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All Journal Jurnal Rekayasa Mesin 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 Journal of Applied Mechanical Engineering and Renewable Energy (JAMERE) Jurnal Inovasi Pengabdian dan Pemberdayaan Masyarakat Abdimas Terapan: Jurnal Pengabdian Kepada Masyarakat Terapan
Destri Muliastri
Jurusan Teknik Mesin, Politeknik Negeri Bandung
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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.
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.
Analisis Pengaruh Annealing yang Dikombinasikan Dengan Repetitive Hammering Terhadap Nilai Kekerasan Pada Baja AISI 201 Novitasari, Annisa; Muliastri, Destri
Prosiding Industrial Research Workshop and National Seminar Vol. 14 No. 1 (2023): Vol 14 (2023): Prosiding 14th Industrial Research Workshop and National Semina
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.
Rancang Bangun Mesin Poles untuk Material Logam Eka SeptiyaniArifin, Devi; Afriansyah, Zidan; Muliastri, Destri; Azmy, Ilham; Daniel Saragih, Albert
Journal of Applied Mechanical Engineering and Renewable Energy Vol 4 No 2: August 2024
Publisher : Indonesian Society of Applied Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52158/jamere.v4i2.944

Abstract

The polishing machine is widely used as an instrument to shine or smooth the surface of an object, one of which is a specimen before and after the electroplating process. The objects polished with this machine become shinier and perfectly clean. This research includes several stages: (1) Design, (2) calculation and component selection, (3) fabrication and assembly of components, and (4) functional testing of each component. The results showed that the polishing machine can function well according to standards. The polishing machine that has been made works using electrical energy from a 1 HP 1 Phase motor with a power of 0.75 kW and a rotational speed of 2800 Rpm. It was concluded that this polishing machine had succeeded in restoring function and performance with several aspects of change which increased tool performance. The results on steel material show that corroded steel can turn clean and shiny after the sanding process is carried out with the polishing machine.
Analisis Sifat Fisik dan Mekanik terhadap Hasil Lelehan Sampah Plastik Kemasan sebagai Pengganti Bata Beton Raharja, Ahmad Syakir; Ruardhian, Mahir; Yusuf, Muhammad; Sihaloho, Nadia Fransiska; Salsabila, Zahra; Muliastri, Destri
Jurnal Rekayasa Mesin Vol. 19 No. 3 (2024): Volume 19, Nomor 3, Desember 2024
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v19i3.5815

Abstract

Indonesia merupakan negara dengan produksi sampah tertinggi kelima di dunia setelah Negara Brasil. Sampah yang tidak dapat dikelola dengan baik yaitu sampah plastik kemasan dengan jumlah sebesar 16% dari total timbulan sampah nasional. Salah satu inovasi yang dapat dilakukan yaitu dengan mendaur ulang sampah plastik menjadi Bata Beton. Bata Beton berbahan dasar plastik dapat dimanfaatkan sebagai kebutuhan lahan parkir dan konstruksi untuk pejalan kaki. Penelitian ini bertujuan untuk mengetahui seberapa besar Kekuatan Fisik dan Mekanik dari Bata Beton berbahan dasar plastik serta mengetahui kualitas bata beton berbahan dasar plastik yang dihasilkan. Metode pelelehan yang paling efektif digunakan yaitu menggunakan Pelelehan dengan kompor dua tungku. Jenis sampah yang digunakan yaitu PE (polyethylene) & PP (polypropylene) dengan variasi suhu 200 °C dan 220 °C. Pengujian yang dilakukan dalam penelitian ini yaitu Uji Ketahanan Air, Ketahanan Termal, Uji Tekan, Uji Bending, dan Uji Impak. Hasil pengujian untuk penyerapan air diperoleh daya penyerapan air paling baik yaitu sampel jenis PE (Polyethylene) pada suhu 200 °C dengan nilai penyerapan air sebesar 1,88%. Pada hasil pengujian termal yang stabil terdapat pada sampel jenis PP (polypropylene) 200 °C dan Mix 220 °C dengan nilai termal berturut-turut 336 °C ”“ 356 °C dan 339,7 °C ”“ 359,2 °C. Hasil pengujian tekan yang paling baik pada, sampel jenis PP (polypropylene) 200 °C sebesar 17,67 Mpa. Hasil pengujian bending, kekuatan bending yang paling tinggi diperoleh sebesar 24,663 MPa pada spesimen PP (polypropylene) 200 °C. Sedangkan pada hasil pengujian impak, kekuatan impak yang paling tinggi diperoleh sebesar 2,04 MPa pada spesimen PP (polypropylene) 220 °C.
Penerapan Insinerator Sampah Sederhana dalam Mengatasi Masalah Penumpukan Sampah di Desa Sariwangi Defrianto Pratama; Rahmawati Hasanah; Yunita Citra Dewi; Destri Muliastri; Devi Eka Septiyani Arifin; Muhammad Rizki Zuhri; Zainuddin Zainuddin; Ajeng Ayu Milanti; Sri Widarti
ABDIMAS TERAPAN : Jurnal Pengabdian Kepada Masyarakat Terapan Vol. 3 No. 1 (2025): Juni: ABDIMAS TERAPAN: Jurnal Pengabdian Kepada Masyarakat Terapan
Publisher : Politeknik Kampar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59061/abdimasterapan.v3i1.998

Abstract

Waste management is a major issue in Sariwangi Village, West Bandung Regency, due to the lack of public knowledge, skills, and awareness regarding technology-based waste processing. This problem is exacerbated by inadequate equipment and low community participation. To address these challenges, an incineration method was introduced through a community service program involving problem identification, literature review, awareness campaigns, waste separation, provision of equipment, and training on the use of waste processing technology. The program also developed strategies to enhance community involvement in waste management. The expected outcomes include improved knowledge and skills, availability of proper equipment, and increased awareness and participation in maintaining environmental cleanliness. This approach aims to create a cleaner, healthier, and more sustainable village environment. Keywords: Waste management; Incineration technology; Incinerator
The Influence of Full Annealing Process Combined with Repetitive Hammering on the Mechanical Properties of AISI 316 Steel Muliastri, Destri; Raharjo, Slamet
Jurnal Rekayasa Mesin Vol. 20 No. 2 (2025): Volume 20, Nomor 2, Agustus 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i2.6369

Abstract

AISI 316 steel is known for its corrosion resistance, high hardenability, and good formability. It belongs to meta-stable austenitic stainless steel, where its microstructure can transform into α-martensite under treatments like Dynamic Plastic Deformation (DPD). This steel contains 16-18% Cr and 10-14% Ni. This study aims to analyze the mechanical properties of AISI 316 steel after annealing and after combining annealing with strain hardening through repetitive hammering. The research parameters included full annealing at 1050ºC with a holding time of 30 minutes, followed by repeated hammering for 30, 60, and 90 times, and annealing at 1050ºC with repeated hammering 30 times at the same temperature. A 5 kg iron load was used during the hammering process. The tests conducted were Optical Emission Spectroscopy (OES), hardness testing using the micro vickers method, tensile testing, microstructure analysis, and calculations of strain and thickness reduction. Results showed that the untreated specimen had a hardness of 269.3 VHN, while full annealing at 1050ºC reduced it to 165.2 VHN. Combining annealing with 30, 60, and 90 hammer blows increased hardness to 213.4, 228.5, and 251.4 VHN, respectively, demonstrating the effect of repeated hammering on the mechanical properties of AISI 316 steel.
ANALISIS STRUKTUR MIKRO TERHADAP HASIL EKPERIMENTAL SAMBUNGAN LAS SMAW PADA BAJA KARBON ST 37 Okviyanto, Toni; 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.
ANALISA PENGARUH PERSENTASE REDUKSI TERHADAP STRUKTUR MIKRO DAN SIFAT MEKANIK PENARIKAN KAWAT BAJA AISI 1006 Fauziah, Febby; Muliastri, Destri; Muhammad, Wildan
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.  
PENGARUH VARIASI KUAT ARUS SMAW TERHADAP SIFAT MEKANIK BAJA AISI 1045: SMAW Current Variations Effect on Mechanical Properties of AISI 1045 Steel Muliastri, Destri; Iryani, Lenny; Setiawan, Dibyo; Ramadhan, Kukuh; Okviyanto, Toni
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.
Co-Authors Afriansyah, Zidan Ajeng Ayu Milanti Aldi Alfares Ambar Susanto Annisa Novitasari, Annisa Bambang Puguh Manunggal Bintoro, Waluyo Musiono Budi Triyono Casiman Sukardi Daniel Saragih, Albert Defrianto Pratama Devi Eka Septiyani Arifin Devi Eka Septyani Dewi, Yunita Citra Eka SeptiyaniArifin, Devi Emsa Ayudia Putri Fauziah, Febby Fitri Nur Indah Sari Gugun Nugraha Hasanah, Rahmawati Heri Widiantoro Ilham Azmy Iryani, Lenny Januar Nur Rohmah Suprihartini Lesmana, Prayoga Magfira Ayunda Salsabilla Muhammad Yusuf Muhammad, Wildan Naufal Afif Okviyanto, Toni Prayoga Lesmana Rachmad Imbang Trittjahjono Raharja, Ahmad Syakir Ramadhan Ramadhan Ramadhan, Kukuh Ruardhian, Mahir Rudi Rudiana Rudy Yuni W Sapto Prajogo setiawan, Dibyo Sihaloho, Nadia Fransiska Slamet Raharjo Slamet Sutjipto SRI UTAMI Sri Widarti Suminar, Dian Ratna Sutrimo Toto Tohir Vania Tingting Sirenden Yun Gemilang zahra salsabila Zainuddin Zainuddin Zen, Elfiah Fadhilah Zuhri, Muhammad Rizki