grain size of micron.
Pengaruh Variasi Holding Time terhadap Mikrostruktur dan Sifat Mekanik AA 6061-T6 Devi Eka Septiyani Arifin; Waluyo Musiono Bintoro; Dibyo Setiawan; Destri Muliastri; Elfiah Fadhilah Zen
JURNAL CRANKSHAFT Vol 7, No 1 (2024): Jurnal Crankshaft Vol.7 No.1 (2024)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/crankshaft.v7i1.12099

Abstract

Aluminium Alloy 6061 merupakan jenis Aluminium seri 6xxx yang memiliki sifat mekanik baik seperti ketahanan lelah, keuletan, ringan, mampu mesin, dan kemampuan bentuk yang tinggi. Akan tetapi, Aluminium Alloy memiliki kelemahan dari segi kekuatan yang lebih rendah jika dibandingkan dengan Aluminium seri 2xxx dan 7xxx. Sehingga dapat dioptimalkan, salah satunya melalui proses perlakuan panas T6. Proses ini dimulai dengan tahap solution treatment pada suhu 540°C selama 1 jam dan quenching menggunakan air. Selanjutnya, dilakukan artificial aging pada suhu 165°C dengan variasi waktu penahanan 1 jam, 3 jam, 5 jam, dan 7 jam. Penelitian ini bertujuan untuk mengamati perubahan kekuatan dan kekerasan Aluminium Alloy 6061 sebelum dan setelah age hardening. Hasil penelitian menunjukkan bahwa kekuatan tarik dan kekerasan optimum tercapai pada waktu penahanan 5 jam, dengan kekuatan tarik 293,9 MPa dan kekerasan 109 HV. Namun, pada penahanan 7 jam, kekuatan tarik menurun menjadi 727,2 MPa dan kekerasan menjadi 70,2 HV.
PENGARUH VARIASI KUAT ARUS SMAW TERHADAP SIFAT MEKANIK BAJA AISI 1045 Destri Muliastri; Lenny Iryani; Dibyo Setiawan; Kukuh Ramadhan; Toni Okviyanto
Jurnal Konversi Energi dan Manufaktur Vol. 9 No. 2 (2024)
Publisher : Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JKEM.9.2.8

Abstract

This study discusses the effect of variations in the parameters of the welding process on the tensile strength and Vickers hardness tests. In general, it is widely known that in the fabrication process, welding is a very important process that is used to join two or more materials. The welding process is carried out with variations in the strength of the welding current, namely 75, 85, and 95 A. The experimental method used in this research is AISI 1045 steel material with a thickness of 6.0 mm. The results of the tensile strength test have the highest value at a current strength of 75 A which is equal to 756.642 MPa. The lowest tensile strength test results were obtained with a tensile strength of 687.608 MPa at a current strength of 95 A. specimens with variations in current strength of 95 A have the highest value in the Vickers hardness test, with a hardness value of 281.25 HV. From the research conducted it is known that as the welding current increases there is a decrease in the value of the tensile strength. The hardness value in the heat affected zone (HAZ) area of all test specimens has the highest value, while the hardness value of weld metal (WM) and base metal (BM) has almost the same hardness value.
ANALISA PENGARUH PERSENTASE REDUKSI TERHADAP STRUKTUR MIKRO DAN SIFAT MEKANIK PENARIKAN KAWAT BAJA AISI 1006 Febby Fauziah; Destri Muliastri; Wildan Muhammad
MACHINERY: Jurnal Teknologi Terapan Vol. 5 No. 1 (2024): Machinery: Jurnal Teknologi Terapan
Publisher : Politeknik Negeri Sriwijaya, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.10728881

Abstract

The wire drawing process is a metal forming process by pulling the wire bar through the dies by a tensile force. The purpose of this process is to reduce the diameter of the wire rod without reducing volume and mass. The material used in this study was AISI 1006. The percentage of reduction is 22.14%, 17.35%, and 14.26%. The microhardness of these wires was tested using Microhardness Vickers Method, the result is 37.6433 HV, 37.7666 HV, and 38.6233 HV respectively. The maximum tensile strength value of the wires is 197.8146 MPa, 111.271 MPa, and 71.005 MPa, while the yield strength is found to be 176.379 MPa, 100.926 MPa, and 64.593 MPa. With a greater percentage of reduction on the wire, the microstructure became elongated, flatter, and much denser.  
The Characterization of Mechanical and Chemical Properties of Recycled Styrofoam Waste Employing Extrusion Process Budi Triyono; Destri Muliastri; Devi Eka Septiyani Arifin
Jurnal Rekayasa Mesin Vol 18, No 2 (2023): Volume 18, Nomor 2, Agustus 2023
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v18i2.4615

Abstract

Styrofoam waste is a polystyrene plastic-based waste in the form of foam with low density. Scavengers or recyclers are not interested in receiving styrofoam waste because of its light density which makes it ineffective in transportation and storage. Styrofoam waste can actually be converted into solid polystyrene products through a thermal-extrusion process but data regarding the optimum operating temperature and the characteristics of the resulting solid polystyrene products are not yet available. The purpose of this study was to investigate the properties of solid polystyrene products resulting from recycled styrofoam waste and determine the optimum temperature of the thermal-extrusion treatment process to be compared with the characteristics of the original polystyrene based on the results of tensile and impact tests. In this study, the processing was carried out using the thermal-extrusion method; Styrofoam is melted and extruded into a mold to produce polystyrene solids. The research was carried out with variations in extrusion temperature at 180°C, 200°C, and 220°C. The polystyrene solids are then molded into tensile and impact test specimens by injection molding. The results showed that the optimal extrusion temperature was 200°C with tensile and impact strength values of 27.55 MPa and 1,069 j/m2, respectively. Compared to the original polystyrene, the tensile strength value is 25.3% lower and the impact strength value is 29.5% lower. The decrease in the tensile and impact strength values is due to the shortening of the molecular bonds in the recycled polystyrene during the thermal-extrusion treatment process. Even though the tensile strength and impact are still lower, the use of styrofoam waste using the thermal-extrusion method has the potential to be developed at the production and commercialization stage because the resulting product has good economic value and can also reduce the use of original polystyrene and at the same time can solve the problem of styrofoam waste.
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